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  • Intrinsic excitonic emission and valley Zeeman splitting in epitaxial MS 2 (M = Mo and W) monolayers on hexagonal boron nitride
    Nano Res. (IF 7.994) Pub Date : 2018-07-21
    Chunxiao Cong, Chenji Zou, Bingchen Cao, Lishu Wu, Jingzhi Shang, Haomin Wang, Zhijun Qiu, Laigui Hu, Pengfei Tian, Ran Liu, Ting Yu

    None

    更新日期:2018-07-21
  • A novel PMA/PEG-based composite polymer electrolyte for all-solid-state sodium ion batteries
    Nano Res. (IF 7.994) Pub Date : 2018-07-19
    Xuejing Zhang, Xingchao Wang, Shuang Liu, Zhanliang Tao, Jun Chen

    In recent years, development of all-solid-state batteries has become a promising approach to improve the safety of batteries. Herein, we report the preparation of a new composite polymer electrolyte (CPE) for use in all-solid-state sodium ion batteries. The CPE comprising of poly(methacrylate) (PMA), poly(ethylene glycol) (PEG), α-Al2O3 with acidic surface sites, and NaClO4 exhibited high ionic conductivity (1.46 × 10-4 S·cm-1 at 70 °C), wide electrochemical stability window (4.5 V vs. Na+/Na), and good mechanical strength. With the introduction of the prepared CPE and Na3V2(PO4)3, the final all-solid-state sodium ion batteries showed good rate and cycle performance, with a high reversible capacity of 85 mAh·g-1 when operated at 0.5 C (1 C = 118 mA·g–1) and 94.1% capacity retention rate after 350 cycles at 70 °C. Our work provides a novel solid electrolyte for the development of all-solid-state sodium ion batteries.

    更新日期:2018-07-20
  • Amine-assisted synthesis of FeS@N-C porous nanowires for highly reversible lithium storage
    Nano Res. (IF 7.994) Pub Date : 2018-07-19
    Xiujuan Wei, Xin Tan, Jiasheng Meng, Xuanpeng Wang, Ping Hu, Wei Yang, Shuangshuang Tan, Qinyou An, Liqiang Mai

    None

    更新日期:2018-07-20
  • Tuning the morphology of chevron-type graphene nanoribbons by choice of annealing temperature
    Nano Res. (IF 7.994) Pub Date : 2018-07-19
    Yun Cao, Jing Qi, Yan-Fang Zhang, Li Huang, Qi Zheng, Xiao Lin, Zhihai Cheng, Yu-Yang Zhang, Xinliang Feng, Shixuan Du, Sokrates T. Pantelides, Hong-Jun Gao

    Bottom-up synthesis of graphene nanoribbons (GNRs) by surface-assisted polymerization and cyclodehydrogenation of specifically designed precursor monomers has been shown to yield precise edges and doping. Here we use a precursor monomer containing sulfur atoms to fabricate nanostructures on a Au(111) surface at different annealing temperatures. The nanostructures have distinct configurations, varying from sulfur-doped polymers to sulfur-doped chevron-type GNRs (CGNRs) and, finally, pristine graphene nanoribbons with specific edges of periodic five-member carbon rings. Non-contact atomic force microscopy provides clear evidence for the cleavage of C–S bonds and formation of pristine CGNRs at elevated annealing temperatures. First-principles calculations show that the CGNRs exhibit negative differential resistance.

    更新日期:2018-07-20
  • 更新日期:2018-07-20
  • Nanoformulation of metal complexes: Intelligent stimuli-responsive platforms for precision therapeutics
    Nano Res. (IF 7.994) Pub Date : 2018-07-16
    Ming Hu, Xiangzhao Ai, Zhimin Wang, Zhijun Zhang, Haolun Cheong, Wenmin Zhang, Jun Lin, Juan Li, Huanghao Yang, Bengang Xing

    None

    更新日期:2018-07-19
  • E-beam manipulation of Si atoms on graphene edges with an aberration-corrected scanning transmission electron microscope
    Nano Res. (IF 7.994) Pub Date : 2018-07-14
    Ondrej Dyck, Songkil Kim, Sergei V. Kalinin, Stephen Jesse

    The burgeoning field of atomic-level material control holds great promise for future breakthroughs in quantum and memristive device manufacture and fundamental studies of atomic-scale chemistry. Realization of atom-by-atom control of matter represents a complex and ongoing challenge. Here, we explore the feasibility of controllable motion of dopant Si atoms at the edges of graphene via the sub-atomically focused electron beam in a scanning transmission electron microscope. We demonstrate that the graphene edges can be cleaned of Si atoms and then subsequently replenished from nearby source material. It is also shown how Si edge atoms may be “pushed” from the edge of a small hole into the bulk of the graphene lattice and from the bulk of the lattice back to the edge. This is accomplished through sputtering of the edge of the graphene lattice to bury or uncover Si dopant atoms. Finally, we demonstrate e-beam mediated hole healing and incorporation of dopant atoms. These experiments form an initial step toward general atomic-scale material control.

    更新日期:2018-07-15
  • Inorganic nanoparticles and the microbiome
    Nano Res. (IF 7.994) Pub Date : 2018-07-13
    Kunyu Qiu, Phillip G. Durham, Aaron C. Anselmo

    None

    更新日期:2018-07-14
  • Simultaneous growth of carbon nanotubes on inner/outer surfaces of porous polyhedra: Advanced sulfur hosts for lithium-sulfur batteries
    Nano Res. (IF 7.994) Pub Date : 2018-07-13
    Hengyi Lu, Chao Zhang, Youfang Zhang, Yunpeng Huang, Mingkai Liu, Tianxi Liu

    None

    更新日期:2018-07-14
  • Phototriggered targeting of nanocarriers for drug delivery
    Nano Res. (IF 7.994) Pub Date : 2018-07-12
    Yafei Li, Yaming Zhang, Weiping Wang

    None

    更新日期:2018-07-12
  • A new sodium iron phosphate as a stable high-rate cathode material for sodium ion batteries
    Nano Res. (IF 7.994) Pub Date : 2018-07-12
    Xiaobo Zhu, Takashi Mochiku, Hiroki Fujii, Kaibin Tang, Yuxiang Hu, Zhenguo Huang, Bin Luo, Kiyoshi Ozawa, Lianzhou Wang

    None

    更新日期:2018-07-12
  • Self-immolative micellar drug delivery: The linker matters
    Nano Res. (IF 7.994) Pub Date : 2018-07-11
    Xuan Meng, Min Gao, Jian Deng, Di Lu, Aiping Fan, Dan Ding, Deling Kong, Zheng Wang, Yanjun Zhao

    None

    更新日期:2018-07-12
  • Nano functional neural interfaces
    Nano Res. (IF 7.994) Pub Date : 2018-07-10
    Yongchen Wang, Hanlin Zhu, Huiran Yang, Aaron D. Argall, Lan Luan, Chong Xie, Liang Guo

    Engineered functional neural interfaces (fNIs) serve as essential abiotic–biotic transducers between an engineered system and the nervous system. They convert external physical stimuli to cellular signals in stimulation mode or read out biological processes in recording mode. Information can be exchanged using electricity, light, magnetic fields, mechanical forces, heat, or chemical signals. fNIs have found applications for studying processes in neural circuits from cell cultures to organs to whole organisms. fNI-facilitated signal transduction schemes, coupled with easily manipulable and observable external physical signals, have attracted considerable attention in recent years. This enticing field is rapidly evolving toward miniaturization and biomimicry to achieve long-term interface stability with great signal transduction efficiency. Not only has a new generation of neuroelectrodes been invented, but the use of advanced fNIs that explore other physical modalities of neuromodulation and recording has begun to increase. This review covers these exciting developments and applications of fNIs that rely on nanoelectrodes, nanotransducers, or bionanotransducers to establish an interface with the nervous system. These nano fNIs are promising in offering a high spatial resolution, high target specificity, and high communication bandwidth by allowing for a high density and count of signal channels with minimum material volume and area to dramatically improve the chronic integration of the fNI to the target neural tissue. Such demanding advances in nano fNIs will greatly facilitate new opportunities not only for studying basic neuroscience but also for diagnosing and treating various neurological diseases.

    更新日期:2018-07-12
  • Bandgap broadening at grain boundaries in single-layer MoS 2
    Nano Res. (IF 7.994) Pub Date : 2018-07-07
    Dongfei Wang, Hua Yu, Lei Tao, Wende Xiao, Peng Fan, Tingting Zhang, Mengzhou Liao, Wei Guo, Dongxia Shi, Shixuan Du, Guangyu Zhang, Hongjun Gao

    None

    更新日期:2018-07-08
  • 更新日期:2018-07-08
  • Background-free latent fingerprint imaging based on nanocrystals with long-lived luminescence and pH-guided recognition
    Nano Res. (IF 7.994) Pub Date : 2018-07-06
    Zhiheng Li, Qian Wang, Yingqian Wang, Qinqin Ma, Jie Wang, Zhihao Li, Yingxue Li, Xiaobo Lv, Wei Wei, Lang Chen, Quan Yuan

    None

    更新日期:2018-07-08
  • Effect of matrix-nanoparticle interactions on recognition of aryldiazonium nanoparticle-imprinted matrices
    Nano Res. (IF 7.994) Pub Date : 2018-07-06
    Netta Bruchiel-Spanier, Linoy Dery, Noam Tal, Shahar Dery, Elad Gross, Daniel Mandler

    None

    更新日期:2018-07-08
  • Polymer nanoparticles as adjuvants in cancer immunotherapy
    Nano Res. (IF 7.994) Pub Date : 2018-07-06
    Shengxian Li, Xiangru Feng, Jixue Wang, Liang He, Chunxi Wang, Jianxun Ding, Xuesi Chen

    Immunotherapy is a promising strategy to inhibit cancer progression via activation of the immune system. In immunotherapy, adjuvants as immunologic stimulants or delivery systems play a critical role in inducing the antitumor immune response and decreasing the side effects of immune stimulants. Polymer nanoparticles have attracted increasing attention as an indispensable component of immunotherapy, owing to their favorable properties, such as excellent biocompatibility and biodegradability, flexible size, high activity as immune stimulants, large surface area for binding multivalent immune ligands, and high loading capacity for immune-related components. In cancer immunotherapy, polymer nanoparticles can protect cargo from the surrounding milieu, deliver the antigens and immunostimulatory molecules to antigen-presenting cells, or stimulate robust T cell response. This review summarizes the current advancements in polymer nanoparticle adjuvants for cancer immunotherapy and predicts their prospects in fundamental and clinical studies.

    更新日期:2018-07-08
  • 更新日期:2018-07-08
  • Drug targeting through platelet membrane-coated nanoparticles for the treatment of rheumatoid arthritis
    Nano Res. (IF 7.994) Pub Date : 2018-06-30
    Yuwei He, Ruixiang Li, Jianming Liang, Ying Zhu, Shuya Zhang, Zicong Zheng, Jing Qin, Zhiqing Pang, Jianxin Wang

    None

    更新日期:2018-07-01
  • Functionalization of silica nanoparticles for nucleic acid delivery
    Nano Res. (IF 7.994) Pub Date : 2018-06-27
    Rimpei Kamegawa, Mitsuru Naito, Kanjiro Miyata

    Silica nanoparticles (SiNPs) have been widely engineered for biomedical applications, such as bioimaging and drug delivery, because of their high tunability, which allows them to perform specific functions. In this review, we discuss the functionalization and performance of SiNPs for nucleic acid delivery. Nucleic acids, including plasmid DNA (pDNA) and small interfering RNA (siRNA), constitute the next generation molecular drugs for the treatment of intractable diseases. However, their low bioavailability requires delivery systems that can circumvent nuclease attack and kidney filtration to ensure efficient access to the target cell cytoplasm or nucleus. First, we discussed the biological significance of nucleic acids and the parameters required for their successful delivery. Next, we reviewed SiNP designing for nucleic acid delivery with respect to nucleic acid loading and release, cellular uptake, endosomal escape, and biocompatibility. In addition, we discussed the co-delivery potential of SiNPs. Finally, we analyzed the current challenges and future directions of SiNPs for advanced nucleic acid delivery.

    更新日期:2018-06-28
  • Aggregation-induced emission luminogen-assisted stimulated emission depletion nanoscopy for super-resolution mitochondrial visualization in live cells
    Nano Res. (IF 7.994) Pub Date : 2018-06-25
    Dongyu Li, Xiang Ni, Xiaoyan Zhang, Liwei Liu, Junle Qu, Dan Ding, Jun Qian

    None

    更新日期:2018-06-27
  • Nano-fried-eggs: Structural, optical, and magnetic characterization of physically prepared iron-silver nanoparticles
    Nano Res. (IF 7.994) Pub Date : 2018-06-25
    Julien Ramade, Nicolas Troc, Olivier Boisron, Michel Pellarin, Marie-Ange Lebault, Emmanuel Cottancin, Vitor T. A. Oiko, Rafael Cabreira Gomes, Varlei Rodrigues, Matthias Hillenkamp

    None

    更新日期:2018-06-27
  • Experimental evidence of the thickness- and electric-field-dependent topological phase transitions in topological crystalline insulator SnTe(111) thin films
    Nano Res. (IF 7.994) Pub Date : 2018-06-23
    Yan Gong, Kejing Zhu, Zhe Li, Yunyi Zang, Xiao Feng, Ding Zhang, Canli Song, Lili Wang, Wei Li, Xi Chen, Xu-Cun Ma, Qi-Kun Xue, Yong Xu, Ke He

    None

    更新日期:2018-06-27
  • Remote induction of in situ hydrogelation in a deep tissue, using an alternating magnetic field and superparamagnetic nanoparticles
    Nano Res. (IF 7.994) Pub Date : 2018-06-23
    Hwangjae Lee, Guru Karthikeyan Thirunavukkarasu, Semin Kim, Jae Young Lee

    None

    更新日期:2018-06-25
  • Transition-metal-doped NiSe 2 nanosheets towards efficient hydrogen evolution reactions
    Nano Res. (IF 7.994) Pub Date : 2018-06-23
    Tongtong Wang, Daqiang Gao, Wen Xiao, Pinxian Xi, Desheng Xue, John Wang

    None

    更新日期:2018-06-25
  • Large-size niobium disulfide nanoflakes down to bilayers grown by sulfurization
    Nano Res. (IF 7.994) Pub Date : 2018-06-20
    Zhen Li, Wencao Yang, Yaroslav Losovyj, Jun Chen, Enzhi Xu, Haoming Liu, Madilynn Werbianskyj, Herbert A. Fertig, Xingchen Ye, Shixiong Zhang

    None

    更新日期:2018-06-22
  • Entrapping multifunctional dendritic nanoparticles into a hydrogel for local therapeutic delivery and synergetic immunochemotherapy
    Nano Res. (IF 7.994) Pub Date : 2018-06-22
    Lei Jiang, Yang Ding, Xialin Xue, Sensen Zhou, Cheng Li, Xiaoke Zhang, Xiqun Jiang

    None

    更新日期:2018-06-22
  • High resolution, binder-free investigation of the intrinsic activity of immobilized NiFe LDH nanoparticles on etched carbon nanoelectrodes
    Nano Res. (IF 7.994) Pub Date : 2018-06-22
    Patrick Wilde, Stefan Barwe, Corina Andronescu, Wolfgang Schuhmann, Edgar Ventosa

    None

    更新日期:2018-06-22
  • Engineering subcellular-patterned biointerfaces to regulate the surface wetting of multicellular spheroids
    Nano Res. (IF 7.994) Pub Date : 2018-06-22
    Luying Wang, Pingqiang Cai, Jing Luo, Feilong Zhang, Jian Liu, Yupeng Chen, Zhongpeng Zhu, Yongyang Song, Bingquan Yang, Xi Liu, Xiaodong Chen, Shutao Wang

    None

    更新日期:2018-06-22
  • Temperature-responsive polymers: Synthesis, properties, and biomedical applications
    Nano Res. (IF 7.994) Pub Date : 2018-06-21
    Shenglin Qiao, Hao Wang

    None

    更新日期:2018-06-22
  • Tuning the structures of two-dimensional cuprous oxide confined on Au(111)
    Nano Res. (IF 7.994) Pub Date : 2018-06-20
    Qingfei Liu, Nannan Han, Shengbai Zhang, Jijun Zhao, Fan Yang, Xinhe Bao

    None

    更新日期:2018-06-22
  • Sub-micrometer-scale chemical analysis by nanosecond-laser-induced tip-enhanced ablation and ionization time-of-flight mass spectrometry
    Nano Res. (IF 7.994) Pub Date : 2018-06-20
    Xiaoping Li, Zhisen Liang, Shudi Zhang, Tongtong Wang, Wei Hang

    None

    更新日期:2018-06-20
  • Superlubricity of epitaxial monolayer WS 2 on graphene
    Nano Res. (IF 7.994) Pub Date : 2018-06-18
    Holger Büch, Antonio Rossi, Stiven Forti, Domenica Convertino, Valentina Tozzini, Camilla Coletti

    We report the superlubric sliding of monolayer tungsten disulfide (WS2) on epitaxial graphene (EG) grown on silicon carbide (SiC). Single-crystalline WS2 flakes with lateral size of hundreds of nanometers are obtained via chemical vapor deposition (CVD) on EG. Microscopic and diffraction analyses indicate that the WS2/EG stack is predominantly aligned with zero azimuthal rotation. The present experiments show that, when perturbed by a scanning probe microscopy (SPM) tip, the WS2 flakes are prone to slide over the graphene surfaces at room temperature. Atomistic force field-based molecular dynamics simulations indicate that, through local physical deformation of the WS2 flake, the scanning tip releases enough energy to the flake to overcome the motion activation barrier and trigger an ultralow-friction rototranslational displacement, that is superlubric. Experimental observations show that, after sliding, the WS2 flakes come to rest with a rotation of nπ/3 with respect to graphene. Moreover, atomically resolved measurements show that the interface is atomically sharp and the WS2 lattice is strain-free. These results help to shed light on nanotribological phenomena in van der Waals (vdW) heterostacks, and suggest that the applicative potential of the WS2/graphene heterostructure can be extended by novel mechanical prospects.

    更新日期:2018-06-18
  • Graphene oxide as an antimicrobial agent can extend the vase life of cut flowers
    Nano Res. (IF 7.994) Pub Date : 2018-06-16
    Yijia He, Lichao Qian, Xu Liu, Ruirui Hu, Meirong Huang, Yule Liu, Guoqiang Chen, Dusan Losic, Hongwei Zhu

    None

    更新日期:2018-06-16
  • Towards high-mobility In 2x Ga 2–2x O 3 nanowire field-effect transistors
    Nano Res. (IF 7.994) Pub Date : 2018-06-14
    Ziyao Zhou, Changyong Lan, SenPo Yip, Renjie Wei, Dapan Li, Lei Shu, Johnny C. Ho

    Recently, owing to the excellent electrical and optical properties, n-type In2O3 nanowires (NWs) have attracted tremendous attention for application in memory devices, solar cells, and ultra-violet photodetectors. However, the relatively low electron mobility of In2O3 NWs grown by chemical vapor deposition (CVD) has limited their further utilization. In this study, utilizing in-situ Ga alloying, highly crystalline, uniform, and thin In2xGa2−2xO3 NWs with diameters down to 30 nm were successfully prepared via ambient-pressure CVD. Introducing an optimal amount of Ga (10 at.%) into the In2O3 lattice was found to effectively enhance the crystal quality and reduce the number of oxygen vacancies in the NWs. A further increase in the Ga concentration adversely induced the formation of a resistive β-Ga2O3 phase, thereby deteriorating the electrical properties of the NWs. Importantly, when configured into global back-gated NW field-effect transistors, the optimized In1.8Ga0.2O3 NWs exhibit significantly enhanced electron mobility reaching up to 750 cm2·V–1·s–1 as compared with that of the pure In2O3 NW, which can be attributed to the reduction in the number of oxygen vacancies and ionized impurity scattering centers. Highly ordered NW parallel arrayed devices were also fabricated to demonstrate the versatility and potency of these NWs for next-generation, large-scale, and high-performance nanoelectronics, sensors, etc.

    更新日期:2018-06-14
  • A fast synthetic strategy for high-quality atomically thin antimonene with ultrahigh sonication power
    Nano Res. (IF 7.994) Pub Date : 2018-06-13
    Wanzhen Lin, Yaping Lian, Guang Zeng, Yanyan Chen, Zhenhai Wen, Huanghao Yang

    Recent theoretical studies revealed that two-dimensional (2D) antimonene has attractive characteristics, such as superior photothermal conductivity, absorption over a wide range, high mobility, and good spintronic properties. Herein, we report a reliable liquid phase exfoliation (LPE) route for the preparation of high-quality high-stability atomically thin (AT) antimonene via high ultrasonic power. The AT antimonene delivers a high specific capacity of up to 860 mA·h·g–1, with high rate capability and good cycling stability as an anode of a sodium ion battery (SIB). The good conductivity and 2D structure endow AT antimonene with more active sites for sodium storage, a facilitated pathway for electron transfer and mass transport, and the capability to reduce the volume expansion during the discharge–charge process.

    更新日期:2018-06-14
  • Investigation of charge carrier depletion in freestanding nanowires by a multi-probe scanning tunneling microscope
    Nano Res. (IF 7.994) Pub Date : 2018-06-11
    Andreas Nägelein, Matthias Steidl, Stefan Korte, Bert Voigtländer, Werner Prost, Peter Kleinschmidt, Thomas Hannappel

    None

    更新日期:2018-06-12
  • The shape effect of reconstituted high-density lipoprotein nanocarriers on brain delivery and Aβ clearance
    Nano Res. (IF 7.994) Pub Date : 2018-06-11
    Huahua Song, Xinyi Ma, Jianrong Xu, Qingxiang Song, Meng Hu, Xiao Gu, Qian Zhang, Lina Hou, Lepei Chen, Yukun Huang, Ping Yu, Dayuan Wang, Gan Jiang, Meng Huang, Jun Chen, Hongzhuan Chen, Xiaoling Gao

    None

    更新日期:2018-06-12
  • In situ fabrication of 2D SnS 2 nanosheets as a new electron transport layer for perovskite solar cells
    Nano Res. (IF 7.994) Pub Date : 2018-06-08
    Erling Zhao, Liguo Gao, Shuzhang Yang, Likun Wang, Junmei Cao, Tingli Ma

    To promote commercialization of perovskite solar cells (PSCs), low-temperature processed electron transport layer (ETL) with high carrier mobility still needs to be further developed. Here, we reported two-dimensional (2D) tin disulfide (SnS2) nanosheets as ETL in PSCs for the first time. The morphologies of the 2D SnS2 material can be easy controlled by the in situ synthesized method on the conductive fluorine-doped tin oxide (FTO) substrate. We achieved a champion power conversion efficiency (PCE) of 13.63%, with the short-circuit current density (JSC) of 23.70 mA/cm2, open-circuit voltage (VOC) of 0.95 V, and fill factor (FF) of 0.61. The high JSC of PSCs results from effective electron collection of the 2D SnS2 nanosheets from perovskite layer and fast electron transport to the FTO. The low VOC and FF are the results of the lower conduction band of 2D SnS2 (4.23 eV) than that of TiO2 (4.0 eV). These results demonstrate that 2D material is a promising candidate for ETL in PSCs.

    更新日期:2018-06-08
  • High-density lipoprotein mimetic nanotherapeutics for cardiovascular and neurodegenerative diseases
    Nano Res. (IF 7.994) Pub Date : 2018-06-08
    Song Ih Ahn, Hyun-Ji Park, Jiwon Yom, Taeyoung Kim, Yong Tae Kim

    High-density lipoprotein (HDL) serves as a natural nanoparticle with compositional and functional heterogeneity and contributes to the maintenance of lipid metabolism and various biological functions. HDL also transports endogenous microRNAs, vitamins, hormones, and proteins through blood and interstitial fluids to various organs. These unique and diverse features of HDL have encouraged its applications for the transport of therapeutics and diagnostic reagents in the last decade. In this review, we describe the heterogeneous characteristics and biological functions of HDL and highlight HDL mimetic approaches, including apolipoprotein mimetic peptides and reconstituted HDL nanoparticles. Given the potential of HDL as a nanocarrier delivering various therapeutic agents, we discuss the current representative studies of HDL mimetic nanotherapeutics for cardiovascular and neurodegenerative diseases and analyze the current challenges and future perspective.

    更新日期:2018-06-08
  • Curcumin-loaded polymeric nanoparticles for neuroprotection in neonatal rats with hypoxic-ischemic encephalopathy
    Nano Res. (IF 7.994) Pub Date : 2018-06-08
    Andrea Joseph, Thomas Wood, Chih-Chung Chen, Kylie Corry, Jessica M. Snyder, Sandra E. Juul, Pratik Parikh, Elizabeth Nance

    None

    更新日期:2018-06-08
  • Raman investigation of air-stable silicene nanosheets on an inert graphite surface
    Nano Res. (IF 7.994) Pub Date : 2018-06-05
    Paola Castrucci, Filippo Fabbri, Tiziano Delise, Manuela Scarselli, Matteo Salvato, Sara Pascale, Roberto Francini, Isabelle Berbezier, Christoph Lechner, Fatme Jardali, Holger Vach, Maurizio De Crescenzi

    The fascinating properties of two dimensional (2D) crystals have gained increasing interest for many applications. The synthesis of a 2D silicon structure, namely silicene, is attracting great interest for possible development of next generation electronic devices. The main difficulty in working with silicene remains its strong tendency to oxidation when exposed to air as a consequence of its relatively highly buckled structure. In this work, we univocally identify the Raman mode of air-stable low-buckled silicene nanosheets synthesized on highly oriented pyrolytic graphite (HOPG) located at 542.5 cm−1. The main focus of this work is Raman spectroscopy and mapping analyses in combination with ab initio calculations. Scanning tunneling microscopy images reveal the presence of a patchwork of Si three-dimensional (3D) clusters and contiguous Si areas presenting a honeycomb atomic arrangement, rotated by 30° with respect to the HOPG substrate underneath, with a lattice parameter of 0.41 ± 0.02 nm and a buckling of the Si atoms of 0.05 nm. Raman analysis supports the co-existence of 3D silicon clusters and 2D silicene. The Raman shift of low-buckled silicene on an inert substrate has not been reported so far and it is completely different from the one calculated for free-standing silicene and the ones measured for silicene grown on Ag(111) surfaces. Our experimental results are perfectly reproduced by our ab initio calculations of deposited silicene nanosheets. This leads us to conclude that the precise value of the observed Raman shift crucially depends on the strain between the silicene and the HOPG substrate.

    更新日期:2018-06-07
  • Design and in vivo characterization of kidney-targeting multimodal micelles for renal drug delivery
    Nano Res. (IF 7.994) Pub Date : 2018-06-06
    Jonathan Wang, Christopher Poon, Deborah Chin, Sarah Milkowski, Vivian Lu, Kenneth R. Hallows, Eun Ji Chung

    None

    更新日期:2018-06-06
  • Fabrication of zinc-based coordination polymer nanocubes and post-modification through copper decoration
    Nano Res. (IF 7.994) Pub Date : 2018-06-05
    Ngoc Minh Tran, Hien Duy Mai, Hyojong Yoo

    Coordination polymer particles (CPPs) with a high degree of porosity and multi-functional reaction sites are promising for diverse applications. The integration of open sites favorable for the post-modification of CPPs presents a unique opportunity for the rational design of inorganic materials with target-oriented functions. Herein, we report a shape-controllable synthetic protocol for zinc-based coordination polymer nanocubes (Zn-CPNs). In the synthesis, 2,6-bis[(4-carboxyanilino)carbonyl] pyridine ([N3]) ligand is employed as an efficient shape-directing modulator to control the size and shape of Zn-CPNs. More importantly, the [N3] ligand provides metal binding sites suitable for the decoration of other functional metals such as copper ions. The copper-modified Zn-CPNs (Cu_Zn-CPNs) show good activities in a heterogeneous catalytic reaction.

    更新日期:2018-06-06
  • Plasmonic molecular assays: Recent advances and applications for mobile health
    Nano Res. (IF 7.994) Pub Date : 2018-06-05
    Tao Yu, Qingshan Wei

    Plasmonics-based biosensing assays have been extensively employed for biomedical applications. Significant advancements in use of plasmonic assays for the construction of point-of-care (POC) diagnostic methods have been made to provide effective and urgent health care of patients, especially in resource-limited settings. This rapidly progressive research area, centered on the unique surface plasmon resonance (SPR) properties of metallic nanostructures with exceptional absorption and scattering abilities, has greatly facilitated the development of cost-effective, sensitive, and rapid strategies for disease diagnostics and improving patient healthcare in both developed and developing worlds. This review highlights the recent advances and applications of plasmonic technologies for highly sensitive protein and nucleic acid biomarker detection. In particular, we focus on the implementation and penetration of various plasmonic technologies in conventional molecular diagnostic assays, and discuss how such modification has resulted in simpler, faster, and more sensitive alternatives that are suited for point-of-use. Finally, integration of plasmonic molecular assays with various portable POC platforms for mobile health applications are highlighted.

    更新日期:2018-06-06
  • Composition-tuned oxidation levels of Pt–Re bimetallic nanoparticles for the etherification of allylic alcohols
    Nano Res. (IF 7.994) Pub Date : 2018-06-05
    Yuhao Wang, Lindong Li, Ke Wu, Rui Si, Lingdong Sun, Chunhua Yan

    The catalytic performance of metal nanoparticles is often affected by surface oxidation levels. Instead of post-synthesis oxidation/reduction, we propose an efficient method to modulate the oxidation levels by tuning the composition of bimetallic nanoparticles. Here we report a series of Pt–Re bimetallic nanoparticles synthesized via a facile thermal co-reduction process, with a uniform size of approximately 3 nm. The investigation of the growth of the Pt–Re nanoparticles suggests that the Re atoms were enriched on the surface, as confirmed by X-ray photoelectron spectroscopy. Furthermore, X-ray absorption spectroscopy showed that metallic Re was decreased and high-valency ReO x species were increased in particles with higher Re/Pt ratios. In the etherification of allylic alcohols catalyzed by Pt–Re nanoparticles of different compositions under ambient conditions, particles with higher Re/Pt ratios exhibited significantly better performances. The highest mass activity of Pt–Re bimetallic nanoparticles (127 μmol·g−1·s−1) was more than forty times that of the industrial catalyst CH3ReO3 (3 μmol·g−1·s−1). The catalytically active sites were associated with ReO x and could be tuned by adjusting the Pt ratio.

    更新日期:2018-06-06
  • Wafer-scale synthesis of monolayer WS 2 for high-performance flexible photodetectors by enhanced chemical vapor deposition
    Nano Res. (IF 7.994) Pub Date : 2018-05-22
    Changyong Lan, Ziyao Zhou, Zhifei Zhou, Chun Li, Lei Shu, Lifan Shen, Dapan Li, Ruoting Dong, SenPo Yip, Johnny C. Ho

    Two-dimensional (2D) nanomaterials have recently attracted considerable attention due to their promising applications in next-generation electronics and optoelectronics. In particular, the large-scale synthesis of high-quality 2D materials is an essential requirement for their practical applications. Herein, we demonstrate the wafer-scale synthesis of highly crystalline and homogeneous monolayer WS2 by an enhanced chemical vapor deposition (CVD) approach, in which precise control of the precursor vapor pressure can be effectively achieved in a multi-temperature zone horizontal furnace. In contrast to conventional synthesis methods, the obtained monolayer WS2 has excellent uniformity both in terms of crystallinity and morphology across the entire substrate wafer grown (e.g., 2 inches in diameter), as corroborated by the detailed characterization. When incorporated in typical rigid photodetectors, the monolayer WS2 leads to a respectable photodetection performance, with a responsivity of 0.52 mA/W, a detectivity of 4.9 × 109 Jones, and a fast response speed (< 560 μs). Moreover, once fabricated as flexible photodetectors on polyimide, the monolayer WS2 leads to a responsivity of up to 5 mA/W. Importantly, the photocurrent maintains 89% of its initial value even after 3,000 bending cycles. These results highlight the versatility of the present technique, which allows its applications in larger substrates, as well as the excellent mechanical flexibility and robustness of the CVD-grown, homogenous WS2 monolayers, which can promote the development of advanced flexible optoelectronic devices.

    更新日期:2018-06-03
  • Enabling silicon photoanodes for efficient solar water splitting by electroless-deposited nickel
    Nano Res. (IF 7.994) Pub Date : 2018-03-16
    Jiheng Zhao, Thomas Mark Gill, Xiaolin Zheng

    Enabling Si photoanodes for efficient solar water oxidation would facilitate the development of solar fuel conversion, but it is challenging owing to Si surface passivation via photo-induced corrosion in aqueous electrolytes. To overcome this challenge, most approaches have focused on improving the stability of Si by coating dense and thin protective layers using high vacuum-based techniques such as atomic layer deposition. However, these procedures are costly, making scalability for practical applications difficult. Herein, we report a modified electroless deposition (ELD) method to uniformly deposit protective and catalytic Ni films on Si wafers, resulting in efficient and stable Si photoanodes for solar water oxidation. The optimized Ni/n-Si photoanode achieves an onset potential of ∼ 1.09 V vs. a reversible hydrogen electrode and a saturation current density of ∼ 27.5 mA/cm2 under AM 1.5 G illumination at pH 14. The ELD method is additionally capable of Ni deposition on a 4-inch n-Si wafer, demonstrating the first 4-inch Si photoanode. The solar water oxidation of the ELD-Ni/n-Si photoanode can be further improved by surface texturing, built-in n–p junctions, or coupling with more efficient catalysts.

    更新日期:2018-06-03
  • Observation of unconventional anomalous Hall effect in epitaxial CrTe thin films
    Nano Res. (IF 7.994) Pub Date : 2018-05-22
    Dapeng Zhao, Liguo Zhang, Iftikhar Ahmed Malik, Menghan Liao, Wenqiang Cui, Xinqiang Cai, Cheng Zheng, Luxin Li, Xiaopeng Hu, Ding Zhang, Jinxing Zhang, Xi Chen, Wanjun Jiang, Qikun Xue

    We have studied the magnetic and electrical transport properties of epitaxial NiAs-type CrTe thin films grown on SrTiO3(111) substrates. Unlike rectangle hysteresis loops obtained from magnetic measurements, we have identified intriguing extra bump/dip features from anomalous Hall experiments on the films with thicknesses less than 12 nm. This observed Hall anomaly is phenomenologically consistent with the occurrence of a topological Hall effect(THE) in chiral magnets with a skyrmion phase. Furthermore, the THE contribution can be tuned by the film thickness, showing the key contribution of asymmetric interfaces in stabilizing Néel-type skyrmions. Our work demonstrates that a CrTe thin film on SrTiO3(111) substrates is a good material candidate for studying real-space topological transport.

    更新日期:2018-06-03
  • Stability and protection of nanowire devices in air
    Nano Res. (IF 7.994) Pub Date : 2018-05-22
    Zhen He, Muhammad Hassan, Huan-Xin Ju, Rui Wang, Jin-Long Wang, Jia-Fu Chen, Jun-Fa Zhu, Jian-Wei Liu, Shu-Hong Yu

    Nanowire devices have attracted considerable attention because of their unique structure and novel properties, and have opened up significant development opportunities. However, not many studies have focused on their stability and durability under practical conditions, which limits the rapid development of real applications. Herein, we systematically investigate three different treatments,polymer coating, inert atmosphere protection, and thickness-induced self-protection, to protect the tellurium nanowire devices from oxidation when exposed to open air. The degree of oxidation was monitored by examining changes in the valence states of tellurium element and in the morphology of the nanowires. After the protective treatments, the tellurium nanowire devices showed improved stability and remained stable even after 800 days of storage. This work highlights the importance of investigating the stability of nanowire devices, especially for their practical applications.

    更新日期:2018-06-03
  • Pt@h-BN core–shell fuel cell electrocatalysts with electrocatalysis confined under outer shells
    Nano Res. (IF 7.994) Pub Date : 2018-03-13
    Mengmeng Sun, Jinchao Dong, Yang Lv, Siqin Zhao, Caixia Meng, Yujiang Song, Guoxiong Wang, Jianfeng Li, Qiang Fu, Zhongqun Tian, Xinhe Bao

    Two-dimensional (2D) materials such as graphene and hexagonal boron nitride (h-BN) can be used as robust and flexible encapsulation overlayers, which effectively protect metal cores but allow reactions to occur between inner cores and outer shells. Here, we demonstrate this concept by showing that Pt@h-BN core–shell nanocatalysts present enhanced performances in H2/O2 fuel cells. Electrochemical (EC) tests combined with operando EC-Raman characterizations were performed to monitor the reaction process and its intermediates, which confirm that Pt-catalyzed electrocatalytic processes happen under few-layer h-BN covers. The confinement effect of the h-BN shells prevents Pt nanoparticles from aggregating and helps to alleviate the CO poisoning problem. Accordingly, embedding nanocatalysts within ultrathin 2D material shells can be regarded as an effective route to design high-performance electrocatalysts.

    更新日期:2018-06-03
  • Conversion of confined metal@ZIF-8 structures to intermetallic nanoparticles supported on nitrogen-doped carbon for electrocatalysis
    Nano Res. (IF 7.994) Pub Date : 2018-03-01
    Zhiyuan Qi, Yuchen Pei, Tian Wei Goh, Zhaoyi Wang, Xinle Li, Mary Lowe, Raghu V. Maligal-Ganesh, Wenyu Huang

    We report a facile strategy to synthesize intermetallic nanoparticle (iNP) electrocatalysts via one-pot pyrolysis of a zeolitic imidazolate framework, ZIF-8, encapsulating precious metal nanoparticles (NPs). ZIF-8 serves not only as precursor for N-doped carbon (NC), but also as Zn source for the formation of intermetallic or alloy NPs with the encapsulated metals. The resulting sub-4 nm PtZn iNPs embedded in NC exhibit high sintering resistance up to 1,000 °C. Importantly, the present methodology allows fine-tuning of both composition (e.g., PdZn and RhZn iNPs, as well as AuZn and RuZn alloy NPs) and size (2.4, 3.7, and 5.4 nm PtZn) of the as-formed bimetallic NPs. To the best of our knowledge, this is the first report of a metal-organic framework (MOF) with multiple functionalities, such as secondary metal source, carbon precursor, and size-regulating reagent, which promote the formation of iNPs. This work opens a new avenue for the synthesis of highly uniform and stable iNPs.

    更新日期:2018-06-03
  • Catalyzing polysulfide conversion by g-C 3 N 4 in a graphene network for long-life lithium-sulfur batteries
    Nano Res. (IF 7.994) Pub Date : 2018-03-08
    Meng Wang, Qinghua Liang, Junwei Han, Ying Tao, Donghai Liu, Chen Zhang, Wei Lv, Quan-Hong Yang

    The practical application of lithium-sulfur batteries with a high energy density has been plagued by the poor cycling stability of the sulfur cathode, which is a result of the insulating nature of sulfur and the dissolution of polysulfides. Much work has been done to construct nanostructured or doped carbon as a porous or polar host for promising sulfur cathodes, although restricting the polysulfide shuttle effect by improving the redox reaction kinetics is more attractive. Herein, we present a well-designed strategy by introducing graphitic carbon nitride (g-C3N4) into a three-dimensional hierarchical porous graphene assembly to achieve a synergistic combination of confinement and catalyzation of polysulfides. The porous g-C3N4 nanosheets in situ formed inside the graphene network afford a highly accessible surface to catalyze the transformation of polysulfides, and the hierarchical porous graphene-assembled carbon can function as a conductive network and provide appropriate space for g-C3N4 catalysis in the sulfur cathode. Thus, this hybrid can effectively improve sulfur utilization and block the dissolution of polysulfides, achieving excellent cycling performance for sulfur cathodes in lithium-sulfur batteries.

    更新日期:2018-06-03
  • Three-dimensional macroscale assembly of Pd nanoclusters
    Nano Res. (IF 7.994) Pub Date : 2018-05-22
    Kai Wang, Haifeng Lin, Bing Ni, Haoyi Li, Muhammad Aurang Zeb Gul Sial, Haozhou Yang, Jing Zhuang, Xun Wang

    Construction of macro-materials with highly oriented microstructures and well-connected interfaces between building blocks is significant for a variety of applications. However, it is still challenging to confine the desired structures. Thus, well-defined building blocks would be crucial to address this issue. Herein, we present a facile process based on 1.8 nm Pd nanoclusters (NCs) to achieve centimeter-size assemblages with aligned honeycomb structures, where the diameter of a single tubular moiety is ∼4 μm. Layered and disordered porous assemblages were also obtained by modulating the temperature in this system. The reconciled interactions between the NCs were crucial to the assemblages. As a comparison, 14 nm Pd nanoparticles formed only aggregates. This work highlights the approach of confining the size of the building blocks in order to better control the assembly process and improve the stability of the structures.

    更新日期:2018-05-22
  • Biomolecule-templated photochemical synthesis of silver nanoparticles: Multiple readouts of localized surface plasmon resonance for pattern recognition
    Nano Res. (IF 7.994) Pub Date : 2018-05-22
    Fang Pu, Xiang Ran, Meng Guan, Yanyan Huang, Jinsong Ren, Xiaogang Qu

    Silver nanoparticles (AgNPs) with distinct localized surface plasmon resonance (LSPR) absorption spectra can be synthesized using different proteins as templates upon irradiation by light. We utilized the multiple readouts of LSPR signals of AgNPs to construct sensor arrays for pattern recognition of proteins. Room temperature, aqueous solutions, and lack of harsh reducing reagents make the whole process inherently “green”. Meanwhile, the strategy efficiently simplified the process of array-receptor preparation and data acquisition, leading to lower time consumption, sample use, and cost. Furthermore, the system can differentiate proteins using flexible and alterable sensor elements by choosing different combinations of LSPR signals at different wavelengths. The principle of the sensor design can also be further extended to differentiate other biomolecules. The study provides a new method to construct feasible, economical, and general nanoparticle-based sensing arrays for pattern recognition.

    更新日期:2018-05-22
  • A strategy for accurate detection of glucose in human serum and whole blood based on an upconversion nanoparticles-polydopamine nanosystem
    Nano Res. (IF 7.994) Pub Date : 2018-05-22
    Yan Liu, Datao Tu, Wei Zheng, Lianyu Lu, Wenwu You, Shanyong Zhou, Ping Huang, Renfu Li, Xueyuan Chen

    The accurate detection of blood glucose is of critical importance in the diagnosis and management of diabetes and its complications. Herein, we report a novel strategy based on an upconversion nanoparticles-polydopamine (UCNPs-PDA) nanosystem for the accurate detection of glucose in human serum and whole blood through a simple blending of test samples with ligand-free UCNPs, dopamine, and glucose oxidase (GOx). Owing to the high affinity of lanthanide ions exposed on the surface of ligand-free UCNPs, dopamine monomers could spontaneously attach to the UCNPs and further polymerize to form a PDA shell, resulting in a remarkable upconversion luminescence (UCL) quenching (97.4%) of UCNPs under 980-nm excitation. Such UCL quenching can be effectively inhibited by H2O2 produced from the GOx/glucose enzymatic reaction, thus enabling the detection of H2O2 or glucose based on the UCL quenching/inhibition bioassay. Owing to the highly sensitive UCL response and background-free interference of the UCNPs-PDA nanosystem, we achieved a sensitive, selective, and high-throughput bioassay for glucose in human serum and whole blood, thereby revealing the great potential of the UCNPs-PDA nanosystem for the accurate detection of blood glucose or other H2O2-generated biomolecules in clinical bioassays.

    更新日期:2018-05-22
  • Facile synthesis of Pd concave nanocubes: From kinetics to mechanistic understanding and rationally designed protocol
    Nano Res. (IF 7.994) Pub Date : 2018-05-22
    Madeline Vara, Younan Xia

    We report a rationally designed one-pot method for the facile synthesis of Pd concave nanocubes in an aqueous solution at room temperature by manipulating the reduction kinetics through the selection of a proper combination of a salt precursor (PdBr42–) and reductant (sodium ascorbate). Our kinetic analysis demonstrates that, through this selection, the nucleation and growth of Pd nanocrystals could be effectively separated into two kinetic regimes involving distinctive reduction pathways: i) solution reduction for the initial formation of single-crystal seeds and ii) surface reduction for the formation of concave nanocrystals via autocatalytic growth from the single-crystal seeds. The suppressed surface diffusion at room temperature, when coupled with the capping effect of bromide ions, ultimately leads to the formation of concave nanocubes with an asymmetric shape and high-index facets, whose synthesis would otherwise require multiple steps and the use of elevated temperatures.

    更新日期:2018-05-22
  • Biomimetic approaches toward smart bio-hybrid systems
    Nano Res. (IF 7.994) Pub Date : 2018-02-15
    Zhiqiang Luo, Dara E. Weiss, Qingyun Liu, Bozhi Tian

    Bio-integrated materials and devices can blur the interfaces between living and artificial systems. Microfluidics, bioelectronics, and engineered nanostructures, with close interactions with biology at the cellular or tissue levels, have already yielded a spectrum of new applications. Many new designs emerge, including of organ-on-a-chip systems, biodegradable implants, electroceutical devices, minimally invasive neuro-prosthetic tools, and soft robotics. In this review, we highlight a few recent advances of the fabrication and application of smart bio-hybrid systems, with a particular emphasis on the three-dimensional (3D) bio-integrated devices that mimic the 3D feature of tissue scaffolds. Moreover,neurons integrated with engineered nanostructures for wireless neuromodulation and dynamic neural output are briefly discussed. We also discuss the progress in the construction of cell-enabled soft robotics, where a tight coupling of the synthetic and biological parts is crucial for efficient function. Finally, we summarize the approaches for enhancing bio-integration with biomimetic micro- and nanostructures.

    更新日期:2018-05-22
  • Dish-like higher-ordered palladium nanostructures through metal ion-ligand complexation
    Nano Res. (IF 7.994) Pub Date : 2018-02-02
    Xi Yin, Miao Shi, Kam Sang Kwok, Haidong Zhao, Danielle L. Gray, Jeffery A. Bertke, Hong Yang

    Unlike nucleation and growth in simple precipitation processes, described by the classical theory, metal nanoparticles formed in organic solvents with capping ligands often involve chemical reactions that occur homogeneously in solution or heterogeneously on the metal surface. These chemical reactions lead to the formation of intermediates that occurs in the process of deposition onto nuclei during the reduction. The understanding of these chemical reactions would enable a better design of functional metal nanocrystals, even those with unconventional hierarchical morphologies. In this study, we report the formation of dish-shaped nanostructures of palladium (Pd) obtained from palladium acetylacetonate (Pd(acac)2) in the presence of oleylamine and oleic acid. The process was correlated with the kinetic-controlled evolution of two-dimensional (2D) Pd nanosheets. The formation of Pd-ligand complexes was revealed using single-crystal X-ray diffraction, ultraviolet-visible spectroscopy, and mass spectrometry. These intermediates affected the formation kinetics of the 2D nanostructures and higher-ordered morphology of the nanodishes.

    更新日期:2018-05-22
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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