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  • Enhanced microwave absorption performance of highly dispersed CoNi nanostructures arrayed on graphene
    Nano Res. (IF 7.354) Pub Date : 2017-11-20
    Genban Sun, Hong Wu, Qingliang Liao, Yue Zhang

    None

    更新日期:2017-11-20
  • Self-assembly of peptide-based nanostructures: Synthesis and biological activity
    Nano Res. (IF 7.354) Pub Date : 2017-11-20
    Léna Guyon, Elise Lepeltier, Catherine Passirani

    None

    更新日期:2017-11-20
  • Soft thermal nanoimprint lithography using a nanocomposite mold
    Nano Res. (IF 7.354) Pub Date : 2017-11-17
    Viraj Bhingardive, Liran Menahem, Mark Schvartzman

    None

    更新日期:2017-11-19
  • High-performance sub-10-nm monolayer black phosphorene tunneling transistors
    Nano Res. (IF 7.354) Pub Date : 2017-11-17
    Hong Li, Jun Tie, Jingzhen Li, Meng Ye, Han Zhang, Xiuying Zhang, Yuanyuan Pan, Yangyang Wang, Ruge Quhe, Feng Pan, Jing Lu

    None

    更新日期:2017-11-19
  • Sodium-doped carbon nitride nanotubes for efficient visible light-driven hydrogen production
    Nano Res. (IF 7.354) Pub Date : 2017-11-15
    Longshuai Zhang, Ning Ding, Muneaki Hashimoto, Koudai Iwasaki, Noriyasu Chikamori, Kazuya Nakata, Yuzhuan Xu, Jiangjian Shi, Huijue Wu, Yanhong Luo, Dongmei Li, Akira Fujishima, Qingbo Meng

    Sodium-doped carbon nitride nanotubes (Nax-CNNTs) were prepared by a green and simple two-step method and applied in photocatalytic water splitting for the first time. Transmission electron microscopy (TEM) element mapping and X-ray photoelectron spectroscopy (XPS) measurements confirm that sodium was successfully introduced in the carbon nitride nanotubes (CNNTs), and the intrinsic structure of graphitic carbon nitride (g-C3N4) was also maintained in the products. Moreover, the porous structure of the CNNTs leads to relatively large specific surface areas. Photocatalytic tests indicate that the porous tubular structure and Na+ doping can synergistically enhance the hydrogen evolution rate under visible light (λ > 420 nm) irradiation in the presence of sacrificial agents, leading to a hydrogen evolution rate as high as 143 μmol·h−1 (20 mg catalyst). Moreover, other alkali metal-doped CNNTs, such as Lix-CNNTs and Kx-CNNTs, were tested; both materials were found to enhance the hydrogen evolution rate, but to a lower extent compared with the Nax-CNNTs. This highlights the general applicability of the present method to prepare alkali metal-doped CNNTs; a preliminary mechanism for the photocatalytic hydrogen evolution reaction in the Nax-CNNTs is also proposed.

    更新日期:2017-11-15
  • Coordination-responsive drug release inside gold nanorod@metal-organic framework core–shell nanostructures for near-infrared-induced synergistic chemo-photothermal therapy
    Nano Res. (IF 7.354) Pub Date : 2017-11-14
    Yantao Li, Jun Jin, Dawei Wang, Jiawei Lv, Ke Hou, Yaling Liu, Chunying Chen, Zhiyong Tang

    Multifunctional core–shell nanostructures formed by integration of distinct components have received wide attention as promising biological platforms inrecent years. In this work, crystalline zeolitic imidazolate framework-8 (ZIF-8), a typical metal-organic framework (MOF), is coated onto single gold nanorod(AuNR) core for successful realization of synergistic photothermal andchemotherapy triggered by near-infrared (NIR) light. Impressively, high doxorubicin hydrochloride (DOX) loading capacity followed by pH and NIR light dual stimuli-responsive DOX release can be easily implemented throughformation and breakage of coordination bonds in the system. Moreover, underNIR laser irradiation at 808 nm, these novel AuNR@MOF core–shell nanostructures exhibit effective synergistic chemo-photothermal therapy both in vitro and in vivo, confirmed by cell treatment and tumor ablation viaintravenous injection.

    更新日期:2017-11-15
  • Unraveling giant Cu(110) surface restructuring induced by a non-planar phthalocyanine
    Nano Res. (IF 7.354) Pub Date : 2017-11-10
    Nataliya Kalashnyk, Luke A. Rochford, Dongzhe Li, Alexander Smogunov, Yannick J. Dappe, Tim S. Jones, Laurent Guillemot

    The surface stability of coinage metals is paramount when they are used as electrode materials for functional electronic devices incorporating organic semiconductors. In this work, it is shown that the adsorption of non-planar vanadyl phthalocyanine molecules on Cu(110) drastically restructured the metal surface at room temperature, which was further enhanced upon moderate annealing. Scanning tunneling microscopy imaging demonstrated that the surface was restructured at step edges into sawtooth features that gradually replaced the (110) terraces. The edges of the modified steps were preferentially composed of chiral (1×6) kink sites decorated with vanadyl phthalocyanine molecules adsorbed in a tilted configuration with the oxygen atom pointing downwards. These results can have a strong impact on the optimization of the performance of organic devices integrated with phthalocyanine molecules.

    更新日期:2017-11-10
  • Deciphering active biocompatibility of iron oxide nanoparticles from their intrinsic antagonism
    Nano Res. (IF 7.354) Pub Date : 2017-11-10
    Lu Wang, Zejun Wang, Xiaoming Li, Yi Zhang, Min Yin, Jiang Li, Haiyun Song, Jiye Shi, Daishun Ling, Lihua Wang, Nan Chen, Chunhai Fan

    Magnetite nanoparticles (Fe3O4 NPs) are a well proven biocompatible nanomaterial, which hold great promise in various biomedical applications. Interestingly, unlike conventional biocompatible materials (e.g., polyethylene glycol (PEG)) that are chemically and biologically inert in nature, Fe3O4 NPs are known to be catalytically active and exhibit prominent physiological effects. Herein, we report an “active”, dynamic equilibrium mechanism for maintaining the cellular amenity of Fe3O4 NPs. We examined the effects of two types of iron oxide (magnetite and hematite) NPs in rat pheochromocytoma (PC12) cells and found that both induced stress responses. However, only Fe2O3 NPs caused significant programmed cell death; whereas Fe3O4 NPs are amenable to cells. We found that intrinsic catalase-like activity of Fe3O4 NPs antagonized the accumulation of toxic reactive oxygen species (ROS) induced by themselves, and thereby modulated the extent of cellular oxidative stress, autophagic activity, and programmed cell death. In line with this observation, we effectively reversed severe autophagy and cell death caused by Fe2O3 NPs via co-treatment with natural catalase. This study not only deciphers the distinct intrinsic antagonism of Fe3O4 NPs, but opens new routes to designing biocompatible theranostic nanoparticles with novel mechanisms.

    更新日期:2017-11-10
  • Antarctic thermolabile uracil-DNA-glycosylase-supplemented multiple cross displacement amplification using a label-based nanoparticle lateral flow biosensor for the simultaneous detection of nucleic acid sequences and elimination of carryover contamination
    Nano Res. (IF 7.354) Pub Date : 2017-11-09
    Yi Wang, Hui Li, Yan Wang, Huaqing Xu, Jianguo Xu, Changyun Ye

    Here, we report a novel and universal methodology, termed “Antarctic thermolabile uracil-DNA-glycosylase (AUDG)-supplemented nucleic acid amplification techniques (NAAs) using a labeled-based nanoparticle lateral flow biosensor (LFB)” (AUDG-NAAs-LFB), which merges enzymatic (AUDG) digestion of contaminant amplicons with different nucleic acid amplification techniques (NAAs), and uses a lateral flow biosensor (LFB) for the rapid and visual confirmation of the presence of a target nucleic acid sequence. AUDG-NNAs-LFB is a one-pot, closedvessel assay, that can effectively eliminate false-positive signals arising from either carryover contaminants or the interaction between labeled primers. A new LFB was devised for detecting three targets (two amplicons generated from amplification of target sequences, and a chromatography control), without the need for probe-hybridization or additional incubation steps. As a proof of concept, multiple cross displacement amplification (MCDA), which is a specific, sensitive, and rapid isothermal amplification method, was selected as the model amplification technique to demonstrate the feasibility of AUDG-NAAs-LFB. As a result, we demonstrate the applicability of the AUDG-MCDA-LFB method for simultaneously detecting high-risk human papillomaviruses genotypes 16 and 18, which are the most and second-most prevalent strains of the virus reported in women worldwide. We also confirm the principle behind the AUDG-MCDA-LFB assay and validate its sensitivity, reproducibility, and specificity using serial dilutions of the type-specific plasmids, as well as clinical samples. This proof-of-concept method (AUDG-MCDA-LFB) can be easily reconfigured to detect various nucleic acid sequences by redesigning the specific MCDA primers.

    更新日期:2017-11-10
  • Enhanced O 2 reduction on atomically thin Pt-based nanoshells by integrating surface facet, interfacial electronic, and substrate stabilization effects
    Nano Res. (IF 7.354) Pub Date : 2017-11-09
    Wei Ye, Zhongti Sun, Chengming Wang, Mengshan Ye, Chenhao Ren, Ran Long, Xusheng Zheng, Junfa Zhu, Xiaojun Wu, Yujie Xiong

    To fully realize the commercial viability of Pt in fuel cells, the usage of scarce Pt must be reduced while the activity and durability in O2 reduction reaction (ORR) must be enhanced. Here we report a metallic stack design achieving these goals for ORR, based on atomically precise materials synthesis. Au@Pd@Pt nanostructures with atomically thin Pt shells and high-index surfaces form an excellent platform for integrating the effects of electronic structures, surface facets, and substrate stabilization to boost ORR performance. Au@Pd@Pt trisoctahedrons (TOH) achieve mass activity 6.1 times higher than that of commercial Pt/C and dramatically enhanced durability beyond 1.0 V vs. a reversible hydrogen electrode in oxidation potential. Meanwhile, Pt comprises only 3.2% of the nanostructures. To further improve the ORR activity and demonstrate the versatility of our strategy, we implement the same design in PtNi alloy electrocatalysts. The Au@Pd@PtNi TOHs exhibit mass activity 14.3 times higher than that of commercial Pt/C as well as excellent durability. This work demonstrates an alternative strategy for fabricating high-performance and low-cost catalysts, and highlights the importance of simultaneous surface and interfacial engineering with atomic precision in designing catalysts.

    更新日期:2017-11-10
  • Silicon nanowire CMOS NOR logic gates featuring one-volt operation on bendable substrates
    Nano Res. (IF 7.354) Pub Date : 2017-11-07
    Jeongje Moon, Yoonjoong Kim, Doohyeok Lim, Sangsig Kim

    None

    更新日期:2017-11-10
  • Amorphous red phosphorus anchored on carbon nanotubes as high performance electrodes for lithium ion batteries
    Nano Res. (IF 7.354) Pub Date : 2017-11-07
    Li Sun, Yu Zhang, Deyang Zhang, Jingang Liu, Yihe Zhang

    None

    更新日期:2017-11-10
  • Reversible hydrogels with tunable mechanical properties for optically controlling cell migration
    Nano Res. (IF 7.354) Pub Date : 2017-11-07
    Xin Wu, Wenmao Huang, Wen-Hao Wu, Bin Xue, Dongfang Xiang, Ying Li, Meng Qin, Fei Sun, Wei Wang, Wen-Bin Zhang, Yi Cao

    Synthetic hydrogels are widely used as biomimetic in vitro model systems to understand how cells respond to complex microenvironments. The mechanical properties of hydrogels are deterministic for many cellular behaviors, including cell migration, spreading, and differentiation. However, it remains a major challenge to engineer hydrogels that recapture the dynamic mechanical properties of native extracellular matrices. Here, we provide a new hydrogel platform with spatiotemporally tunable mechanical properties to assay and define cellular behaviors under light. The change in the mechanical properties of the hydrogel is effected by a photo-induced switch of the cross-linker fluorescent protein, Dronpa145N, between the tetrameric and monomeric states, which causes minimal changes to the chemical properties of the hydrogel. The mechanical properties can be rapidly and reversibly tuned for multiple cycles using visible light, as confirmed by rheological measurements and atomic force microscopybased nano-indentation. We further demonstrated real-time and reversible modulation of cell migration behaviors on the hydrogels through photo-induced stiffness switching, with minimal invasion to the cultured cells. Hydrogels with a programmable mechanical history and a spatially defined mechanical hierarchy might serve as an ideal model system to better understand complex cellular functions.

    更新日期:2017-11-10
  • Doxorubicin-loaded silicon nanoparticles impregnated into red blood cells featuring bright fluorescence, strong photostability, and lengthened blood residency
    Nano Res. (IF 7.354) Pub Date : 2017-11-07
    Airui Jiang, Bin Song, Xiaoyuan Ji, Fei Peng, Houyu Wang, Yuanyuan Su, Yao He

    None

    更新日期:2017-11-10
  • Rod-shaped thiocyanate-induced abnormal band gap broadening in SCN − doped CsPbBr 3 perovskite nanocrystals
    Nano Res. (IF 7.354) Pub Date : 2017-11-07
    Yongbing Lou, Yandan Niu, Dongwen Yang, Qiaoling Xu, Yuhang Hu, Ying Shen, Jing Ming, Jinxi Chen, Lijun Zhang, Yixin Zhao

    None

    更新日期:2017-11-10
  • Strong contact coupling of neuronal growth cones withheight-controlled vertical silicon nanocolumns
    Nano Res. (IF 7.354) Pub Date : 2017-11-07
    Seong-Min Kim, Seyeong Lee, Dongyoon Kim, Dong-Hee Kang, Kisuk Yang, Seung-Woo Cho, Jin Seok Lee, Insung S. Choi, Kyungtae Kang, Myung-Han Yoon

    In this study, we report that height-controlled vertically etched silicon nano-column arrays (vSNAs) induce strong growth cone-to-substrate coupling and accelerate In vitroneurite development while preserving the essential featuresof initial neurite formation. Large-scale preparation of vSNAs with flat head morphology enabled the generation of well-controlled topographical stimulation without cellular impalement. A systematic analysis on topography-induced variations on cellular morphology and cytoskeletal dynamics wasconducted. In addition, neurite development on the grid-patterned vSNAs exhibited preferential adhesion to the nanostructured region and outgrowthdirectionality. The arrangement of cytoskeletal proteins and the expression of afocal adhesion complex indicated that a strong coupling existedbetween the underlying nanocolumns and growth cones. Furthermore, the height-controlled nanocolumn substrates differentially modulated neurite polarization and elongation. Our findings provide an important insight into neuron-nanotopographyinteractions and their role in cell adhesion and neurite development.

    更新日期:2017-11-10
  • High-purity helical carbon nanotubes by trace-water-assisted chemical vapor deposition: Large-scale synthesis and growth mechanism
    Nano Res. (IF 7.354) Pub Date : 2017-11-07
    Fanbin Meng, Ying Wang, Qiang Wang, Xiaoling Xu, Man Jiang, Xuesong zhou, Ping He, Zuowan Zhou

    None

    更新日期:2017-11-10
  • Programmable DNA-responsive microchip for the capture and release of circulating tumor cells by nucleic acid hybridization
    Nano Res. (IF 7.354) Pub Date : 2017-11-07
    Shan Guo, Haiyan Huang, Xujing Deng, Yuqi Chen, Zhuoran Jiang, Min Xie, Songmei Liu, Weihua Huang, Xiang Zhou

    None

    更新日期:2017-11-10
  • Remarkably enhanced water splitting activity of nickel foam due to simple immersion in a ferric nitrate solution
    Nano Res. (IF 7.354) Pub Date : 2017-11-06
    Huajie Yin, Lixue Jiang, Porun Liu, Mohammad Al-Mamun, Yun Wang, Yu Lin Zhong, Huagui Yang, Dan Wang, Zhiyong Tang, Huijun Zhao

    The development of a facile method to construct a high-performance electrode is of paramount importance to the application of alkaline water electrolysis. Here, we report that the activity of nickel foam (NF) towards the oxygen evolution reaction (OER) can be enhanced remarkably through simple immersion in a ferric nitrate (Fe(NO3)3) solution at room temperature. During this immersion process, the oxidation of the NF surface by NO3− ions increases the near-surface concentrations of OH− and Ni2+, which results in the in situ deposition of a highly active amorphous Ni-Fe hydroxide (a-NiFeOxHy) layer. Specifically, the OER overpotential of the NF electrode decreases from 371 mV (bare NF) to 270 mV (@10 mA·cm−2 in 0.1 M KOH) after immersion in a 20 mM Fe(NO3)3 solution for just 1 min. A longer immersion time results in further increased OER activity (196 mV@10 mA·cm−2 in 1 M KOH). The overall water splitting properties of the a-NiFeOxHy@NF electrode were evaluated using a two-electrode configuration. It is worth noting that the current density can reach 25 mA·cm−2 in 6 M KOH at an applied voltage of 1.5 V at room temperature.

    更新日期:2017-11-10
  • InP/GaInP nanowire tunnel diodes
    Nano Res. (IF 7.354) Pub Date : 2017-11-06
    Xulu Zeng, Gaute Otnes, Magnus Heurlin, Renato T. Mourão, Magnus T. Borgström

    Semiconductor nanowire (NW) solar cells with a single p-n junction have exhibited efficiency comparable to that of their planar counterparts with a substantial reduction in material consumption. Tandem geometry is a path toward the fabrication of devices with even higher efficiencies, for which a key step is the fabrication of tunnel (Esaki) diodes within NWs with the correct diameter, pitch, and material combination for maximized efficiency. InP/GaInP and GaInP/InP NW tunnel diodes with band gap combinations corresponding to high-efficiency solar energy harvesting were fabricated and their electrical characteristics and material properties were compared. Four different configurations, with respect to material composition and doping, were investigated. The NW arrays were grown with metal–organic vapor-phase epitaxy from Au particles by use of nano-imprint lithography, metal evaporation and lift-off. Electrical measurements showed that the NWs behave as tunnel diodes in both InP (bottom)/GaInP (top) and GaInP (bottom)/InP (top) configurations, exhibiting a maximum peak current density of 25 A/cm2, and maximum peak to valley current ratio of 2.5 at room temperature. The realization of NW tunnel diodes in both InP/GaInP and GaInP/InP configurations represent an opportunity for the use of NW tandem solar cells, whose efficiency is independent of the growth order of the different materials, increasing the flexibility regarding dopant incorporation polarity.

    更新日期:2017-11-10
  • Silicon nanowire ratioed inverters on bendable substrates
    Nano Res. (IF 7.354) Pub Date : 2017-11-06
    Jeongje Moon, Yoonjoong Kim, Doohyeok Lim, Kyeungmin Im, Sangsig Kim

    In this study, we demonstrate the performance of silicon nanowire (SiNW)n-metal oxide semiconductor (MOS) and p-MOS ratioed inverters that are fabricated on bendable substrates. The electrical characteristics of the fabricateddevices can be controlled by adjusting the load voltage. The logic swings of then- and p-MOS ratioed inverters at a low supply voltage of 1 V are 80% and 96%, respectively. The output voltage level of the p-MOS ratioed inverter is close to rail-to-rail operation. The device also exhibits stable characteristics with goodfatigue properties. Our bendable SiNW ratioed inverters show promise asa candidate building block for future bendable electronics.

    更新日期:2017-11-10
  • Plasmon resonant amplification of a hot electron-driven photodiode
    Nano Res. (IF 7.354) Pub Date : 2017-11-06
    Lang Shen, Nirakar Poudel, George N. Gibson, Bingya Hou, Jihan Chen, Haotian Shi, Ernest Guignon, William D. Page, Arturo Pilar, Stephen B. Cronin

    We report plasmon resonant excitation of hot electrons in a photodetector based on a metal/oxide/metal (Au/Al2O3/graphene) heterostructure. In this device, hot electrons, excited optically in the gold layer, jump over the oxide barrier and are injected into the graphene layer, producing a photocurrent. To amplify this process, the bottom gold electrode is patterned into a plasmon resonant grating structure with a pitch of 500 nm. The photocurrent produced in this device is measured using 633-nm-wavelength light as a function of incident angle. We observe the maximum photocurrent at ±10° from normal incidence under irra-diation with light polarized parallel to the incident plane (p-polarization) and perpendicular to the lines on the grating, and a constant (angle-independent) photocurrent under irradiation with light polarized perpendicular to the incident plane (s-polarization) and parallel to the grating. These data show an amplification factor of 4.6× under resonant conditions. At the same angle (±10°), we also observe sharp dips in the photoreflectance corresponding to waveve-ctor matching between the incident light and the plasmon mode in the grating. In addition, finite-difference time-domain simulations predict sharp dips in the photoreflectance at ±10°, and the electric field intensity profiles show clear excitation of a plasmon resonant mode when illuminated with p-polarized light at this angle.

    更新日期:2017-11-10
  • Plasma-processed homogeneous magnesium hydride/carbon nanocomposites for highly stable lithium storage
    Nano Res. (IF 7.354) Pub Date : 2017-11-04
    Xinghua Chang, Xinyao Zheng, Yanru Guo, Jun Chen, Jie Zheng, Xingguo Li

    None

    更新日期:2017-11-10
  • One-pot synthesis of interconnected Pt 95 Co 5 nanowires with enhanced electrocatalytic performance for methanol oxidation reaction
    Nano Res. (IF 7.354) Pub Date : 2017-11-04
    Qingqing Lu, Litai Sun, Xue Zhao, Jianshe Huang, Ce Han, Xiurong Yang

    None

    更新日期:2017-11-10
  • One-pot synthesis of Pt−Cu bimetallic nanocrystals with different structures and their enhanced electrocatalytic properties
    Nano Res. (IF 7.354) Pub Date : 2017-11-04
    Daowei Gao, Shuna Li, Guolong Song, Pengfei Zha, Cuncheng Li, Qin Wei, Yipin Lv, Guozhu Chen

    None

    更新日期:2017-11-10
  • Erratum to: Charge transfer in graphene/polymer interfaces for CO 2 detection
    Nano Res. (IF 7.354) Pub Date : 2017-11-03
    Kihyeun Kim, Myungwoo Son, Yusin Pak, Sang-Soo Chee, Francis Malar Auxilia, Byung-Kee Lee, Sungeun Lee, Sun Kil Kang, Chaedeok Lee, Jeong Soo Lee, Ki Kang Kim, Yun Hee Jang, Byoung Hun Lee, Gun-Young Jung, Moon-Ho Ham

    The order of the authors in the original version of this article was unfortunately incorrect on the first page and the first page of the ESM. Instead of Myungwoo Son1, Yusin Pak1, Sang-Soo Chee1, Francis Malar Auxilia1, Kihyeun Kim1, Byung-Kee Lee2, Sungeun Lee2, Sun Kil Kang2, Chaedeok Lee2, Jeong Soo Lee2, Ki Kang Kim3, Yun Hee Jang4, Byoung Hun Lee1, Gun-Young Jung1 (✉), and Moon-Ho Ham1 (✉) It should read Kihyeun Kim1,§, Myungwoo Son1,§, Yusin Pak1, Sang-Soo Chee1, Francis Malar Auxilia1, Byung-Kee Lee2, Sungeun Lee2, Sun Kil Kang2, Chaedeok Lee2, Jeong Soo Lee2, Ki Kang Kim3, Yun Hee Jang4, Byoung Hun Lee1, Gun-Young Jung1 (✉), and Moon-Ho Ham1 (✉)

    更新日期:2017-11-10
  • Polarized few-layer g-C 3 N 4 as metal-free electrocatalyst for highly efficient reduction of CO 2
    Nano Res. (IF 7.354) Pub Date : 2017-10-14
    Bing Zhang, Tian-Jian Zhao, Wei-Jie Feng, Yong-Xing Liu, Hong-Hui Wang, Hui Su, Li-Bing Lv, Xin-Hao Li, Jie-Sheng Chen

    The greenhouse effect and global warming are serious problems because the increasing global demand for fossil fuels has led to a rapid rise in greenhouse gas exhaust emissions in the atmosphere and disruptive changes in climate. As a major contributor, CO2 has attracted much attention from scientists, who have attempted to convert it into useful products by electrochemical or photoelectrochemical reduction methods. Facile design of efficient but inexpensive and abundant catalysts to convert CO2 into fuels or valuable chemical products is essential for materials chemistry and catalysis in addressing global climate change as well as the energy crisis. Herein, we show that two-dimensional fewlayer graphitic carbon nitride (g-C3N4) can function as an efficient metal-free electrocatalyst for selective reduction of CO2 to CO at low overpotentials with a high Faradaic efficiency of ~ 80%. The polarized surface of ultrathin g-C3N4 layers (thickness: ~ 1 nm), with a more reductive conduction band, yields excellent electrochemical activity for CO2 reduction.

    更新日期:2017-10-16
  • Surface-floating gold nanorod super-aggregates with macroscopic uniformity
    Nano Res. (IF 7.354) Pub Date : 2017-10-12
    Abdul R. Ferhan, Youju Huang, Anirban Dandapat, Dong-Hwan Kim

    We present a simple method for obtaining high-density two- and threedimensional assemblies of gold nanorods (AuNRs) on polymer brush, referred to as “surface-floating super-aggregates”, with uniform distribution spanning macroscopic distances. This was achieved via the single-step immersion of a poly(oligo ethylene glycol methacrylate) brush-containing substrate in a AuNR solution without any form of functionalization. Owing to extensive macroscale plasmonic coupling, we observed for the first time the gradual evolution of a unique sharp peak in addition to the transverse and longitudinal peaks, in this case, in the near-infrared (NIR) region. We also highlight the dynamic nature of these surface-floating super-aggregates, in which the AuNRs spread out when immersed in solution and collapse when dried to facilitate the access of probe molecules for biosensing applications. As a proof of concept, the surface-floating super-aggregates were used for surface-enhanced Raman spectroscopy, with which we detected rhodamine 6G at as low as sub-femtomolar concentrations. Owing to the excellent large-area uniform coverage and extreme simplicity of the fabrication method, such AuNR assemblies can easily be mass-produced and incorporated into cheap biosensors suitable for consumer use in the near future.

    更新日期:2017-10-14
  • Charge transfer in graphene/polymer interfaces for CO 2 detection
    Nano Res. (IF 7.354) Pub Date : 2017-10-12
    Myungwoo Son, Yusin Pak, Sang-Soo Chee, Francis Malar Auxilia, Kihyeun Kim, Byung-Kee Lee, Sungeun Lee, Sun Kil Kang, Chaedeok Lee, Jeong Soo Lee, Ki Kang Kim, Yun Hee Jang, Byoung Hun Lee, Gun-Young Jung, Moon-Ho Ham

    Understanding charge transfer processes between graphene and functional materials is crucial from the perspectives of fundamental sciences and potential applications, including electronic devices, photonic devices, and sensors. In this study, we present the charge transfer behavior of graphene and amine-rich polyethyleneimine (PEI) upon CO2 exposure, which was significantly improved after introduction of hygroscopic polyethylene glycol (PEG) in humid air. By blending PEI and PEG, the number of protonated amine groups in PEI was remarkably increased in the presence of water molecules, leading to a strong electron doping effect on graphene. The presence of CO2 gas resulted in a large change in the resistance of PEI/PEG-co-functionalized graphene because of the dramatic reduction of said doping effect, reaching a maximum sensitivity of 32% at 5,000 ppm CO2 and an applied bias of 0.1 V in air with 60% relative humidity at room temperature. This charge transfer correlation will facilitate the development of portable graphene-based sensors for real-time gas detection and the extension of the applications of graphene-based electronic and photonic devices.

    更新日期:2017-10-14
  • Utilizing the full capacity of carbon black as anode for Na-ion batteries via solvent co-intercalation
    Nano Res. (IF 7.354) Pub Date : 2017-10-12
    Wei Xiao, Qian Sun, Jian Liu, Biwei Xiao, Per-Anders Glans, Jun Li, Ruying Li, Jinghua Guo, Wanli Yang, Tsun-Kong Sham, Xueliang Sun

    Carbonaceous materials have long been considered promising anode materials for Na-ion batteries. However, the electrochemical performance of conventional carbon anodes is generally poor because the sodium ion storage solely relies on the disordered region of the carbon materials in a carbonate-based electrolyte. The solvent co-intercalation mechanism for Na ions has been recently reported in natural graphite anodes for Na-ion batteries with ether-based electrolytes, but their capacities are still unsatisfactory. We show here for the first time that by combining regular Na ion storage in the disordered carbon layer and solvent co-intercalation mechanism in the graphitized layer of a commercial N330 carbon black as an anode material for Na-ion batteries in ether-based electrolyte, the reversible capacity could be fully realized and doubled in magnitude. This unique sodium intercalation process resulted in a significantly improved electrochemical performance for the N330 electrode with an initial reversible capacity of 234 mAh·g–1 at 50 mA·g–1 and a superior rate capability of 105 mAh·g–1 at 3,200 mA·g–1. When cycled at 3,200 mA·g–1 over 2,000 cycles, the electrode still exhibited a highly reversible capacity of 72 mAh·g–1 with a negligible capacity loss per cycle (0.0167%). Additionally, surface-sensitive C K-edge X-ray absorption spectroscopy, with the assistance of electrochemical and physicochemical characterizations, helped in identifying the controlled formation and evolution of a thin and robust solid electrolyte interphase film. This film not only reduced the resistance for sodium ion diffusion, but also maintained the structural stability of the electrode for extended cycle reversibility. The superior electrochemical performance of N330 carbon black strongly demonstrated the potential of applying ether-based electrolytes for a wide range of carbon anodes apart from natural graphite.

    更新日期:2017-10-13
  • Development of polyimide films reinforced with boron nitride and boron nitride nanosheets for transparent flexible device applications
    Nano Res. (IF 7.354) Pub Date : 2017-10-12
    You Jin Min, Kyeong-Hee Kang, Dae-Eun Kim

    The benefits of reinforcing polyimide (PI) films with boron nitride (BN) particles and boron nitride nanosheets (BNNSs) were assessed with the aim of enhancing their thermal, optical, and mechanical properties for flexible device applications. BNNSs were prepared from BN particles using a liquid-phase exfoliation method assisted by an ultrasonic probe-type sonicator and centrifugator. PI-based composite films blended with BNNSs and BN particles were fabricated at various concentrations via mechanical stirring and spin coating. The transparency of the PI/BNNS composite films remained almost the same as that of pure PI films up to 3 wt.% whereas the transparency of the PI/BN composite films decreased with increasing concentration of the BN fillers at 550 nm. The thermal stability improved significantly with increasing concentrations of both BN and BNNS relative to that of pure PI films. The temperature for 5% weight loss of the PI/BNNS composite film was higher than that of the PI/BN composite film at the same filler concentration. The composite films with 2 wt.% BN or BNNS showed the lowest wear rate, and the PI/BNNS composite films showed more stable frictional behavior compared to the PI/BN composite films. In addition, bending tests showed that the PI/BNNS composite films exhibited excellent flexibility compared to the PI/BN composite films. Overall, the results indicate that the BNNS can be effectively used as a filler that can enhance the thermal and mechanical properties of polymer materials for flexible device applications.

    更新日期:2017-10-13
  • Integrative square-grid triboelectric nanogenerator as a vibrational energy harvester and impulsive force sensor
    Nano Res. (IF 7.354) Pub Date : 2017-10-03
    Chuan He, Weijun Zhu, Guang Qin Gu, Tao Jiang, Liang Xu, Bao Dong Chen, Chang Bao Han, Dichen Li, Zhong Lin Wang

    A square-grid triboelectric nanogenerator (SG-TENG) is demonstrated for harvesting vibrational energy and sensing impulsive forces. Each square of the three-dimensional (3D)-printed square grid is filled with an aluminum (Al) ball. The grid structure allows the SG-TENG to harvest vibrational energy over a broad bandwidth and operate at different vibrational angles. The most striking feature of the SG-TENG is its ability of being scaled and integrated. After connecting two SG-TENGs in parallel, the open-circuit voltage and short-circuit current are significantly increased over the full vibrational frequency range. Being integrated with a table tennis racket, the SG-TENG can harvest the vibrational energy from hitting a ping pong ball using the racket, where a direct hit by the racket generates an average output voltage of 10.9 ± 0.6 V and an average output current of 0.09 ± 0.02 μA. Moreover, the SG-TENG integrated into a focus mitt can be used in various combat sports, such as boxing and taekwondo, to monitor the frequency and magnitude of the punches or kicks from boxers and other practitioners. The collected data allow athletes to monitor their status and improve their performance skills. This work demonstrates the enormous potential of the SG-TENG in energy harvesting and sensing applications.

    更新日期:2017-10-04
  • Oxygen-assisted preparation of mechanoluminescent ZnS:Mn for dynamic pressure mapping
    Nano Res. (IF 7.354) Pub Date : 2017-10-02
    Xiandi Wang, Rui Ling, Yufei Zhang, Miaoling Que, Yiyao Peng, Caofeng Pan

    Mechanoluminescent materials that convert mechanical stimuli to light emission have attracted extensive attention for potential applications in human-machine interactions. Here, we report a simple and available novel approach for the oxygen-assisted preparation of ZnS:Mn particles by solid-state reaction at atmospheric pressure without the formation of the corresponding oxides. The existence of O2 has a positive impact on the formation of S vacancies in wurtzite-phase ZnS, leading to the introduction of Mn2+ ion luminescent centers and shallow donor levels, which can improve the electron-hole recombination rate. The O2 ratio and Mn2+ ion doping concentration have significant effects on the luminous efficiency, which is optimal at 1%–20% and 1 at.%–2 at.% respectively. In addition, a device based on the piezo-photonic effect with excellent pressure sensitivity of 0.032 MPa−1 was fabricated, which can map the two-dimensional pressure distribution ranging from 2.2 to 40.6 MPa in situ. This device can be applied to real-time pressure mapping, smart sensor networks, high-level security systems, human-machine interfaces, and artificial skins.

    更新日期:2017-10-02
  • In situ trapped high-density single metal atoms within graphene: Iron-containing hybrids as representatives for efficient oxygen reduction
    Nano Res. (IF 7.354) Pub Date : 2017-10-02
    Daobin Liu, Chuanqiang Wu, Shuangming Chen, Shiqing Ding, Yaofeng Xie, Changda Wang, Tao Wang, Yasir A. Haleem, Zia ur Rehman, Yuan Sang, Qin Liu, Xusheng Zheng, Yu Wang, Binghui Ge, Hangxun Xu, Li Song

    None

    更新日期:2017-10-02
  • Ultrathin nanoporous metal–semiconductor heterojunction photoanodes for visible light hydrogen evolution
    Nano Res. (IF 7.354) Pub Date : 2017-10-02
    Weiqing Zhang, Yunfeng Zhao, Kai He, Jun Luo, Guoliang Li, Ruirui Liu, Siyu Liu, Zhen Cao, Pengtao Jing, Yi Ding

    None

    更新日期:2017-10-02
  • How G-quadruplex topology and loop sequences affect optical properties of DNA-templated silver nanoclusters
    Nano Res. (IF 7.354) Pub Date : 2017-10-02
    Guangyu Tao, Yang Chen, Ruoyun Lin, Jiang Zhou, Xiaojing Pei, Feng Liu, Na Li

    None

    更新日期:2017-10-02
  • 3D mesoporous rose-like nickel-iron selenide microspheres as advanced electrocatalysts for the oxygen evolution reaction
    Nano Res. (IF 7.354) Pub Date : 2017-10-02
    Jiahao Yu, Gongzhen Cheng, Wei Luo

    None

    更新日期:2017-10-02
  • Highly uniform and nonlinear selection device based on trapezoidal band structure for high density nano-crossbar memory array
    Nano Res. (IF 7.354) Pub Date : 2017-05-06
    Qing Luo, Xiaoxin Xu, Hangbing Lv, Tiancheng Gong, Shibing Long, Qi Liu, Ling Li, Ming Liu

    Crossbar array provides a cost-effective approach for achieving high-density integration of two-terminal functional devices. However, the “sneaking current problem”, which can lead to read failure, is a severe challenge in crossbar arrays. To inhibit the sneaking current from unselected cells, the integration of individual selection devices is necessary. In this work, we report a novel TaOx-based selector exhibiting a trapezoidal band structure formed by tuning the concentration of defects in the oxide. Salient features such as a high current density (1 MA·cm–2), high selectivity (5 × 104), low off-state current (~10 pA), robust endurance (>1010), self-compliance, and excellent uniformity were successfully achieved. The integrated one-selector one-resistor (1S1R) device exhibits high nonlinearity in the low resistance state (LRS), which is quite effective in solving the sneaking current issue.

    更新日期:2017-09-09
  • Sulfur-doped graphene nanoribbons with a sequence of distinct band gaps
    Nano Res. (IF 7.354) Pub Date : 2017-07-06
    Yan-Fang Zhang, Yi Zhang, Geng Li, Jianchen Lu, Yande Que, Hui Chen, Reinhard Berger, Xinliang Feng, Klaus Müllen, Xiao Lin, Yu-Yang Zhang, Shixuan Du, Sokrates T. Pantelides, Hong-Jun Gao

    Unlike graphene sheets, graphene nanoribbons (GNRs) can exhibit semiconducting band gap characteristics that can be tuned by controlling impurity doping and the GNR widths and edge structures. However, achieving such control is a major challenge in the fabrication of GNRs. Chevron-type GNRs were recently synthesized via surface-assisted polymerization of pristine or N-substituted oligophenylene monomers. In principle, GNR heterojunctions can be fabricated by mixing two different monomers. In this paper, we report the fabrication and characterization of chevron-type GNRs using sulfur-substituted oligophenylene monomers to produce GNRs and related heterostructures for the first time. First-principles calculations show that the GNR gaps can be tailored by applying different sulfur configurations from cyclodehydrogenated isomers via debromination and intramolecular cyclodehydrogenation. This feature should enable a new approach for the creation of multiple GNR heterojunctions by engineering their sulfur configurations. These predictions have been confirmed via scanning tunneling microscopy and scanning tunneling spectroscopy. For example, we have found that the S-containing GNRs contain segments with distinct band gaps, i.e., a sequence of multiple heterojunctions that results in a sequence of quantum dots. This unusual intraribbon heterojunction sequence may be useful in nanoscale optoelectronic applications that use quantum dots.

    更新日期:2017-09-09
  • Quality assessment of graphene: Continuity, uniformity, and accuracy of mobility measurements
    Nano Res. (IF 7.354) Pub Date : 2017-07-04
    David M. A. Mackenzie, Jonas D. Buron, Patrick R. Whelan, José M. Caridad, Martin Bjergfelt, Birong Luo, Abhay Shivayogimath, Anne L. Smitshuysen, Joachim D. Thomsen, Timothy J. Booth, Lene Gammelgaard, Johanna Zultak, Bjarke S. Jessen, Peter Bøggild, Dirch H. Petersen

    With the increasing availability of large-area graphene, the ability to rapidly and accurately assess the quality of the electrical properties has become critically important. For practical applications, spatial variability in carrier density and carrier mobility must be controlled and minimized. We present a simple framework for assessing the quality and homogeneity of large-area graphene devices. The field effect in both exfoliated graphene devices encapsulated in hexagonal boron nitride and chemical vapor-deposited (CVD) devices was measured in dual current–voltage configurations and used to derive a single, gate-dependent effective shape factor, β, for each device. β is a sensitive indicator of spatial homogeneity that can be obtained from samples of arbitrary shape. All 50 devices investigated in this study show a variation (up to tenfold) in β as a function of the gate bias. Finite element simulations suggest that spatial doping inhomogeneity, rather than mobility inhomogeneity, is the primary cause of the gate dependence of β, and that measurable variations of β can be caused by doping variations as small as 1010 cm−2. Our results suggest that local variations in the position of the Dirac point alter the current flow and thus the effective sample shape as a function of the gate bias. We also found that such variations lead to systematic errors in carrier mobility calculations, which can be revealed by inspecting the corresponding β factor.

    更新日期:2017-09-09
  • An efficientfficient, controllable and facile two-step synthesis strategy: Fe 3 O 4 @RGO composites with various Fe 3 O 4 nanoparticles and their supercapacitance properties
    Nano Res. (IF 7.354) Pub Date : 2017-05-27
    Chao Lian, Zhuo Wang, Rui Lin, Dingsheng Wang, Chen Chen, Yadong Li

    An efficient, controllable, and facile two-step synthetic strategy to prepare graphene-based nanocomposites is proposed. A series of Fe3O4-decorated reduced graphene oxide (Fe3O4@RGO) nanocomposites incorporating Fe3O4 nanocrystals of various sizes were prepared by an ethanothermal method using graphene oxide (GO) and monodisperse Fe3O4 nanocrystals with diameters ranging from 4 to 10 nm. The morphologies and microstructures of the as-prepared composites were characterized by X-ray diffraction, Raman spectroscopy, nitrogen adsorption measurements, and transmission electron microscopy. The results show that GO can be reduced to graphene during the ethanothermal process, and that the Fe3O4 nanocrystals are well dispersed on the graphene sheets generated in the process. The analysis of the electrochemical properties of the Fe3O4@RGO materials shows that nanocomposites prepared with Fe3O4 nanocrystals of different sizes exhibit different electrochemical performances. Among all samples, Fe3O4@RGO prepared with Fe3O4 nanocrystals of 6 nm diameter possessed the highest specific capacitance of 481 F/g at 1 A/g, highlighting the excellent capability of this material. This work illustrates a promising route to develop graphene-based nanocomposite materials with a wide range of potential applications.

    更新日期:2017-09-09
  • Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles
    Nano Res. (IF 7.354) Pub Date : 2017-05-06
    Changhai Wang, Aleksandr A. Levin, Julie Karel, Simone Fabbrici, Jinfeng Qian, Carlos E. ViolBarbosa, Siham Ouardi, Franca Albertini, Walter Schnelle, Jan Rohlicek, Gerhard H. Fecher, Claudia Felser

    Phase transitions and magnetic properties of shape-memory materials can be tailored by tuning the size of the constituent materials, such as nanoparticles. However, owing to the lack of suitable synthetic methods for size-controlled Heusler nanoparticles, there is no report on the size dependence of their properties and functionalities. In this contribution, we present the first chemical synthesis of size-selected Co-Ni-Ga Heusler nanoparticles. We also report the structure and magnetic properties of the biphasic Co-Ni-Ga nanoparticles with sizes in the range of 30–84 nm, prepared by a SBA-15 nanoporous silicatemplated approach. The particle sizes could be readily tuned by controlling the loading and concentration of the precursors. The fractions and crystallite sizes of each phase of the Co-Ni-Ga nanoparticles are closely related to their particle size. Enhanced magnetization and decreased coercivity are observed with increasing particle size. The Curie temperature (Tc) of the Co-Ni-Ga nanoparticles also depends on their size. The 84 nm-sized particles exhibit the highest Tc (≈ 1,174 K) among all known Heusler compounds. The very high Curie temperatures of the Co-Ni-Ga nanoparticles render them promising candidates for application in high-temperature shape memory alloy-based devices.

    更新日期:2017-09-09
  • Anionic liposomes for small interfering ribonucleic acid (siRNA) delivery to primary neuronal cells: Evaluation of alpha-synuclein knockdown efficacy
    Nano Res. (IF 7.354) Pub Date : 2017-05-23
    Michele Schlich, Francesca Longhena, Gaia Faustini, Caitriona M. O’Driscoll, Chiara Sinico, Anna Maria Fadda, Arianna Bellucci, Francesco Lai

    Alpha-synuclein (α-syn) deposition in Lewy bodies (LB) is one of the main neuropathological hallmarks of Parkinson’s disease (PD). LB accumulation is considered a causative factor of PD, which suggests that strategies aimed at reducing α-syn levels could be relevant for its treatment. In the present study, we developed novel nanocarriers suitable for systemic delivery of small interfering ribonucleic acid (siRNA) that were specifically designed to reduce neuronal α-syn by RNA interference. Anionic liposomes loaded with an siRNA–protamine complex for α-syn gene silencing and decorated with a rabies virus glycoprotein (RVG)-derived peptide as a targeting agent were prepared. The nanoparticles were characterized for their ability to load, protect, and deliver the functional siRNA to mouse primary hippocampal and cortical neurons as well as their efficiency to induce gene silencing in these cells. Moreover, the nanocarriers were evaluated for their stability in serum. The RVG-decorated liposomes displayed suitable characteristics for future in vivo applications and successfully induced α-syn gene silencing in primary neurons without altering cell viability. Collectively, our results indicate that RVG-decorated liposomes may be an ideal tool for further studies aimed at achieving efficient in vivo α-syn gene silencing in mouse models of PD.

    更新日期:2017-09-09
  • Hydriding Pd cocatalysts: An approach to giant enhancement on photocatalytic CO 2 reduction into CH 4
    Nano Res. (IF 7.354) Pub Date : 2017-05-27
    Yuzhen Zhu, Chao Gao, Song Bai, Shuangming Chen, Ran Long, Li Song, Zhengquan Li, Yujie Xiong

    Photocatalytic reduction of CO2 into high value-added CH4 is a promising solution for energy and environmental crises. Integrating semiconductors with cocatalysts can improve the activities for photocatalytic CO2 reduction; however, most metal cocatalysts mainly produce CO and H2. Herein, we report a cocatalyst hydridation approach for significantly enhancing the photocatalytic reduction of CO2 into CH4. Hydriding Pd cocatalysts into PdH0.43 played a dual role in performance enhancement. As revealed by our isotopic labeling experiments, the PdH0.43 hydride cocatalysts reduced H2 evolution, which suppressed the H2 production and facilitated the conversion of the CO intermediate into the final product: CH4. Meanwhile, hydridation promoted the electron trapping on the cocatalysts, improving the charge separation. This approach increased the photocatalytic selectivity in CH4 production from 3.2% to 63.6% on Pd{100} and from 15.6% to 73.4% on Pd{111}. The results provide insights into photocatalytic mechanism studies and introduce new opportunities for designing materials towards photocatalytic CO2 conversion.

    更新日期:2017-09-09
  • Trimetallic PtRhNi alloy nanoassemblies as highly active electrocatalyst for ethanol electrooxidation
    Nano Res. (IF 7.354) Pub Date : 2017-05-27
    Huimin Liu, Jiahui Li, Lijuan Wang, Yawen Tang, Bao Yu Xia, Yu Chen

    Although nanostructures based on noble metal alloys are widely utilized in (electro)catalysis, their low-temperature synthesis remains an enormous challenge due to the different Nernst equilibrium potentials of metal precursors. Herein, we describe the successful synthesis of trimetallic PtRhNi alloy nanoassemblies (PtRhNi-ANAs) with tunable Pt/Rh ratios using a simple mixed cyanogel reduction method and provide a detailed characterization of their chemical composition, morphology, and structure. Additionally, the electrochemical properties of PtRhNi-ANAs are examined by cyclic voltammetry, revealing composition-dependent electrocatalytic activity in the ethanol oxidation reaction (EOR). Compared to a commercial Pt black electrocatalyst, optimized Pt3Rh1Ni2-ANAs display remarkably enhanced EOR electrocatalytic performance in alkaline media.

    更新日期:2017-09-09
  • Layer-by-layer assembly of long-afterglow self-supporting thin films with dual-stimuli-responsive phosphorescence and antiforgery applications
    Nano Res. (IF 7.354) Pub Date : 2017-07-04
    Rui Gao, Dongpeng Yan, David G. Evans, Xue Duan

    The assembly of thin films (TFs) having long-lasting luminescence can be expected to play an important role in the development of new-generation smart sensors, anti-counterfeiting materials, and information-encryption systems. However, such films are limited compared with their powder and solution counterparts. In this study, by exploiting the self-organization of phosphors in the two-dimensional (2D) galleries between clay nanosheets, we developed a method for the ordered assembly of long-afterglow TFs by utilizing a hydrogen-bonding layer-by-layer (LBL) process. Compared with the pristine powder, the TFs exhibit high polarization and up-conversion room-temperature phosphorescence (RTP), as well as enhanced quantum yields and luminescence lifetimes, allowing them to be used as room-temperature phosphorescent sensors for humidity and oxygen. Moreover, modified clay-based hybrids with multicolor RTP can serve as anti-counterfeiting marks and triple-mode 2D barcode displays. We anticipate that the LBL assembly process can be extended to the fabrication of other inorganic–organic room-temperature phosphorescent hybrids with smart luminescent sensor and antiforgery applications.

    更新日期:2017-09-09
  • Electrospun poly(vinylidene fluoride-trifluoroethylene)/zinc oxide nanocomposite tissue engineering scaffolds with enhanced cell adhesion and blood vessel formation
    Nano Res. (IF 7.354) Pub Date : 2017-05-06
    Robin Augustine, Pan Dan, Alejandro Sosnik, Nandakumar Kalarikkal, Nguyen Tran, Brice Vincent, Sabu Thomas, Patrick Menu, Didier Rouxel

    Piezoelectric materials that generate electrical signals in response to mechanical strain can be used in tissue engineering to stimulate cell proliferation. Poly (vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)), a piezoelectric polymer, is widely used in biomaterial applications. We hypothesized that incorporation of zinc oxide (ZnO )nanoparticles into the P(VDF-TrFE) matrix could promote adhesion, migration, and proliferation of cells, as well as blood vessel formation (angiogenesis). In this study, we fabricated and comprehensively characterized a novel electrospun P(VDF-TrFE)/ZnO nanocomposite tissue engineering scaffold. We analyzed the morphological features of the polymeric matrix by scanning electron microscopy, and utilized Fourier transform infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry to examine changes in the crystalline phases of the copolymer due to addition of the nanoparticles. We detected no or minimal adverse effects of the biomaterials with regard to blood compatibility in vitro, biocompatibility, and cytotoxicity, indicating that P(VDF-TrFE)/ZnO nanocomposite scaffolds are suitable for tissue engineering applications. Interestingly, human mesenchymal stem cells (hMSCs) and human umbilical vein endothelial cells cultured on the nanocomposite scaffolds exhibited higher cell viability, adhesion, and proliferation compared to cells cultured on tissue culture plates or neat P(VDF-TrFE) scaffolds. Nanocomposite scaffolds implanted into rats with or without hMSCs did not elicit immunological responses, as assessed by macroscopic analysis and histology. Importantly, nanocomposite scaffolds promoted angiogenesis, which was increased in scaffolds pre-seeded with hMSCs. Overall, our results highlight the potential of these novel P(VDF-TrFE)/ZnO nanocomposites for use in tissue engineering, due to their biocompatibility and ability to promote cell adhesion and angiogenesis.

    更新日期:2017-09-09
  • Effect of interface on mid-infrared photothermal response of MoS 2 thin film grown by pulsed laser deposition
    Nano Res. (IF 7.354) Pub Date : 2017-07-04
    Ankur Goswami, Priyesh Dhandaria, Soupitak Pal, Ryan McGee, Faheem Khan, Željka Antić, Ravi Gaikwad, Kovur Prashanthi, Thomas Thundat

    This study reports on the mid-infrared (mid-IR) photothermal response of multilayer MoS2 thin films grown on crystalline (p-type silicon and c-axis-oriented single crystal sapphire) and amorphous (Si/SiO2 and Si/SiN) substrates by pulsed laser deposition (PLD). The photothermal response of the MoS2 films is measured as the changes in the resistance of the MoS2 films when irradiated with a mid-IR (7 to 8.2 μm) source. We show that enhancing the temperature coefficient of resistance (TCR) of the MoS2 thin films is possible by controlling the film-substrate interface through a proper choice of substrate and growth conditions. The thin films grown by PLD are characterized using X-ray diffraction, Raman, atomic force microscopy, X-ray photoelectron microscopy, and transmission electron microscopy. The high-resolution transmission electron microscopy (HRTEM) images show that the MoS2 films grow on sapphire substrates in a layer-by-layer manner with misfit dislocations. The layer growth morphology is disrupted when the films are grown on substrates with a diamond cubic structure (e.g., silicon) because of twin growth formation. The growth morphology on amorphous substrates, such as Si/SiO2 or Si/SiN, is very different. The PLD-grown MoS2 films on silicon show higher TCR (−2.9% K−1 at 296 K), higher mid-IR sensitivity (ΔR/R = 5.2%), and higher responsivity (8.7 V·W–1) compared to both the PLD-grown films on other substrates and the mechanically exfoliated MoS2 flakes transferred to different substrates.

    更新日期:2017-09-09
  • Electrical contacts in monolayer blue phosphorene devices
    Nano Res. (IF 7.354) Pub Date : 2017-09-08
    Jingzhen Li, Xiaotian Sun, Chengyong Xu, Xiuying Zhang, Yuanyuan Pan, Meng Ye, Zhigang Song, Ruge Quhe, Yangyang Wang, Han Zhang, Ying Guo, Jinbo Yang, Feng Pan, Jing Lu

    Semiconducting monolayer (ML) blue phosphorene (BlueP) shares similar stability with ML black phosphorene (BP), and it has recently been grown on an Au surface. Potential ML BlueP devices often require direct contact with metal to enable the injection of carriers. Using ab initio electronic structure calculations and quantum transport simulations, for the first time, we perform a systematic study of the interfacial properties of ML BlueP in contact with metals spanning a wide work function range in a field effect transistor (FET) configuration. ML BlueP has undergone metallization owing to strong interaction with five metals. There is a strong Fermi level pinning (FLP) in the ML BlueP FETs due to the metal-induced gap states (MIGS) with a pinning factor of 0.42. ML BlueP forms n-type Schottky contact with Sc, Ag, and Pt electrodes with electron Schottky barrier heights (SBHs) of 0.22, 0.22, and 0.80 eV, respectively, and p-type Schottky contact with Au and Pd electrodes with hole SBHs of 0.61 and 0.79 eV, respectively. The MIGS are eliminated by inserting graphene between ML BlueP and the metal electrode, accompanied by a transition from a strong FLP to a weak FLP. Our study not only provides insight into the ML BlueP–metal interfaces, but also helps in the design of ML BlueP devices.

    更新日期:2017-09-08
  • One-step synthesis of novel snowflake-like Si-O/Si-C nanostructures on 3D graphene/Cu foam by chemical vapor deposition
    Nano Res. (IF 7.354) Pub Date : 2017-09-08
    Jing Ning, Dong Wang, Jincheng Zhang, Xin Feng, Ruixia Zhong, Jiabo Chen, Jianguo Dong, Lixin Guo, Yue Hao

    The recent development of synthesis processes for three-dimensional (3D) graphene-based structures has tended to focus on continuous improvement of porous nanostructures, doping modification during thin-film fabrication, and mechanisms for building 3D architectures. Here, we synthesized novel snowflake-like Si-O/Si-C nanostructures on 3D graphene/Cu foam by one-step low-pressure chemical vapor deposition (CVD). Through systematic micromorphological characterization, it was determined that the formation mechanism of the nanostructures involved the melting of the Cu foam surface and the subsequent condensation of the resulting vapor, 3D growth of graphene through catalysis in the presence of Cu, and finally, nucleation of the Si-O/Si-C nanostructure in the carbon-rich atmosphere. Thus, by tuning the growth temperature and duration, it should be possible to control the nucleation and evolution of such snowflake-like nanostructures with precision. Electrochemical measurements indicated that the snowflake-like nanostructures showed excellent performance as a material for energy storage. The highest specific capacitance of the Si-O/Si-C nanostructures was ∼963.2 mF/cm2 at a scan rate of 1 mV/s. Further, even after 20,000 sequential cycles, the electrode retained 94.4% of its capacitance.

    更新日期:2017-09-08
  • Exploration of channel width scaling and edge states in transition metal dichalcogenides
    Nano Res. (IF 7.354) Pub Date : 2017-09-08
    Feng Zhang, Chia-Hui Lee, Joshua A. Robinson, Joerg Appenzeller

    We explore the impact of edge states in three types of transition metal dichalcogenides (TMDs), namely metallic Td-phase WTe2 and semiconducting 2H-phase MoTe2 and MoS2, by patterning thin flakes into ribbons with varying channel widths. No obvious charge depletion at the edges is observed for any of these three materials, in contrast to observations made for graphene nanoribbon devices. The semiconducting ribbons are characterized in a three-terminal field-effect transistor (FET) geometry. In addition, two ribbon array designs have been carefully investigated and found to exhibit current levels higher than those observed for conventional one-channel devices. Our results suggest that device structures incorporating a high number of edges can improve the performance of TMD FETs. This improvement is attributed to a higher local electric field, resulting from the edges, increasing the effective number of charge carriers, and the absence of any detrimental edge-related scattering.

    更新日期:2017-09-08
  • Triboelectrification based on double-layered polyaniline nanofibers for self-powered cathodic protection driven by wind
    Nano Res. (IF 7.354) Pub Date : 2017-09-08
    Siwen Cui, Youbin Zheng, Jun Liang, Daoai Wang

    Polyaniline nanofibers (PANI NFs) are introduced to construct a wind-driven triboelectric nanogenerator (TENG) as a new power source for self-powered cathodic protection. PANI NFs serve as a friction layer to generate charges by harvesting wind energy as well as a conducting layer to transfer charges in TENG. A PANI NFs-based TENG exhibits a high output performance with a maximum output voltage of 375 V, short current circuit of 248 μA, and corresponding power of 14.5 mW under a wind speed of 15 m/s. Additionally, a self-powered anticorrosion system is constructed by using a PANI-based TENG as the power source. The immersion experiment and electrochemical measurements demonstrate that carbon steel coupled with the wind-driven TENG is effectively protected with an evident open circuit potential drop and negative shift in the corrosion potential. The smart self-powered device is promising in terms of applications to protect metals from corrosion by utilizing wind energy in ambient conditions.

    更新日期:2017-09-08
  • Application of yolk–shell Fe 3 O 4 @N-doped carbon nanochains as highly effective microwave-absorption material
    Nano Res. (IF 7.354) Pub Date : 2017-09-08
    Mingtao Qiao, Xingfeng Lei, Yong Ma, Lidong Tian, Xiaowei He, Kehe Su, Qiuyu Zhang

    Yolk–shell Fe3O4@N-doped carbon nanochains, intended for application as a novel microwave-absorption material, have been constructed by a three-step method. Magnetic-field-induced distillation-precipitation polymerization was used to synthesize nanochains with a one-dimensional (1D) structure. Then, a polypyrrole shell was uniformly applied to the surface of the nanochains through oxidant-directed vapor-phase polymerization, and finally the pyrolysis process was completed. The obtained products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), and thermogravimetric analyses (TGA) to confirm the compositions. The morphology and microstructure were observed using an optical microscope, scanning electron microscope (SEM), and transmission electron microscope (TEM). The N2 absorption–desorption isotherms indicate a Brunauer–Emmett–Teller (BET) specific surface area of 74 m2/g and a pore width of 5–30 nm. Investigations of the microwave absorption performance indicate that paraffin-based composites loaded with 20 wt.% yolk–shell Fe3O4@N-doped carbon nanochains possess a minimum reflection loss of −63.09 dB (11.91 GHz) and an effective absorption bandwidth of 5.34 GHz at a matching layer thickness of 3.1 mm. In addition, by tailoring the layer thicknesses, the effective absorption frequency bands can be made to cover most of the C, X, and Ku bands. By offering the advantages of stronger absorption, broad absorption bandwidth, low loading, thin layers, and intrinsic light weight, yolk–shell Fe3O4@N-doped carbon nanochains will be excellent candidates for practical application to microwave absorption. An analysis of the microwave absorption mechanism reveals that the excellent microwave absorption performance can be explained by the quarter-wavelength cancellation theory, good impedance matching, intense conductive loss, multiple reflections and scatterings, dielectric loss, magnetic loss, and microwave plasma loss.

    更新日期:2017-09-08
  • Mesoporous TiO 2 microparticles formed by the oriented attachment of nanocrystals: A super-durable anode material for sodium-ion batteries
    Nano Res. (IF 7.354) Pub Date : 2017-09-06
    Liming Ling, Ying Bai, Huali Wang, Qiao Ni, Jiatao Zhang, Feng Wu, Chuan Wu

    Spindle-shaped anatase TiO2 secondary particles were successfully fabricated via the oriented attachment of primary nanocrystals. By adjusting the concentration of tetrabutyl titanate, the size of the TiO2 nanocrystals and particles could be controlled, resulting in pore evolution. Pores for the random aggregation of secondary particles gradually transformed to nanopores originating from the oriented attachment of the primary nanocrystals, resulting in an excellent micro/nanostructure that increased the performance of a sodium-ion battery. The mesoporous TiO2 microparticle anode, with its unique combination of nanocrystals and uniform nanopores, displays super durability (95 mAh/g after 11,000 cycles at 1 C), high initial efficiency (61.4%), and excellent rate performance (265 and 77 mAh/g at 0.1 and 20 C, respectively). In particular, at slow discharge (0.1 C) and fast charge (5, 50, and 100 C) rates, the anatase TiO2 shows remarkable initial charge capacities of 200, 119, and 56 mAh/g, corresponding to 172, 127, and 56 mAh/g, after 150 cycles, respectively, thus meeting the requirements for fast energy storage. This excellent performance can be attributed to the stability of the material and its high ionic conductivity, resulting from the stable architecture with a mesoporous microstructure and without the random aggregation of secondary particles. A fundamental understanding of the pore structure and controllable pore construction has been proven to be effective in increasing the rate capability and durability of nanostructured electrode materials.

    更新日期:2017-09-07
  • Discharge voltage behavior of electric double-layer capacitors during high- g impact and their application to autonomously sensing high- g accelerometers
    Nano Res. (IF 7.354) Pub Date : 2017-09-06
    Keren Dai, Xiaofeng Wang, Fang Yi, Yajiang Yin, Cheng Jiang, Simiao Niu, Qingyu Li, Zheng You

    In this study, the discharge voltage behavior of electric double-layer capacitors (EDLCs) during high-g impact is studied both theoretically and experimentally. A micro-scale dynamic mechanism is proposed to describe the physical basis of the increase in the discharge voltage during a high-g impact. Based on this dynamic mechanism, a multi-field model is established, and the simulation and experimental studies of the discharge voltage increase phenomenon are conducted. From the simulation and experimental data, the relationship between the increased voltage and the high-g acceleration is revealed. An acceleration detection range of up to 10,000g is verified. The design of the device is optimized by studying the influences of the parameters, such as the electrode thickness and discharge current, on the outputs. This work opens up new avenues for the development of autonomous sensor systems based on energy storage devices and is significant for many practical applications such as in collision testing and automobile safety.

    更新日期:2017-09-07
  • Optical emission spectroscopy diagnosis of energetic Ar ions in synthesis of SiC polytypes by DC arc discharge plasma
    Nano Res. (IF 7.354) Pub Date : 2017-09-06
    Jian Gao, Lei Zhou, Jingshuang Liang, Ziming Wang, Yue Wu, Javid Muhammad, Xinglong Dong, Shouzhe Li, Hongtao Yu, Xie Quan

    Silicon carbides are basilic ceramics with proper bandgaps (2.4–3.3 eV) and unique optical properties. SiC@C monocrystal nanocapsules with different morphologies, sizes, and crystal types were synthesized via the fast and facile direct current (DC) arc discharge plasma method. The influence of Ar atmosphere on the formation of nanocrystal SiC polytypes was investigated by optical emission spectroscopy (OES) diagnoses on the arc discharge plasma. Boltzmann’s plot was used to estimate the temperatures of plasma containing different Ar concentrations as 10,582 K (in 2 × 104 Pa of Ar partial pressure) and 14,523 K (in 4 × 104 Pa of Ar partial pressure). It was found that higher energy state of plasma favors the ionization of carbon atoms and promotes the formation of α-SiC, while β-SiC is generally coexistent. Heat-treatment in air was applied to remove the carbon species in as-prepared SiC nanopowders. Thus, the intrinsic characters of SiC polytypes reappeared in the ultraviolet–visible (UV–vis) light absorbance. It was experimentally revealed that the direct bandgap of SiC is 5.72 eV, the indirect bandgap of β-SiC (3C) is 3.13 eV, and the indirect bandgap of α-SiC (6H) is 3.32 eV; visible quantum confinement effect is predicted for these polytypic SiC nanocrystals.

    更新日期:2017-09-07
  • Direct imaging and determination of the crystal structure of six-layered graphdiyne
    Nano Res. (IF 7.354) Pub Date : 2017-09-06
    Chao Li, Xiuli Lu, Yingying Han, Shangfeng Tang, Yi Ding, Ruirui Liu, Haihong Bao, Yuliang Li, Jun Luo, Tongbu Lu

    Since its discovery, the direct imaging and determination of the crystal structure of few-layer graphdiyne has proven difficult because it is too delicate under irradiation by an electron beam. In this work, the crystal structure of a six-layered graphdiyne nanosheet was directly observed by low-voltage transmission electron microscopy (TEM) using low current density. The combined use of high-resolution TEM (HRTEM) simulation, electron energy-loss spectroscopy, and electron diffraction revealed that the as-synthesized nanosheet was crystalline graphdiyne with a thickness of 2.19 nm (corresponding to a thickness of six layers) and showed ABC stacking. Thus, this work provides direct evidence for the existence and crystal structure of few-layer graphdiyne, which is a new type of two-dimensional carbon material complementary to graphene.

    更新日期:2017-09-07
  • 更新日期:2017-09-06
  • Scalable synthesis of sub-100 nm hollow carbon nanospheres for energy storage applications
    Nano Res. (IF 7.354) Pub Date : 2017-09-06
    Hongyu Zhao, Fan Zhang, Shumeng Zhang, Shengnan He, Fei Shen, Xiaogang Han, Yadong Yin, Chuanbo Gao

    None

    更新日期:2017-09-06
  • A novel method for preparing and characterizing graphene nanoplatelets/aluminum nanocomposites
    Nano Res. (IF 7.354) Pub Date : 2017-09-06
    Duosheng Li, Yin Ye, Xiaojun Liao, Qing H. Qin

    None

    更新日期:2017-09-06
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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