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  • Real-time in situ magnetic measurement of the intracellular biodegradation of iron oxide nanoparticles in a stem cell-spheroid tissue model
    Nano Res. (IF 8.515) Pub Date : 2020-01-18
    Aurore Van de Walle, Alexandre Fromain, Anouchka Plan Sangnier, Alberto Curcio, Luc Lenglet, Laurence Motte, Yoann Lalatonne, Claire Wilhelm

    Abstract The use of magnetic nanoparticles in nanomedicine keeps expanding and, for most applications, the nanoparticles are internalized in cells then left within, bringing the need for accurate, fast, and easy to handle methodologies to assess their behavior in the cellular environment. Herein, a benchtop-size magnetic sensor is introduced to provide real-time precise measurement of nanoparticle magnetism within living cells. The values obtained with the sensor, of cells loaded with different doses of magnetic nanoparticles, are first compared to conventional vibrating sample magnetometry (VSM), and a strong correlation remarkably validates the use of the magnetic sensor as magnetometer to determine the nanoparticle cellular uptake. The sensor is then used to monitor the progressive intracellular degradation of the nanoparticles, over days. Importantly, this real-time in situ measure is performed on a stem cell-spheroid tissue model and can run continuously on a same spheroid, with cells kept alive within. Besides, such continuous magnetic measurement of cell magnetism at the tissue scale does not impact either tissue formation, viability, or stem cell function, including differentiation and extracellular matrix production.

    更新日期:2020-01-21
  • Bio-inspired micro/nanostructures for flexible and stretchable electronics
    Nano Res. (IF 8.515) Pub Date : 2020-01-18
    Hongbian Li, Suye Lv, Ying Fang

    Abstract The remarkable ability of biological systems to sense and adapt to complex environmental conditions has inspired the design of next-generation electronics with advanced functionalities. This review focuses on emerging bio-inspired strategies for the development of flexible and stretchable electronics that can accommodate mechanical deformations and integrate seamlessly with biological systems. We will provide an overview of the practical considerations in the materials and structure designs of flexible and stretchable electronics. Recent progress in bio-inspired pressure/strain sensors, stretchable electrodes, mesh electronics, and flexible energy devices are then discussed, with an emphasis on their unconventional micro/nanostructure designs and advanced functionalities. Finally, current challenges and future perspectives are identified and discussed.

    更新日期:2020-01-21
  • Emerging wet electrohydrodynamic approaches for versatile bioactive 3D interfaces
    Nano Res. (IF 8.515) Pub Date : 2020-01-18
    Mehmet Berat Taskin, Lasse Hyldgaard Klausen, Mingdong Dong, Menglin Chen

    Abstract There is a compelling need for delicate nanomaterial design with various intricate functions and applications. Electrohydrodynamics applies electrostatic force to overcome the surface tension of a. liquid jet, shrinking the jet through intrinsic jetting instability into submicron fibers or spheres, with versatility from a. huge selection of materials, feasibility of extracellular matrix structure mimicry and multi-compartmentalization for tissue engineering and drug delivery. The process typically involves the collection and drying of fibers at a. solid substrate, but the introduction of a. liquid phase collection by replacing the solid collector with a. coagulation bath can introduce a. variety of new opportunities for both chemical and physical functionalizations in one single step. The so-called wet electrohydrodynamics is an emerging technique that enables a. facile, homogeneous functionalization of the intrinsic large surface area of the submicron fibers/spheres. With a. thorough literature sweep, we herein highlight the three main engineering features integrated through the single step wet electrospinning process in terms of creating functional biomaterials: (i) The fabrication of 3D macrostructures, (ii) in situ chemical functionalization, and (iii) tunable nano-topography. Through an emerging technique, wet electrohydrodynamics has demonstrated a. great potential in interdisciplinary research for the development of functional 3D interfaces and materials with pertinent applications in all fields where secondary structured, functional surface is desired. Among these, engineered biomaterials bridging materials science with biology have already shown particular potential.

    更新日期:2020-01-21
  • Long-term live-cell microscopy with labeled nanobodies delivered by laser-induced photoporation
    Nano Res. (IF 8.515) Pub Date : 2020-01-17
    Jing Liu, Tim Hebbrecht, Toon Brans, Eef Parthoens, Saskia Lippens, Chengnan Li, Herlinde De Keersmaecker, Winnok H. De Vos, Stefaan C. De Smedt, Rabah Boukherroub, Jan Gettemans, Ranhua Xiong, Kevin Braeckmans

    Abstract Fluorescence microscopy is the method of choice for studying intracellular dynamics. However, its success depends on the availability of specific and stable markers. A prominent example of markers that are rapidly gaining interest are nanobodies (Nbs, ~ 15 kDa), which can be functionalized with bright and photostable organic fluorophores. Due to their relatively small size and high specificity, Nbs offer great potential for high-quality long-term subcellular imaging, but suffer from the fact that they cannot spontaneously cross the plasma membrane of live cells. We have recently discovered that laser-induced photoporation is well suited to deliver extrinsic labels to living cells without compromising their viability. Being a laser-based technology, it is readily compatible with light microscopy and the typical cell recipients used for that. Spurred by these promising initial results, we demonstrate here for the first time successful long-term imaging of specific subcellular structures with labeled nanobodies in living cells. We illustrate this using Nbs that target GFP/YFP-protein constructs accessible in the cytoplasm, actin-bundling protein Fascin, and the histone H2A/H2B heterodimers. With an efficiency of more than 80% labeled cells and minimal toxicity (∼ 2%), photoporation proved to be an excellent intracellular delivery method for Nbs. Time-lapse microscopy revealed that cell division rate and migration remained unaffected, confirming excellent cell viability and functionality. We conclude that laser-induced photoporation labeled Nbs can be easily delivered into living cells, laying the foundation for further development of a broad range of Nbs with intracellular targets as a toolbox for long-term live-cell microscopy.

    更新日期:2020-01-17
  • A non-rigid shift of band dispersions induced by Cu intercalation in 2H-TaSe 2
    Nano Res. (IF 8.515) Pub Date : 2020-01-17
    Pengdong Wang, Rashid Khan, Zhanfeng Liu, Bo Zhang, Yuliang Li, Sheng Wang, Yunbo Wu, Hongen Zhu, Yi Liu, Guobin Zhang, Dayong Liu, Shuangming Chen, Li Song, Zhe Sun

    Abstract The intercalation of metal is a promising method for the modulating electronic properties in transition metal dichalcogenides (TMDs). However, there still lacks enough knowledge about how the intercalated atoms directly impact the two-dimensional structural layers and modulate the band structures therein. Taking advantage of X-ray absorption fine structure and angle-resolved photoemission spectroscopy, we studied how Cu intercalation influences the host TaSe2 layers in Cu0.03TaSe2 crystals. The intercalated Cu atoms form bonds with Se of the host layers, and there is charge transfer from Cu to Se. By examining the changes of band dispersions, we show that the variation of electronic structures is beyond a simple rigid band model with merely charge doping effect. This work reveals that the unusual change of band dispersions is associated with the formation of bonds between the intercalated metal elements and anion ions in the host layers, and provides a reference for the comprehensive understanding of the electronic structures in intercalated materials.

    更新日期:2020-01-17
  • In situ fluorinated solid electrolyte interphase towards long-life lithium metal anodes
    Nano Res. (IF 8.515) Pub Date : 2020-01-17
    Shan-Min Xu, Hui Duan, Ji-Lei Shi, Tong-Tong Zuo, Xin-Cheng Hu, Shuang-Yan Lang, Min Yan, Jia-Yan Liang, Yu-Guo Yang, Qing-Hua Kong, Xing Zhang, Yu-Guo Guo

    Abstract The urgent demands for high-energy-density rechargeable batteries promote a flourishing development of Li metal anode. However, the uncontrollable dendrites growth and serious side reactions severely limit its commercial application. Herein, an artificial LiF-rich solid electrolyte interphase (SEI) is constructed at molecular-level using one-step photopolymerization of hexafluorobutyl acrylate based solution, where the LiF is in situ generated during photopolymerization process (denoted as PHALF). The LiF-rich layer comprised flexible polymer matrix and inorganic LiF filler not only ensures intimate contact with Li anode and adapts volume fluctuations during cycling but also regulates Li deposition behavior, enabling it to suppress the dendrite growth and block side reactions between the electrolyte and Li metal. Accordingly, the PHALF-Li anode presents superior stable cycling performance over 500 h at 1 mA·cm−2 for 1 mA·h·cm−2 without dendrites growth in carbonate electrolyte. The work provides a novel approach to design and build in situ artificial SEI layer for high-safety and stable Li metal anodes.

    更新日期:2020-01-17
  • Direct optical-structure correlation in atomically thin dichalcogenides and heterostructures
    Nano Res. (IF 8.515) Pub Date : 2020-01-17
    Akshay Singh, Hae Yeon Lee, Silvija Gradečak

    Abstract Atomically thin transition metal dichalcogenides (TMDs) have distinct opto-electronic properties including enhanced luminescence and high on-off current ratios, which can be further modulated by making more complex TMD heterostructures. However, resolution limits of conventional optical methods do not allow for direct nanoscale optical-structural correlation measurements in these materials, particularly of buried interfaces in TMD heterostructures. Here we use, for the first time, electron beam induced cathodoluminescence in a scanning transmission electron microscope (CL-STEM) to measure optical properties of monolayer TMDs (WS2, MoS2 and WSSe alloy) encapsulated between layers of hBN. We observe dark areas resulting from localized (∼ 100 nm) imperfect interfaces and monolayer folding, which shows that the intimate contact between layers in this application-relevant heterostructure is required for proper inter layer coupling. We also realize a suitable imaging method that minimizes electron-beam induced changes and provides measurement of intrinsic properties. To overcome the limitation of small electron interaction volume in TMD monolayer (and hence low photon yield), we find that encapsulation of TMD monolayers with hBN and subsequent annealing is important. CL-STEM offers to be a powerful method to directly measure structure-optical correspondence in lateral or vertical heterostructures and alloys.

    更新日期:2020-01-17
  • Nanoscale resistive switching devices for memory and computing applications
    Nano Res. (IF 8.515) Pub Date : 2020-01-17
    Seung Hwan Lee, Xiaojian Zhu, Wei D. Lu

    With the slowing down of the Moore’s law and fundamental limitations due to the von-Neumann bottleneck, continued improvements in computing hardware performance become increasingly more challenging. Resistive switching (RS) devices are being extensively studied as promising candidates for next generation memory and computing applications due to their fast switching speed, excellent endurance and retention, and scaling and three-dimensional (3D) stacking capability. In particular, RS devices offer the potential to natively emulate the functions and structures of synapses and neurons, allowing them to efficiently implement neural networks (NNs) and other in-memory computing systems for data intensive applications such as machine learning tasks. In this review, we will examine the mechanisms of RS effects and discuss recent progresses in the application of RS devices for memory, deep learning accelerator, and more faithful brain-inspired computing tasks. Challenges and possible solutions at the device, algorithm, and system levels will also be discussed.

    更新日期:2020-01-17
  • 更新日期:2020-01-17
  • Hydrogel-based artificial enzyme for combating bacteria and accelerating wound healing
    Nano Res. (IF 8.515) Pub Date : 2020-01-17
    Hao Qiu, Fang Pu, Zhengwei Liu, Xuemeng Liu, Kai Dong, Chaoqun Liu, Jinsong Ren, Xiaogang Qu

    Abstract Artificial enzymes have provided great antimicrobial activity to combat wound infection. However, the lack of tissue repair capability compromised their treatment effect. Therefore, development of novel artificial enzyme concurrently with the excellent antibacterial activity and the property of promoting wound healing are required. Here, we demonstrated the hydrogel-based artificial enzyme composed of copper and amino acids possessed intrinsic peroxidase-like catalytic activity, which could combat wound pathogen effectively and accelerate wound healing by stimulating angiogenesis and collagen deposition. Furthermore, the system possesses good biocompatibility for practical application. The synergic effect of the hydrogel-based artificial enzyme promises the system as a new paradigm in bacteria-infected wound healing therapy.

    更新日期:2020-01-17
  • Activating proper inflammation for wound-healing acceleration via mesoporous silica nanoparticle tissue adhesive
    Nano Res. (IF 8.515) Pub Date : 2020-01-17
    Zhao Pan, Kai-Run Zhang, Huai-Ling Gao, Yong Zhou, Bei-Bei Yan, Chi Yang, Zhi-yuan Zhang, Liang Dong, Si-Ming Chen, Rui Xu, Duo-Hong Zou, Shu-Hong Yu

    Efficient initiation and resolution of inflammation are crucial for wound repair. However, with using tissue adhesives for wound repair, patients occasionally suffered from delayed healing process because slow elimination of those exogenous adhesives generally leads to chronic inflammation. As the demand for minimal invasive therapy continues to rise, desire for adhesive materials that can effectively reconnect surgical gaps and promote wound regeneration becomes increasingly urgent. Herein, by exploiting the inherent porous structure and performance of adhesion to tissue of mesoporous silica nanoparticles (MSNs), we demonstrate a tissue adhesive that can elicit acute inflammatory response and get eliminated after tissue reformation. With formation of nanocomposites in wound gaps, the injured tissues can get reconnected conveniently. The resultant accelerated healing process verify that the strategy of exploiting unique properties of nanomaterials can effectively promote inflammation resolution and wound repair. This design strategy will inspire more innovative tissue adhesives for clinical applications.

    更新日期:2020-01-17
  • Erratum to: Novel fibronectin-targeted nanodisk drug delivery system displayed superior efficacy against prostate cancer compared with nanospheres
    Nano Res. (IF 8.515) Pub Date : 2020-01-16
    Luyao Wang, Bingjie Zhou, Shiqi Huang, Mengke Qu, Qing Lin, Tao Gong, Yuan Huang, Xun Sun, Qin He, Zhirong Zhang, Ling Zhang

    The description of nanodisk and nanosphere for their composing proportion in page 2, Section 2.2 of the original version of this article was unfortunately reversed.

    更新日期:2020-01-17
  • Boosting electrocatalytic water splitting via metal-metalloid combined modulation in quaternary Ni-Fe-P-B amorphous compound
    Nano Res. (IF 8.515) Pub Date : 2020-01-16
    Wukui Tang, Xiaofang Liu, Ya Li, Yanhui Pu, Yao Lu, Zhiming Song, Qiang Wang, Ronghai Yu, Jianglan Shui

    Design and synthesis of highly efficient and cost-effective bifunctional catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) remain a big challenge. Herein, a quaternary amorphous nanocompound Ni-Fe-P-B has been synthesized by a facile, scalable co-reduction method. The Ni-Fe-P-B exhibits high electrocatalytic activity and outstanding durability for both HER and OER, delivering a current density of 10 mAcm−2 at overpotentials of 220 and 269 mV, respectively. When loaded on carbon fiber paper (CFP) as a bifunctional catalyst, the Ni-Fe-P-B@CFP electrode requires a low cell voltage of 1.58 V to obtain 10 mAcm−2 for overall water splitting with negligible recession over 60 h. The excellent catalytic performances of Ni-Fe-P-B mainly benefit from the metal-metalloid combined composition modulation and the unique amorphous structure. This work provides new insights into the design of robust bifunctional catalysts for water splitting, and may promote the development of multicomponent amorphous catalysts.

    更新日期:2020-01-16
  • Excipient-free porphyrin/SN-38 based nanotheranostics for drug delivery and cell imaging
    Nano Res. (IF 8.515) Pub Date : 2020-01-16
    Ye Yuan, Ruonan Bo, Di Jing, Zhao Ma, Zhongling Wang, Tzu-yin Lin, Lijie Dong, Xiangdong Xue, Yuanpei Li

    Nanotheranostics with comprehensive diagnostic and therapeutic capabilities show exciting cancer treatment potentials. Here, we develop an excipient-free drug delivery system for cancer diagnosis as well as therapy, in which a near infra-red photosensitizer and a chemotherapeutic drug can be self-delivered without any carriers. The building block of the drug delivery system was synthesized by covalently conjugating four anticancer drugs (7-ethyl-10-hydroxy-camptothecin, SN-38) with a photosensitizer (porphyrin) via hydrolyzable ester linkage, which endows the drug delivery system with 100% active pharmaceutical ingredients, excellent imaging, and therapeutic functionalities. The conjugates can readily self-assemble into nanosheets (PS NSs) and remain stable for at least 20 days in aqueous solution. In PS NSs, fluorescence resonance energy transfer (FRET) dominates the fluorescence of SN-38 and enables to monitor the drug release fluorescently. The PS NSs also show excellent anticancer activity in vitro, due to the increased cell uptake with the synergistic effect of photodynamic therapy and chemotherapy.

    更新日期:2020-01-16
  • Micro or nano: Evaluation of biosafety and biopotency of magnesium metal organic framework-74 with different particle sizes
    Nano Res. (IF 8.515) Pub Date : 2020-01-16
    Zhou Zhu, Shaokang Jiang, Yanhua Liu, Xiaomeng Gao, Shanshan Hu, Xin Zhang, Chao Huang, Qianbing Wan, Jian Wang, Xibo Pei

    None

    更新日期:2020-01-16
  • Phosphorus-doping activates carbon nanotubes for efficient electroreduction of nitrogen to ammonia
    Nano Res. (IF 8.515) Pub Date : 2020-01-15
    Lu-Pan Yuan, Ze-Yuan Wu, Wen-Jie Jiang, Tang Tang, Shuai Niu, Jin-Song Hu

    None

    更新日期:2020-01-15
  • Multiaxial electrospun generation of hollow graphene aerogel spheres for broadband high-performance microwave absorption
    Nano Res. (IF 8.515) Pub Date : 2020-01-15
    Tian Li, Dandan Zhi, Yao Chen, Bing Li, Zuowan Zhou, Fanbin Meng

    Abstract Although graphene aerogels (GA) have been attracted great attention, the easy-operation and large-scale production of GA are still challenges. Further, most GA have a monolith-like appearance, limiting their application-specific needs. Herein, we highlight graphene aerogel spheres with controllable hollow structures (HGAS) that are delicately designed and manufactured via coaxial electrospinning coupled with freeze-drying and calcination. The HGAS exhibit a spherical configuration at the macroscale, while the construction elements of graphene on the microscale showing an interconnected radial microchannel structure. Further, ball-in-ball graphene aerogel spheres (BGAS) are obtained by reference to the triaxial electrospinning technology. The as-prepared spheres possess the controllable integrated conductive networks, leading to the effective dielectric loss and impedance matching, thus bringing on high-performance microwave absorption. The as-obtained HGAS shows a minimum reflection loss of -52.7 dB, and a broad effective absorption bandwidth (fE) of 7.0 GHz with thickness of 2.3 mm. Further, the fE reaches 9.3 GHz for BGAS with thickness of 3.4 mm. Aforementioned superior microwave absorption of HGAS and BGAS confirms combination of multiaxial electrospinning and freeze-drying on the multiscale is an effective strategy for scalable fabrication of advanced microwave absorbing functional graphene aerogel spheres.

    更新日期:2020-01-15
  • Temperature- and thickness-dependence of robust out-of-plane ferroelectricity in CVD grown ultrathin van der Waals α-In 2 Se 3 layers
    Nano Res. (IF 8.515) Pub Date : 2020-01-15
    Weng Fu Io, Shuoguo Yuan, Sin Yi Pang, Lok Wing Wong, Jiong Zhao, Jianhua Hao

    None

    更新日期:2020-01-15
  • Erratum to: Carbon nanostructure morphology templates nanocomposites for phosphoproteomics
    Nano Res. (IF 8.515) Pub Date : 2020-01-14
    Susy Piovesana, Daniel Iglesias, Manuel Melle-Franco, Slavko Kralj, Chiara Cavaliere, Michele Melchionna, Aldo Laganà, Anna L. Capriotti, Silvia Marchesan

    The fourth author’s name was unfortunately misspelled on the first page and the first page of the ESM. Instead of Susy Piovesana1, Daniel Iglesias2, Manuel Melle-Franco3, Slavo Kralj4, Chiara Cavaliere1, Michele Melchionna2, Aldo Laganà1,5, Anna L. Capriotti1 (✉), and Silvia Marchesan2 (✉) It should read Susy Piovesana1, Daniel Iglesias2, Manuel Melle-Franco3, Slavko Kralj4, Chiara Cavaliere1, Michele Melchionna2, Aldo Laganà1,5, Anna L. Capriotti1 (✉), and Silvia Marchesan2 (✉)

    更新日期:2020-01-14
  • Revealing the anion intercalation behavior and surface evolution of graphite in dual-ion batteries via in situ AFM
    Nano Res. (IF 8.515) Pub Date : 2020-01-13
    Kai Yang, Langlang Jia, Xinhua Liu, Zijian Wang, Yan Wang, Yiwei Li, Haibiao Chen, Billy Wu, Luyi Yang, Feng Pan

    Abstract Graphite as a positive electrode material of dual ion batteries (DIBs) has attracted tremendous attentions for its advantages including low lost, high working voltage and high energy density. However, very few literatures regarding to the real-time observation of anion intercalation behavior and surface evolution of graphite in DIBs have been reported. Herein, we use in situ atomic force microscope (AFM) to directly observe the intercalation/de-intercalation processes of PF6− in graphite in real time. First, by measuring the change in the distance between graphene layers during intercalation, we found that PF6− intercalates in one of every three graphite layers and the intercalation speed is measured to be 2 µm·min−1. Second, graphite will wrinkle and suffer structural damages at high voltages, along with severe electrolyte decomposition on the surface. These findings provide useful information for further optimizing the capacity and the stability of graphite anode in DIBs.

    更新日期:2020-01-13
  • Hierarchical coupling effect in hollow Ni/NiFe 2 O 4 -CNTs microsphere via spray-drying for enhanced oxygen evolution electrocatalysis
    Nano Res. (IF 8.515) Pub Date : 2020-01-13
    Xuefeng Yu, Guanyu Chen, Yizhe Wang, Jiwei Liu, Ke Pei, Yunhao Zhao, Wenbin You, Lei Wang, Jie Zhang, Linshen Xing, Jingjun Ding, Guangzhou Ding, Min Wang, Renchao Che

    Design and fabrication of cost-effective transition metal and their oxides-based nanocomposites are of paramount significance for metal-air batteries and water-splitting. However, the traditional optimized designs for nanostructure are complicated, low-efficient and underperform for wide-scale applications. Herein, a novel hierarchical framework of hollow Ni/NiFe2O4-CNTs composite microsphere forcibly-assembled by zero-dimensional (0D) Ni/NiFe2O4 nanoparticle (< 16 nm) and one-dimensional (1D) self-supporting CNTs was fabricated successfully. Benefitted from the unique nanostructure, such monohybrids can achieve remarkable oxygen evolution reaction (OER) performance in alkaline media with a low overpotential and superior durability, which exceeds most of the commercial catalysts based on IrO2/RuO2 or other non-noble metal nanomaterials. The enhanced OER performance of Ni/NiFe2O4-CNTs composite is mainly ascribed to the increased catalytic activity and the optimized conductivity induced by the effects of strong hierarchical coupling and charge transfers between CNTs and Ni/NiFe2O4 nanoparticles. These effects are greatly boosted by the polarized heterojunction interfaces confirmed by electron holography. The density functional theory (DFT) calculation indicates the epitaxial Ni further enriches the intrinsic electrons contents of NiFe2O4 and thus accelerates absorption/desorption kinetics of OER intermediates. This work hereby paves a facile route to construct the hollow composite microsphere with excellent OER electrocatalytic activity based on non-noble metal oxide/CNTs.

    更新日期:2020-01-13
  • Graphene oxide as a photocatalytic nuclease mimicking nanozyme for DNA cleavage
    Nano Res. (IF 8.515) Pub Date : 2020-01-10
    Jinyi Zhang, Shihong Wu, Lingzi Ma, Peng Wu, Juewen Liu

    Abstract Developing nanomaterial-based enzyme mimics for DNA cleavage is an interesting challenge and it has many potential applications. Single-layered graphene oxide (GO) is an excellent platform for DNA adsorption. In addition, GO has been employed for photosensitized generation of reactive oxygen species (ROS). Herein, we demonstrate that GO sheets could cleave DNA as a nuclease mimicking nanozyme in the presence of UV or blue light. For various DNA sequences and lengths, well-defined product bands were observed along with photobleaching of the fluorophore label on the DNA. Different from previously reported GO cleavage of DNA, our method did not require metal ions such as Cu2+. Fluorescence spectroscopy suggested a high adsorption affinity between GO and DNA. For comparison, although zero-dimensional fluorescent carbon dots (C-dots) had higher photosensitivity in terms of producing ROS, their cleavage activity was much lower and only smeared cleavage products were observed, indicating that the ROS acted on the DNA in solution. Based on the results, GO behaved like a classic heterogeneous catalyst following substrate adsorption, reaction, and product desorption steps. This simple strategy may help in the design of new nanozymes by introducing light.

    更新日期:2020-01-10
  • Silver nanoparticles-decorated and mesoporous silica coated single-walled carbon nanotubes with an enhanced antibacterial activity for killing drug-resistant bacteria
    Nano Res. (IF 8.515) Pub Date : 2020-01-08
    Yu Zhu, Jia Xu, Yanmao Wang, Cang Chen, Hongchen Gu, Yimin Chai, Yao Wang

    Abstract The mounting threat of antibiotic-resistant bacterial infections has made it imperative to develop innovative antibacterial strategies. Here we propose a novel antibacterial nanoplatform of silver nanoparticles-decorated and mesoporous silica coated single-walled carbon nanotubes constructed via a N-[3-(trimethoxysilyl)propyl]ethylene diamine (TSD)-mediated method (SWCNTs@mSiO2-TSD@Ag). In this system, the outer mesoporous silica shells are able to improve the dispersibility of SWCNTs, which will increase their contact area with bacteria cell walls. Meanwhile, the large number of mesopores in silica layers act as microreactors for in situ synthesis of Ag NPs with controlled small size and uniform distribution, which induces an enhanced antibacterial activity. Compared with TSD modified mesoporous silica coated single-walled carbon nanotubes (SWCNTs@mSiO2-TSD) and commercial Ag NPs, this combination nanosystem of SWCNTs@mSiO2-TSD@Ag exhibits much stronger antibacterial performance against multi-drug-resistant bacteria Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) in vitro through damaging the bacterial cell membranes and a fast release of silver ions. Furthermore, the in vivo rat skin infection model verifies that SWCNTs@mSiO2-TSD@Ag have remarkably improved abilities of bacterial clearance, wound healing promoting as well as outstanding biocompatibility. Therefore, this novel nanoplatform indicates promising potentials as a safe and powerful tool for the treatment of clinical drug-resistant infections.

    更新日期:2020-01-08
  • Thickness-dependent wrinkling of PDMS films for programmable mechanochromic responses
    Nano Res. (IF 8.515) Pub Date : 2020-01-06
    Zhiwei Li, Yun Liu, Melinda Marin, Yadong Yin

    Abstract We report a remarkable thickness-dependent wrinkling behavior of oxygen plasma-treated polydimethylsiloxane (PDMS) films, in which an energy barrier separates the wrinkling mechanics into two regimes. For thick films, the film wrinkles with a constant periodicity which can be precisely predicted by the classic nonlinear finite mechanics. Reducing the film thickness below 1 mm leads to nonuniform wrinkles with an increasing periodicity which gives rise to random scattering and transparency changes under mechanical strains. By tuning the film thickness, we were able to control both the quality and size of the periodic wrinkles and further design mechanochromic devices featuring brilliant structural colors and programmable colorimetric responses. This work sheds light on the fundamental understanding of the wrinkling mechanics of bilayer systems and their intriguing mechanochromic applications.

    更新日期:2020-01-08
  • VO 2 ·0.2H 2 O nanocuboids anchored onto graphene sheets as the cathode material for ultrahigh capacity aqueous zinc ion batteries
    Nano Res. (IF 8.515) Pub Date : 2020-01-03
    Dedong Jia, Kun Zheng, Ming Song, Hua Tan, Aitang Zhang, Lihua Wang, Lijun Yue, Da Li, Chenwei Li, Jingquan Liu

    Abstract Aqueous Zinc-ion batteries (ZIBs), using zinc negative electrode and aqueous electrolyte, have attracted great attention in energy storage field due to the reliable safety and low-cost. A composite material comprised of VO2·0.2H2O nanocuboids anchored on graphene sheets (VOG) is synthesized through a facile and efficient microwave-assisted solvothermal strategy and is used as aqueous ZIBs cathode material. Owing to the synergistic effects between the high conductivity of graphene sheets and the desirable structural features of VO2·0.2H2O nanocuboids, the VOG electrode has excellent electronic and ionic transport ability, resulting in superior Zn ions storage performance. The Zn/VOG system delivers ultrahigh specific capacity of 423 mAh·g−1 at 0.25 A·g−1 and exhibits good cycling stability of up to 1,000 cycles at 8 A·g−1 with 87% capacity retention. Systematical structural and elemental characterizations confirm that the interlayer space of VO2·0.2H2O nanocuboids can adapt to the reversible Zn ions insertion/extraction. The as-prepared VOG composite is a promising cathode material with remarkable electrochemical performance for low-cost and safe aqueous rechargeable ZIBs.

    更新日期:2020-01-04
  • Metal-organic frameworks nanoswitch: Toward photo-controllable endo/lysosomal rupture and release for enhanced cancer RNA interference
    Nano Res. (IF 8.515) Pub Date : 2020-01-03
    Gan Lin, Yang Zhang, Long Zhang, Junqing Wang, Ye Tian, Wen Cai, Shangui Tang, Chengchao Chu, JiaJing Zhou, Peng Mi, Xiaoyuan Chen, Gang Liu

    Endo/lysosomal escape and gene release are two critical bottlenecks in gene delivery. Herein, a novel photo-controllable metal-organic frameworks (MOFs) nanoswitch is rationally designed for enhancing small interfering RNA (siRNA) delivery. One single laser triggers the “off-to-on” switching of MOFs nanocomplexes, inducing significant siRNA release accompanied by rapid MOFs dissociation into protonatable 2-methylimidazalo and osmotic rupturing Zn2+ ions, which cooperatively contribute to remarkable endo/lysosomal rupture (∼ 90%). The simultaneous endo/lysosomal rupture and release enable a high spatio-temporal control on RNA interference for effective cancer therapy. Notably, the “off-to-on” switching also activates fluorescence recovery for real-time monitoring siRNA delivery. The nanoswitch could easily be extended to deliver other therapeutic agents (e.g., DNA, protein, anticancer drug) for overcoming endo/lysosomal entrapment.

    更新日期:2020-01-04
  • Carbon nanostructure morphology templates nanocomposites for phosphoproteomics
    Nano Res. (IF 8.515) Pub Date : 2020-01-03
    Susy Piovesana, Daniel Iglesias, Manuel Melle-Franco, Slavo Kralj, Chiara Cavaliere, Michele Melchionna, Aldo Laganà, Anna L. Capriotti, Silvia Marchesan

    Abstract Protein and peptide phosphorylation regulate numerous pathological processes, however, their characterization is challenging due to their low abundance and transient nature. Therefore, nanomaterials are being developed to address this demanding task. In particular, carbon nanostructures are attracting interest as scaffolds for functional nanocomposites, yet only isolated studies exist on the topic, and little is known on the effect of nanocarbon morphology on templating nanocomposites. In this work, we compared oxidized carbon nanotubes, graphene oxide, oxidized carbon nanohorns and oxidized graphitized carbon black, as scaffolds for magnetized nanocomposites. The nanomaterials were extensively characterized with experimental and in silico techniques. Next, they were applied to phosphopeptide enrichment from cancer cell lysates for NanoHPLC-MS/MS, with selectivity as high as nearly 90% and several-thousand identification hits. Overall, new insights emerged for the understanding and the design of nanocomposites for phosphoproteomics.

    更新日期:2020-01-04
  • Porous Pt nanoframes decorated with Bi(OH) 3 as highly efficient and stable electrocatalyst for ethanol oxidation reaction
    Nano Res. (IF 8.515) Pub Date : 2020-01-03
    Xiaolei Yuan, Bei Jiang, Muhan Cao, Congyang Zhang, Xiaozhi Liu, Qinghua Zhang, Fenglei Lyu, Lin Gu, Qiao Zhang

    Abstract High-quality Pt-based catalysts are highly desirable for ethanol oxidation reaction (EOR), which is of critical importance for the commercial applications of direct ethanol fuel cells (DEFCs). However, most of the Pt-based catalysts have suffered from high cost and low operation durability. Herein a two-step method has been developed to synthesize porous Pt nanoframes decorated with Bi(OH)3, which show excellent catalytic activity and operation durability in both alkaline and acidic media. For example, the nanoframes show a mass activity of 6.87 A·mgPt−1 in alkaline media, which is 13.5-fold higher than that of commercial Pt/C. More importantly, the catalyst can be reactivated simply, which shows negligible activity loss after running for 180,000 s. Further in situ attenuated total reflection-infrared (ATR-IR) absorption spectroscopy and CO-stripping experiments indicate that surface Bi(OH)3 species can greatly facilitate the formation of adsorbed OH species and subsequently remove carbonaceous poison, resulting in a significantly enhanced stability towards EOR. This work may favor the tailoring of desired electrocatalysts with high activity and durability for future commercial application of DEFCs.

    更新日期:2020-01-04
  • NaV 6 O 15 : a promising cathode material for insertion/extraction of Mg 2+ with excellent cycling performance
    Nano Res. (IF 8.515) Pub Date : 2020-01-03
    Dongzheng Wu, Jing Zeng, Haiming Hua, Junnan Wu, Yang Yang, Jinbao Zhao

    None

    更新日期:2020-01-04
  • One-step rapid synthesis, crystal structure and 3.3 microseconds long excited-state lifetime of Pd 1 Ag 28 nanocluster
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Xinzhang Lin, Hengjiang Cong, Keju Sun, Xuemei Fu, Wanchao Kang, Xiuli Wang, Shengye Jin, Ren’an Wu, Chao Liu, Jiahui Huang

    Abstract Doping foreign atom(s) in metal nanoclusters is an effective strategy to engineer the properties and functionalities of metal nanoclusters. However, until now, to dope Pd atom into Ag nanoclusters remains a huge challenge. Here we develop a one-step rapid method to synthesize the Pd-doped Ag nanocluster with high yield. The prepared Pd1Ag28 nanocluster was characterized by mass spectroscopy, X-ray photoelectron spectroscopy, X-ray crystallography, fluorescence spectroscopy, ultraviolet–visible absorption spectroscopy and transient absorption spectroscopy. The nanocluster exhibits a perfect face-centered cubic (FCC) kernel structure with a tetrahedron-like shell. Of note, Pd1Ag28 nanocluster had an unexpectedly long excited-state lifetime of 3.3 microseconds, which is the longest excited-state lifetime for Ag-based nanoclusters so far. Meanwhile, the excellent near-infrared luminescence indicated the nanocluster has the potential in fluorescent bio-imaging. Besides, it was revealed that Pd1Ag28 nanocluster could be transformed into Au1Ag28 nanocluster via ion exchange reaction of AuPPh3Cl with Pd1Ag28 nanocluster. This work provides an efficient synthetic protocol of alloy nanoclusters and will contribute to study the effect of foreign atom on the properties of metal nanoclusters.

    更新日期:2020-01-02
  • PCN-Fe(III)-PTX nanoparticles for MRI guided high efficiency chemo-photodynamic therapy in pancreatic cancer through alleviating tumor hypoxia
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Tao Zhang, Zhenqi Jiang, Libin Chen, Chunshu Pan, Shan Sun, Chuang Liu, Zihou Li, Wenzhi Ren, Aiguo Wu, Pintong Huang

    As nanomedicine-based clinical strategies have continued to develop, the possibility of combining chemotherapy and singlet oxygen-dependent photodynamic therapy (PDT) to treat pancreatic cancer (PaC) has emerged as a viable therapeutic modality. The efficacy of such an approach, however, is likely to be constrained by the mechanisms of drug release and tumor oxygen levels. In the present study, we developed an Fe(III)-complexed porous coordination network (PCN) which we then used to encapsulate PTX (PCN-Fe(III)-PTX) nanoparticles (NPs) in order to treat PaC via a combination of chemotherapy and PDT. The resultant NPs were able to release drug in response to both laser irradiation and pH changes to promote drug accumulation within tumors. Furthermore, through a Fe(III)-based Fenton-like reaction these NPs were able to convert H2O2 in the tumor site to O2, thereby regulating local hypoxic conditions and enhancing the efficacy of PDT approaches. Also these NPs were suitable for use as a T1-MRI weighted contrast agent, making them viable for monitoring therapeutic efficacy upon treatment. Our results in both cell line and animal models of PaC suggest that these NPs represent an ideal agent for mediating effective MRI-guided chemotherapy-PDT, giving them great promise for the clinical treatment of PaC.

    更新日期:2020-01-02
  • Boride-based electrocatalysts: Emerging candidates for water splitting
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Zhijie Chen, Xiaoguang Duan, Wei Wei, Shaobin Wang, Zejie Zhang, Bing-Jie Ni

    None

    更新日期:2020-01-02
  • Embedding ultrasmall Ag nanoclusters in Luria-Bertani extract via light irradiation for enhanced antibacterial activity
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Ziping Wang, Yushuang Fang, Xianfeng Zhou, Zhibo Li, Haiguang Zhu, Fanglin Du, Xun Yuan, Qiaofeng Yao, Jianping Xie

    Ultrasmall silver nanoclusters (Ag NCs) with rich surface chemistry and good biocompatibility are promising in antibacterial application, however, further development of Ag NCs for practical settings has been constrained by their relatively weak antibacterial activity. Using the nutritionally-rich medium for bacteria (e.g., Luria-Bertani (LB) medium) to coat active Ag NCs could further improve their antibacterial activity. Here, we provide a delicate design of a highly efficient Ag NCs@ELB antibacterial agent (ELB denotes the extract of LB medium) by anchoring Ag NCs inside the ELB species via light irradiation. The as-designed Ag NCs with bacterium-favored nutrients on the surface can be easily swallowed by the bacteria, boosting the production of the intracellular reactive oxygen species (ROS, about 2-fold of that in the pristine Ag NCs). Subsequently, a higher concentration of ROS generated in Ag NCs@ELB leads to enhanced antibacterial activity, and enables to reduce the colony forming units (CFU) of both gram-positive and gram-negative bacteria with 3–4 orders of magnitude less than that treated with the pristine Ag NCs. In addition, the Ag NCs@ELB also shows good biocompatibility. This study suggests that surface engineering of active species (e.g., Ag NCs) with nutritionally-rich medium of the bacteria is an efficient way to improve their antibacterial activity.

    更新日期:2020-01-02
  • Interlayer-expanded MoS 2 assemblies for enhanced electrochemical storage of potassium ions
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Sijia Di, Pan Ding, Yeyun Wang, Yunling Wu, Jun Deng, Lin Jia, Yanguang Li

    Abstract Potassium-ion batteries are regarded as the low-cost alternative to lithium-ion batteries. However, their development is hampered by the lack of suitable electrode materials. In this work, we demonstrate that MoS2 with expanded interlayers represents a promising candidate for the electrochemical storage of potassium ions. Hierarchical interlayer-expanded MoS2 assemblies supported on carbon nanotubes are prepared via a straightforward solution method. The increased interlayer spacing not only enables the better accommodation of foreign ions, but also lowers the diffusion energy barrier and improves diffusion kinetics of ions. When investigated as the anode material of potassium ion batteries, our interlayer-expanded MoS2 assemblies exhibit an excellent electrochemical performance with large capacity (up to ∼ 520 mAhg−1), good rate capability (∼ 310 mAhg−1 at 1,000 mAg−1) and impressive cycling stability, superior to most competitors.

    更新日期:2020-01-02
  • GSH-triggered sequential catalysis for tumor imaging and eradication based on star-like Au/Pt enzyme carrier system
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Amin Zhang, Qian Zhang, Gabriel Alfranca, Shaojun Pan, Zhicheng Huang, Jin Cheng, Qiang Ma, Jie Song, Yunxiang Pan, Jian Ni, Lijun Ma, Daxiang Cui

    Abstract Distinctively different metabolism between tumor cells and normal cells endows tumor tissues unique microenvironment. In this regard, we have successfully prepared a sequential catalytic platform based on Au/Pt star for tumor theragnostic. The multifunctional probes consisted of a gold/platinum star-shaped core (Au/Pt star) conjugated with a GSH-sensitive disulfide bond (S–S), a targeting ligand (rHSA-FA), a near-infrared fluorophore (IR780) and glucose oxidase (GOx). When systemically administered in a xenografted murine model, the probes specifically targeted the tumor sites. As the disulfide linker was cleaved by intracellular GSH, the IR780 molecules could be released for photo-thermal therapy & photodynamic therapy (PTT&PDT) and imaging. Subsequently, the Pt nanolayer of the Au/Pt star and the GOx formed a sequential catalytic system: GOx effectively catalyzed intracellular glucose by consuming oxygen to generate H2O2 and enhance the local acidity, and the Pt layer exhibited peroxidase-like property to catalyze H2O2 producing toxic ·OH for tumor oxidative damage. Here we demonstrated that our probes simultaneously possessed a GSH-sensitive release, real-time imaging ability, and synergetic cancer starving-like therapy/enzyme oxidative therapy/PTT/PDT features, which provides a potential strategy for effective tumor theragnostic.

    更新日期:2020-01-02
  • Combining scanning tunneling microscope (STM) imaging and local manipulation to probe the high dose oxidation structure of the Si(111)-7×7 surface
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Dogan Kaya, Richard J. Cobley, Richard E. Palmer

    Understanding the atomistic formation of oxide layers on semiconductors is important for thin film fabrication, scaling down conventional devices and for the integration of emerging research materials. Here, the initial oxidation of Si(111) is studied using the scanning tunneling microscope. Prior to the complete saturation of the silicon surface with oxygen, we are able to probe the atomic nature of the oxide layer formation. We establish the threshold for local manipulation of inserted oxygen sites to be +3.8 V. Only by combining imaging with local atomic manipulation are we able to determine whether inserted oxygen exists beneath surface-bonded oxygen sites and differentiate between sites that have one and more than one oxygen atom inserted beneath the surface. Prior to the creation of the thin oxide film we observe a flip in the manipulation rates of inserted oxygen sites consistent with more oxygen inserting beneath the silicon surface.

    更新日期:2020-01-02
  • Photodeposition fabrication of hierarchical layered Co-doped Ni oxyhydroxide (Ni x Co 1−x OOH) catalysts with enhanced electrocatalytic performance for oxygen evolution reaction
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Liang-ai Huang, Zhishun He, Jianfeng Guo, Shi-en Pei, Haibo Shao, Jianming Wang

    Abstract Highly active, durable and inexpensive oxygen evolution reaction (OER) catalysts are crucial for achieving practical and high-efficiency water splitting. Herein, hierarchical interconnected NixCo1−xOOH nanosheet arrays supported on TiO2/Ti substrate have been fabricated through a facile photodeposition method. Compared with pristine NiOOH, the obtained NixCo1−xOOH nanosheet arrays possess larger exposed electrochemical active surface area, faster transfer and collection of electrons and stronger electronic interaction, showing a low overpotential of 350 mV at a current density of 10 mA·cm−2 and a small Tafel slope of 41 mV·dec−1 in basic solutions, with the OER performance superior to pristine NiOOH and most Ni-based catalysts. Furthermore, the NixCo1−xOOH electrode demonstrates excellent stability at the current density of 10 mA·cm−2 for 24 hours, which is attributed to the structural maintenance caused by the good adhesion of the catalyst and the substrate. Our study provides an alternative approach for the rational design of highly active and promising OER electrocatalysts.

    更新日期:2020-01-02
  • UV illumination enhanced desorption of oxygen molecules from monolayer MoS 2 surface
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Yuhang Wang, Zhiquan He, Jinbing Zhang, Hao Liu, Xubo Lai, Boyang Liu, Yibao Chen, Fengping Wang, Liuwan Zhang

    The oxygen adsorption can drastically alter the electronic properties of the 2D materials, which is usually difficult to be removed. In this work, we report the UV illumination induced desorption of the O2 molecules from the monolayer MoS2 surface by using the atmosphere dependent transport measurement, Kelvin probe microscopy, photoluminescence spectroscopy and X-ray photoelectron spectroscopy. Obvious increasing of the conductivity, rising of the Fermi level, and red shift of the photoluminescence peaks of the MoS2 were observed after the UV illumination in vacuum, indicating the elimination of the depletion effect from the oxygen adsorption. Such parameter changes can be reversibly recovered by the subsequent O2 exposure. Furthermore, obvious decreasing of the oxygen concentration after the UV illumination was also observed by X-ray photoelectron spectroscopy. Thus the UV induced O2 photodesorption effect is evidenced. The photo-excited charge transfer mechanism is proposed to account for the photodesorption effect. These results provide a nondestructive way to clean the MoS2 surface and manipulate the performance of the MoS2 based devices.

    更新日期:2020-01-02
  • Highly dispersed Co-Mo sulfide nanoparticles on reduced graphene oxide for lithium and sodium ion storage
    Nano Res. (IF 8.515) Pub Date : 2020-01-02
    Yuqing Liao, Chun Wu, Yaotang Zhong, Min Chen, Luyang Cai, Huirong Wang, Xiang Liu, Guozhong Cao, Weishan Li

    Abstract A novel hybrid, highly dispersed spinel Co-Mo sulfide nanoparticles on reduced graphene oxide (Co3S4/CoMo2S4@rGO), is reported as anode for lithium and sodium ion storage. The hybrid is synthesized by one-step hydrothermal method but exhibits excellent lithium and sodium storage performances. The as-synthesized Co3S4/CoMo2S4@rGO presents reversible capacity of 595.4 mA·h·g−1 and 408.8 mA·h·g−1 after 100 cycles at a current density of 0.2 A·g−1 for lithium and sodium ion storages, respectively. Such superior performances are attributed to the unique composition and structure of Co3S4/CoMo2S4@rGO. The rGO provides a good electronically conductive network and ensures the formation of spinel Co3S4/CoMo2S4 nanoparticles, the Co3S4/CoMo2S4 nanoparticles provide large reaction surface for lithium and sodium intercalation/deintercalation, and the spinel structure allows fast lithium and sodium ion diffusion in three dimensions.

    更新日期:2020-01-02
  • Self-assembled core-shell polydopamine@MXene with synergistic solar absorption capability for highly efficient solar-to-vapor generation
    Nano Res. (IF 8.515) Pub Date : 2019-12-27
    Xing Zhao, Xiang-Jun Zha, Li-Sheng Tang, Jun-Hong Pu, Kai Ke, Rui-Ying Bao, Zheng-ying Liu, Ming-Bo Yang, Wei Yang

    As a renewable and environment-friendly technology for seawater desalination and wastewater purification, solar energy triggered steam generation is attractive to address the long-standing global water scarcity issues. However, practical utilization of solar energy for steam generation is severely restricted by the complex synthesis, low energy conversion efficiency, insufficient solar spectrum absorption and water extraction capability of state-of-the-art technologies. Here, for the first time, we report a facile strategy to realize hydrogen bond induced self-assembly of a polydopamine (PDA)@MXene microsphere photothermal layer for synergistically achieving wide-spectrum and highly efficient solar absorption capability (≈ 96% in a wide solar spectrum range of 250–1,500 nm wavelength). Moreover, such a system renders fast water transport and vapor escaping due to the intrinsically hydrophilic nature of both MXene and PDA, as well as the interspacing between core-shell microspheres. The solar-to-vapor conversion efficiencies under the solar illumination of 1 sun and 4 sun are as high as 85.2% and 93.6%, respectively. Besides, the PDA@MXene photothermal layer renders the system durable mechanical properties, allowing producing clean water from seawater with the salt rejection rate beyond 99%. Furthermore, stable light absorption performance can be achieved and well maintained due to the formation of ternary TiO2/C/MXene complex caused by oxidative degradation of MXene. Therefore, this work proposes an attractive MXene-assisted strategy for fabricating high performance photothermal composites for advanced solar-driven seawater desalination applications.

    更新日期:2019-12-29
  • Room-temperature photodeposition of conformal transition metal based cocatalysts on BiVO 4 for enhanced photoelectrochemical water splitting
    Nano Res. (IF 8.515) Pub Date : 2019-12-27
    Lu Wang, Tao Zhang, Jinzhan Su, Liejin Guo

    Abstract Photoelectrochemical (PEC) water splitting using semiconductors offers a promising way to convert renewable solar energy to clean hydrogen fuels. However, due to the sluggish reaction kinetics of water oxidation, significant charge recombination occurred at the photoanode/electrolyte interface and cause decrease of its PEC performance. To reduce the surface recombination, we deposit different transition metal complexes on BiVO4 nanocone arrays by a versatile light driven in-situ two electrode photodeposition approach without applied bias. Conformal cobalt phosphate “Co-Pi”, nickel borate “Ni-Bi” and manganese phosphate “Mn-Pi” complexes were deposited on BiVO4 nanocone arrays to form core-shell structure photoanode, all of which lead to enhanced photoelectrochemical performance. The photocurrent of the Co-Pi/BiVO4 photoanode under front-side illumination for 5 min is increased by 4 folds comparing to that of bare BiVO4 photoanode at 0.6 V vs. RHE, reaching a hole transfer efficiency as high as 94.5% at 1.23 V vs. RHE. The proposed photodeposition strategy is simple and efficient, and can be extended to deposite cocatalyst on other semiconductors with a valence band edge located at a potential more positive than the oxidation potential of transition metal ion in the cocatalyst.

    更新日期:2019-12-27
  • Synthesis and transformation of zero-dimensional Cs 3 BiX 6 (X = Cl, Br) perovskite-analogue nanocrystals
    Nano Res. (IF 8.515) Pub Date : 2019-12-27
    Hanjun Yang, Tong Cai, Exian Liu, Katie Hills-Kimball, Jianbo Gao, Ou Chen

    Abstract The unique structure of zero-dimensional (0D) perovskite-analogues has attracted a great amount of research interest in recent years. To date, the current compositional library of 0D perovskites is largely limited to the lead-based Cs4PbX6 (X = Cl, Br, and I) systems. In this work, we report a new synthesis of lead-free 0D Cs3BiX6 (X = Cl, Br) perovskite-analogue nanocrystals (NCs) with a uniform cubic shape. We observe a broad photoluminescence peak centered at 390 nm for the 0D Cs3BiCl6 NCs at low temperatures. This feature originates from a self-trapped exciton mechanism. In situ thermal stability studies show that Cs3BiX6 NCs remain stable upon heating up to 200 °C without crystal structural degradation. Moreover, we demonstrate that the Cs3BiX6 NCs can transform into other bismuth-based perovskite-analogues via facile anion exchange or metal ion insertion reactions. Our study presented here offers the opportunity for further understanding of the structure-property relationship of 0D perovskite-analogue materials, leading toward their future optoelectronic applications.

    更新日期:2019-12-27
  • Nano-enabled cellular engineering for bioelectric studies
    Nano Res. (IF 8.515) Pub Date : 2019-12-21
    Jiuyun Shi, Clementene Clayton, Bozhi Tian

    Engineered cells have opened up a new avenue for scientists and engineers to achieve specialized biological functions. Nanomaterials, such as silicon nanowires and quantum dots, can establish tight interfaces with cells either extra- or intracellularly, and they have already been widely used to control cellular functions. The future exploration of nanomaterials in cellular engineering may reveal numerous opportunities in both fundamental bioelectric studies and clinic applications. In this review, we highlight several nanomaterials-enabled non-genetic approaches to fabricating engineered cells. First, we briefly review the latest progress in engineered or synthetic cells, such as protocells that create cell-like behaviors from nonliving building blocks, and cells made by genetic or chemical modifications. Next, we illustrate the need for non-genetic cellular engineering with semiconductors and present some examples where chemical synthesis yields complex morphology or functions needed for biointerfaces. We then provide discussions in detail about the semiconductor nanostructure-enabled neural, cardiac, and microbial modulations. We also suggest the need to integrate tissue engineering with semiconductor devices to carry out more complex functions. We end this review by providing our perspectives for future development in non-genetic cellular engineering.

    更新日期:2019-12-21
  • FeOOH quantum dots decorated graphene sheet: An efficient electrocatalyst for ambient N 2 reduction
    Nano Res. (IF 8.515) Pub Date : 2019-12-20
    Xiaojuan Zhu, Jinxiu Zhao, Lei Ji, Tongwei Wu, Ting Wang, Shuyan Gao, Abdulmohsen Ali Alshehri, Khalid Ahmed Alzahrani, Yonglan Luo, Yimo Xiang, Baozhan Zheng, Xuping Sun

    Electrochemical N2 reduction offers a promising alternative to the Haber-Bosch process for sustainable NH3 synthesis at ambient conditions, but it needs efficient catalysts for the N2 reduction reaction (NRR). Here, we report that FeOOH quantum dots decorated graphene sheet acts as a superior catalyst toward enhanced electrocatalytic N2 reduction to NH3 under ambient conditions. In 0.1 M LiClO4, this hybrid attains a large NH3 yield rate and a high Faradaic efficiency of 27.3 µg·h−1·mg−1cat. and 14.6% at −0.4 V vs. reversible hydrogen electrode, respectively, rivalling the current efficiency of all Fe-based NRR electrocatalysts in aqueous media. It also shows strong durability during the electrolytic process.

    更新日期:2019-12-20
  • Molecular imaging of advanced atherosclerotic plaques with folate receptor-targeted 2D nanoprobes
    Nano Res. (IF 8.515) Pub Date : 2019-12-19
    Zhide Guo, Liu Yang, Mei Chen, Xuejun Wen, Huanhuan Liu, Jingchao Li, Duo Xu, Yuanyuan An, Changrong Shi, Jindian Li, Xinhui Su, Zijing Li, Ting Liu, Rongqiang Zhuang, Nanfeng Zheng, Haibo Zhu, Xianzhong Zhang

    Vulnerable atherosclerotic plaques are responsible for most cardiovascular diseases (CVDs). Folate receptor (FR) positive activated macrophages were thought to be a prominent component in the development of vulnerable plaque. The objective of this study is to develop folate conjugated two-dimensional (2D) Pd@Au nanomaterials (Pd@Au-PEG-FA) for targeted multimodal imaging of the FRs in advanced atherosclerotic plaques. Pharmacokinetic and imaging studies (single photon emission computed tomography (SPECT), computed tomography (CT) and photoacoustic (PA) imaging) were performed to confirm the prolonged blood half-life and enrichment of radioactivity in atherosclerotic plaques. Strong signals were detected in vivo with SPECT, CT and PA imaging in heavy atherosclerotic plaques, which were significantly higher than those of the normal aortas after injection of Pd@Au-PEG-FA. Blocking studies with preinjection of excess FA could effectively reduce the targeting ability of Pd@Au-PEG-FA in atherosclerotic plaques, further demonstrating the specific binding of Pd@Au-PEG-FA for plaque lesions. Histopathological characterization revealed that the signal of probe was in accordance with the high-risk plaques. In summary, the Pd@Au-PEG-FA has favorable pharmacokinetic properties and provides a valuable approach for detecting high-risk plaques in the presence of FRs in atherosclerotic plaques.

    更新日期:2019-12-20
  • A prospective future towards bio/medical technology and bioelectronics based on 2D vdWs heterostructures
    Nano Res. (IF 8.515) Pub Date : 2019-12-19
    Guru Prakash Neupane, Linglong Zhang, Tanju Yildirim, Kai Zhou, Bowen Wang, Yilin Tang, Wendi Ma, Yunzhou Xue, Yuerui Lu

    Abstract Nano-biotechnology research has become extremely important due to the possibilities in manipulation and characterization of biological molecules through nanodevices. Nanomaterials exhibit exciting electrical, optoelectronic, magnetic, mechanical and chemical properties that can be exploited to develop efficient biosensors or bio-probes. Those unique properties in nanomaterials can also be used in bioimaging and cancer therapeutics, where biomolecules influence the inherent properties in nanomaterials. Effective manipulation of nanomaterial properties can lead to many breakthroughs in nanotechnology applications. Nowadays, 2D nanomaterials have emerged as viable materials for nanotechnology. Large cross-section area and functional availability of 2D or 1D quantum limit in these nanomaterials allow greater flexibility and better nanodevice performance. 2D nanomaterials enable advanced bioelectronics to be more easily integrated due to their atomic thickness, biocompatibility, mechanical flexibility and conformity. Furthermore, with the development of 2D material heterostructures, enhanced material properties can be obtained which can directly influence bio-nanotechnology applications. This article firstly reviews the development of various types of 2D heterostructures in a wide variety of nano-biotechnology applications. Furthermore, future 2D heterostructure scopes in bioimaging, nanomedicine, bio-markers/therapy and bioelectronics are discussed. This paper can be an avenue for providing a wide scope for 2D van der Waals (vdWs) heterostructures in bio- and medical fields.

    更新日期:2019-12-19
  • (Metal yolk)/(porous ceria shell) nanostructures for high-performance plasmonic photocatalysis under visible light
    Nano Res. (IF 8.515) Pub Date : 2019-12-19
    Nina Jiang, Danyang Li, Lili Liang, Qing Xu, Lei Shao, Shi-Bin Wang, Aizheng Chen, Jianfang Wang

    Abstract We describe a route to the preparation of (metal yolk)/(porous ceria shell) nanostructures through the heterogeneous growth of ceria on porous metal nanoparticles followed by the calcination-induced shrinkage of the nanoparticles. The approach allows for the control of the ceria shell thickness, the metal yolk composition and size, which is difficult to realize through common templating approaches. The yolk/shell nanostructures with monometallic Pt and bimetallic PtAg yolks featuring plasmon-induced broadband light absorption in the visible region are rationally designed and constructed. The superior photocatalytic activities of the obtained nanostructures are demonstrated by the selective oxidation of benzyl alcohol under visible light. The excellent activities are ascribed to the synergistic effects of the metal yolk and the ceria shell on the light absorption, electron-hole separation and efficient mass transfer. Our synthesis of the (metal yolk)/(porous ceria shell) nanostructures points out a way to the creation of sophisticated heteronanostructures for high-performance photocatalysis.

    更新日期:2019-12-19
  • Highly conductive dodecaborate/MXene composites for high performance supercapacitors
    Nano Res. (IF 8.515) Pub Date : 2019-12-18
    Zhenxing Li, Chang Ma, Yangyang Wen, Zhiting Wei, Xiaofei Xing, Junmei Chu, Chengcheng Yu, Kaili Wang, Zhao-Kui Wang

    With the increasingly prominent energy and environmental issues, the supercapacitors, as a highly efficient and clean energy conversion and storage devices, meet the requirements well. However, it is still a challenge to enhance the capacitance and energy density of supercapacitors. A novel and highly conductive dodecaborate/MXene composites have been designed for high performance supercapacitors. The surface charge property of MXene was modified by a simple ultrasonic treatment with ammonium ion, and the dodecaborate ion can be inserted into the inner surface of MXene by electrostatic adsorption. Due to the unique icosahedral cage conjugate structure formed by the B-B bond and the highly delocalized three-dimensional π bond structure of the electrons, the negative charge is delocalied on the whole dodecaborate ion, which reduces the ability to bind to cations. Therefore, the cations can move easily, and the dodecaborate can act as a “lubricant” for ion diffusion between the MXene layers, which significantly improves the ion transfer rate of supercapacitors. The dodecaborate/MXene composites can achieve an extremely high specific capacitance of 366 F.g-1 at a scan rate of 2 mV.s-1, which is more than eight times higher than that of MXene (43 F1-) at the same scan rate. Our finding provides a novel route on the fabrication of the high performance supercapacitors.

    更新日期:2019-12-19
  • Highly graphitized carbon nanosheets with embedded Ni nanocrystals as anode for Li-ion batteries
    Nano Res. (IF 8.515) Pub Date : 2019-12-18
    Francisco Javier Soler-Piña, Celia Hernández-Rentero, Alvaro Caballero, Julián Morales, Enrique Rodríguez-Castellón, Jesús Canales-Vázquez

    A C/Ni composite was prepared via thermal decomposition of a nickel oleate complex at 700 °C, yielding disperse Ni nanocrystals with an average size of 20 nm, encapsulated by carbon nanosheets as deduced from transmission electron microscopy (TEM) images and confirmed from X-ray photoelectron spectroscopy (XPS). Furthermore, the X-ray diffraction pattern revealed a good ordering of the carbon layers, forced by the Ni encapsulation to adopt a bending structure. Considering the close interaction between the graphitized framework and the metallic nanoparticles we have studied the properties of the composite as an anode for Li-ion batteries. Compared with other nanostructured synthetic carbons, this carbon composite has a low voltage hysteresis and a modest irreversible capacity value, properties that play a significant role in its behaviour as electrodes in full cell configuration. At moderate rate values, 0.25 C, the electrode delivers an average capacity value around 723 mAh·g−1 on cycling, among the highest values so far reported for this carbon type. At higher rate values, 1 C, the average capacity values delivered by the cell on cycling decrease, around 205 mAh·g−1, but it maintains good capacity retention, a coulombic efficiency close to 100% after the first cycles and recovery of the capacity values when the rate is restored from 3 to 0.1 C.

    更新日期:2019-12-19
  • Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites
    Nano Res. (IF 8.515) Pub Date : 2019-12-18
    Enzheng Shi, Shuang Cui, Nicholas Kempf, Qingfeng Xing, Thomas Chasapis, Huazhang Zhu, Zhe Li, Je-Hyeong Bahk, G. Jeffrey Snyder, Yanliang Zhang, Renkun Chen, Yue Wu

    Anisotropy and inhomogeneity are ubiquitous in spark plasma sintered thermoelectric devices. However, the origin of inhomogeneity in thermoelectric nanocomposites has rarely been investigated so far. Herein, we systematically study the impact of inhomogeneity in spark plasma sintered bismuth antimony telluride (BiSbTe) thermoelectric nanocomposites fabricated from solution-synthesized nanoplates. The figure of merit can reach 1.18, which, however, can be overestimated to 1.88 without considering the inhomogeneity. Our study reveals that the inhomogeneity in thermoelectric properties is attributed to the non-uniformity of porosity, textures and elemental distribution from electron backscatter diffraction and energy-dispersive spectroscopy characterizations. This finding suggests that the optimization of bulk material homogeneity should also be actively pursued in any future thermoelectric material research.

    更新日期:2019-12-19
  • Spatial Raman mapping investigation of SERS performance related to localized surface plasmons
    Nano Res. (IF 8.515) Pub Date : 2019-12-18
    Yansheng Liu, Feng Luo

    In this research, it reported a novel three-dimensional (3D) metallic hybrid system by introducing single-layer graphene (SLG) between silver nanoparticles (NPs) and silver nano-discs (NDs) arrays (Ag NPs/SLG/Ag NDs). By combining the plasmonic metallic nanostructures and the unique physical/chemical properties of graphene, Ag NPs/SLG/Ag NDs hybrid substrate was fabricated, and it exhibited extremely high surface-enhanced Raman scattering (SERS) performance. By tuning the diameter of Ag NDs, the SERS performance of Ag NPs/SLG/Ag NDs hybrid substrate has been systematically studied. The detection limit for rhodamine 6g (R6G) could reach the concentrations as low as 1 × 10−12 mol/L, and the average enhancement factor (EF) of the Ag NPs/SLG/Ag NDs substrate could reach 5.65 × 108. These advantages indicated that the Ag NPs/SLG/Ag NDs hybrid substrate could be regarded as a candidate for organic molecules detection under extremely low concentration. Besides, spatial Raman mapping of Ag NPs/SLG/Ag NDs with 2.5 μm diameter NDs showed the larger SERE signal existed around the rim of Ag NDs which was related to the localized surface plasmons. This phenomenon was contributed by a larger electromagnetic field which was tuned by Ag NPs and the edge of Ag NDs. This mechanism also has been confirmed by the electromagnetic simulation result.

    更新日期:2019-12-19
  • In situ observation of temperature-dependent atomistic and mesoscale oxidation mechanisms of aluminum nanoparticles
    Nano Res. (IF 8.515) Pub Date : 2019-12-18
    Jing Gao, Jingyuan Yan, Beikai Zhao, Ze Zhang, Qian Yu

    Oxidation is a universal process causing metals’ corrosion and degradation. While intensive researches have been conducted for decades, the detailed atomistic and mesoscale mechanisms of metal oxidation are still not well understood. Here using in situ environmental transmission electron microscopy (E-TEM) with atomic resolution, we revealed systematically the oxidation mechanisms of aluminum from ambient temperature to ~ 600 °C. It was found that an amorphous oxide layer formed readily once Al was exposed to air at room temperature. At ~ 150 °C, triangle-shaped Al2O3 lamellas grew selectively on gas/solid (oxygen/amorphous oxide layer) interface, however, the thickness of the oxide layer slowly increased mainly due to the inward diffusion of oxygen. As the temperature further increased, partial amorphous-to-crystallization transition was observed on the amorphous oxide film, resulting in the formation of highly dense nano-cracks in the oxide layer. At ~ 600 °C, fast oxidation process was observed. Lamellas grew into terraces on the oxide/gas interface, indicating that the high temperature oxidation is controlled by the outward diffusion of Al. Single or double/multi-layers of oxide nucleated at the corners of the terraces, forming dense γ’-Al2O3, which is a metastable oxide structure but may be stabilized at nanoscale.

    更新日期:2019-12-19
  • Graphitic carbon nitride with different dimensionalities for energy and environmental applications
    Nano Res. (IF 8.515) Pub Date : 2019-12-18
    Qiang Hao, Guohua Jia, Wei Wei, Ajayan Vinu, Yuan Wang, Hamidreza Arandiyan, Bing-Jie Ni

    As a metal-free semiconductor, graphitic carbon nitride (g-C3N4) has received extensive attention due to its high stability, nontoxicity, facile and low-cost synthesis, appropriate band gap in the visible spectral range and wide availability of resources. The dimensions of g-C3N4 can influence the regime of the confinement of electrons, and consequently, g-C3N4 with various dimensionalities shows different properties, making them available for many stimulating applications. Although there are some reviews focusing on the synthesis strategy and applications of g-C3N4, there is still a lack of comprehensive review that systemically summarises the synthesis and application of different dimensions of g-C3N4, which can provide an important theoretical and practical basis for the development of g-C3N4 with different dimensionalities and maximises their potential in diverse applications. By reviewing the latest progress of g-C3N4 studies, we aim to summarise the preparation of g-C3N4 with different dimensionalities using various structural engineering strategies, discuss the fundamental bottlenecks of currently existing methods and their solution strategies, and explore their applications in energy and environmental applications. Furthermore, it also puts forward the views on the future research direction of these unique materials.

    更新日期:2019-12-19
  • Wireless phototherapeutic contact lenses and glasses with red light-emitting diodes
    Nano Res. (IF 8.515) Pub Date : 2019-12-17
    Young-Geun Park, Eunkyung Cha, Hyeon Seok An, Kyoung-Pil Lee, Myoung Hoon Song, Hong Kyun Kim, Jang-Ung Park

    Light-mediated therapeutics have attracted considerable attention as a method for the treatment of ophthalmologic diseases, such as age-related macular degeneration, because of their non-invasiveness and the effectiveness to ameliorate the oxidative stress of retinal cells. However, the current phototherapeutic devices are opaque, bulky, and tethered forms, so they are not feasible for use in continuous treatment during the patient’s daily life. Herein, we report wireless, wearable phototherapeutic devices with red light-emitting diodes for continuous treatments. Red light-emitting diodes were formed to be conformal to three-dimensional surfaces of glasses and contact lenses. Furthermore, fabricated light-emitting diodes had either transparency or a miniaturized size so that the user’s view is not obstructed. Also, these devices were operated wirelessly with control of the light intensity. In addition, in-vitro and in-vivo tests using human retinal epithelial cells and a live rabbit demonstrated the effectiveness and reliable operation as phototherapeutic devices.

    更新日期:2019-12-18
  • Cell vibron polariton resonantly self-confined in the myelin sheath of nerve
    Nano Res. (IF 8.515) Pub Date : 2019-12-16
    Bo Song, Yousheng Shu

    Polaritons are arousing tremendous interests in physics and material sciences for their unique and amazing properties, especially including the condensation, lasing without inversion and even room-temperature superfluidity. Herein, we propose a cell vibron polariton (cell-VP): a collectively coherent mode of a photon and all phospholipid molecules in a myelin sheath formed by glial cells. Cell-VP can be resonantly self-confined in the myelin sheath under physiological conditions. The observations benefit from the specifically compact, ordered and polar thin-film structure of the sheath, and the relatively strong coupling of the mid-infrared photon with the vibrons of phospholipid tails in the myelin. The underlying physics is revealed to be the collectively coherent superposition of the photon and vibrons, the polariton induced significant enhancement of myelin permittivity, and the resonance of the polariton with the sheath. The captured cell-VPs in myelin sheaths may provide a promising way for super-efficient consumption of extra-weak bioenergy and even directly serve for quantum information. These findings further the understanding of nervous system operations at cellular level from the view of quantum mechanics.

    更新日期:2019-12-17
  • Mitigation of voltage decay in Li-rich layered oxides as cathode materials for lithium-ion batteries
    Nano Res. (IF 8.515) Pub Date : 2019-12-14
    Wenhui Hu, Youxiang Zhang, Ling Zan, Hengjiang Cong

    Lithium-rich layered oxides (LLOs) have been extensively studied as cathode materials for lithium-ion batteries (LIBs) by researchers all over the world in the past decades due to their high specific capacities and high charge-discharge voltages. However, as cathode materials LLOs have disadvantages of significant voltage and capacity decays during the charge-discharge cycling. It was shown in the past that fine-tuning of structures and compositions was critical to the performances of this kind of materials. In this report, LLOs with target composition of Li1.17Mn0.50Ni0.24Co0.09O2 were prepared by carbonate co-precipitation method with different pH values. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and electrochemical impedance spectroscopies (EIS) were used to investigate the structures and morphologies of the materials and to understand the improvements of their electrochemical performances. With the pH values increased from 7.5 to 8.5, the Li/Ni ratios in the compositions decreased from 5.17 to 4.64, and the initial Coulombic efficiency, cycling stability and average discharge voltages were gained impressively. Especially, the material synthesized at pH = 8.5 delivered a reversible discharge capacity of 263 mAhg−1 during the first cycle, with 79.0% initial Coulombic efficiency, at the rate of 0.1 C and a superior capacity retention of 94% after 100 cycles at the rate of 1 C. Furthermore, this material exhibited an initial average discharge voltage of 3.65 V, with a voltage decay of only 0.09 V after 50 charge-discharge cycles. The improved electrochemical performances by varying the pH values in the synthesis process can be explained by the mitigation of layered-to-spinel phase transformation and the reduction of solid-electrolyte interface (SEI) resistance. We hope this work can shed some light on the alleviation of voltage and capacity decay issues of the LLOs cathode materials.

    更新日期:2019-12-17
  • Transformation between nanosheets and nanowires structure in MnO 2 upon providing Co 2+ ions and applications for microwave absorption
    Nano Res. (IF 8.515) Pub Date : 2019-12-12
    Lulu Song, Yuping Duan, Jia Liu, Huifang Pang

    The phase transition process of the MnO2 phase with increases in Co2+ doping can be described by the Ouroboros symbol. The undoped sample is pure δ-MnO2 with nanosheets structures. Then a small amount of Co2+ ions changes the final products and generates α-MnO2 nanofibres in the δ-MnO2 matrix. The products become pure α-MnO2 with an appropriate amount of Co added. However, when the Co amount continues to increase, the amount of α-MnO2 decreases in the products and turns back to form pure δ-MnO2 in the end. Analysing the electromagnetic absorption performance, the relationship between the properties and the proportion of δ-MnO2/α-MnO2 in the powders adjusted by Co2+ doping has been explored, and the composites of δ-/α-MnO2 show better absorption ability than the single-phase samples. As a result, the optimal reflection loss (RL) is −54.8 dB, and the effective absorption bandwidth can cover the Ku band at a thickness of 2.2 mm and the X band at a thickness of 3.1 mm with 50 wt.% filler loading ratios. This research might shed new light on the improvement of novel microwave absorption materials.

    更新日期:2019-12-13
  • High-performance transparent conducting films of long single-walled carbon nanotubes synthesized from toluene alone
    Nano Res. (IF 8.515) Pub Date : 2019-12-10
    Er-Xiong Ding, Aqeel Hussain, Saeed Ahmad, Qiang Zhang, Yongping Liao, Hua Jiang, Esko I. Kauppinen

    Single-walled carbon nanotube (SWCNT) transparent conducting films (TCFs) are attracting increasing attention due to their exceptional optoelectronic properties. Toluene is a proposed carbon source for SWCNT synthesis, but the growth parameters of SWCNTs and their TCF optoelectronic performance (i.e., sheet resistance versus transmittance) have been insufficiently evaluated. Here, we have for the first time reported a systematic study of the fabrication of high-performance SWCNT TCFs using toluene alone as the carbon source. The mechanisms behind each observed phenomenon were elucidated using optical and microscopy techniques. By optimizing the growth parameters, high yields of SWCNT TCFs exhibiting a considerably low sheet resistance of 57 Ω/sq at 90% transmittance were obtained. This competitive optoelectronic performance is mainly attributable to long SWCNT bundles (mean length is 41.4 μm) in the film. Additionally, a chirality map determined by electron diffraction displays a bimodal distribution of chiral angles divided at 15°, which is close to both armchair and zigzag edges. Our study paved the way towards scaled-up production of SWCNTs for the fabrication of high-performance TCFs for industrial applications.

    更新日期:2019-12-11
  • Erratum to: Effects of redox-active interlayer anions on the oxygen evolution reactivity of NiFe-layered double hydroxide nanosheets
    Nano Res. (IF 8.515) Pub Date : 2019-12-06
    Daojin Zhou, Zhao Cai, Yongmin Bi, Weiliang Tian, Ma Luo, Qian Zhang, Qian Zhang, Qixian Xie, Jindi Wang, Yaping Li, Yun Kuang, Xue Duan, Michal Bajdich, Samira Siahrostami, Xiaoming Sun

    The labels in Fig. 8 in the original version of this article were unfortunately misplaced. The corrected figure is as follow.

    更新日期:2019-12-11
  • Ultrahigh sensitive near-infrared photodetectors based on MoTe 2 /germanium heterostructure
    Nano Res. (IF 8.515) Pub Date : 2019-12-09
    Wenjie Chen, Renrong Liang, Shuqin Zhang, Yu Liu, Weijun Cheng, Chuanchuan Sun, Jun Xu

    The efficient near-infrared light detection of the MoTe2/germanium (Ge) heterojunction has been demonstrated. The fabricated MoTe2/Ge van der Waals heterojunction shows excellent photoresponse performances under the illumination of a 915 nm laser. The photoresponsivity and specific detectivity can reach to 12,460 A/W and 3.3 × 1012 Jones, respectively. And the photoresponse time is 5 ms. However, the MoTe2/Ge heterojunction suffers from a large reverse current at dark due to the low barrier between MoTe2 and Ge. Therefore, to reduce the reverse current, an ultrathin GeO2 layer deposited by ozone oxidation has been introduced to the MoTe2/Ge heterojunction. The reverse current of the MoTe2/GeO2/Ge heterojunction at dark was suppressed from 0.44 µA/µm2 to 0.03 nA/µm2, being reduced by more than four orders of magnitude. The MoTe2/Ge heterojunction with the GeO2 layer also exhibits good photoresponse performances, with a high responsivity of 15.6 A/W, short response time of 5 ms, and good specific detectivity of 4.86 × 1011 Jones. These properties suggest that MoTe2/Ge heterostructure is one of the promising structures for the development of high performance near-infrared photodetectors.

    更新日期:2019-12-09
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