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A Cu/ZnO Nanowire/Cu Resistive Switching Device

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Nano-Micro Letters 2013年第3期5卷 159-162页

作者： Lijie Li Yan Zhang Zhengjun Chew Multidisciplinary Nanotechnology Centre College of Engineering Swansea University Wuhan University of Technology institute of Theoretical Physics Lanzhou University beijing institute of nanoengergy and nanosystem Chinese Academy of Science

A new device has been realized using flip-chip joining two printed circuit boards(PCBs) on which zinc oxide(ZnO) nanowires were synthesized. Energy dispersive X-ray measurement has been conducted for the ZnO nanowires, confirming that Cu elements have been diffused into the nanowires during the chemical growth process. From I-V measurements, this Cu/ZnO nanowire/Cu structure exhibits a resistive tuning behaviour, which varies greatly with the frequency of the applied sinusoidal source.

关键词： Cu/ZnO Nanowires Flip-chip Resistive switching Device

Influence of the replacement of alkoxyl with alkylthienyl on photovoltaic properties of two small molecule donors for organic solar cells

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Science China Chemistry 2017年第10期60卷 1340-1348页

作者： Shaoqing Zhang Liyan Yang Delong Liu Chang He Jianqi Zhang Yun Zhang Jianhui Hou School of Chemistry and Biology Engineering University of Science and Technology Beijing Beijing 100083 China State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Key Laboratory of nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology Beijing 100190 China

Two benzo[1,2-b:4,5-b￠]dithiophene(BDT)-based small molecule(SM) donor materials with identical conjugated backbones but different substitution groups, named as DRTB-O and DRTB-T, were well explored to demonstrate the influence of the replacement of alkoxy with alkylthienyl on their photovoltaic properties in fullerene-based and fullerene-free organic solar cells(OSCs). The study shows that the two SM donors possess similar absorption spectra and energy levels but different crystalline structures in solid films. The carrier transport property and phase separation morphologies of the blend films have also been fully *** employing PC71 BM as the acceptor, the power conversion efficiency(PCE) of DRTB-O:PC71BM and DRTB-T:PC71BM based devices were 4.91% and 7.08%, respectively. However, by blending with IDIC, the two SM donors exhibited distinctly different photovoltaic properties in fullerene-free OSCs, and the PCE of DRTB-O:IDIC and DRTB-T:IDIC based devices were 0.15% and9.06%, respectively. These results indicate that the replacement of alkoxyl with alkylthienyl in designing SM donor materials plays an important role in the application of fullerene-free OSCs.

关键词： organic solar cells small molecule fullerene-free side chain molecular design

Effect of defects on the electronic structure of a PbI2/MoS2 van der Waals heterostructure: A first-principles study

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Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 64-69页

作者： Wen He HuaWei Li HuiQiong Zhou HongKang Zhao Hui Wang XingHua Shi School of Physics Beijing Institute of TechnologyBeijing 100081China Laboratory of Theoretical and Computational Nanoscience CAS Key Laboratory for Nanosystem and Hierarchy FabricationCAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

PbI2/MoS2,as a typical van der Waals(vdW)heterostructure,has attracted intensive attention owing to its remarkable electronic and optoelectronic *** this work,the effect of defects on the electronic structures of a PbI2/MoS2 heterointerface has been systematically *** manner in which the defects modulate the band structure of PbI2/MoS2,including the band gap,band edge,band alignment,and defect energy-level density within the band gap is discussed *** is shown that sulfur defects tune the band gaps,iodine defects shift the positions of the band edge and Fermi level,and lead defects realize the conversions between the straddling-gap band alignment and valence-band-aligned gap,thus enhancing the light-absorption ability of the material.

关键词： defect engineering electronic structures PbI2/MoS2 van der Waals heterostructure first-principles study

Molecular dynamics simulation of diffusion of nanoparticles in mucus

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Acta Mechanica Solida Sinica 2017年第3期30卷 241-247页

作者： Jiuling Wang Xinghua Shi LNM Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China CAS Key Laboratory for nanosystem and Hierarchy Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

The rapid diffusion of nanoparticles （NPs） through mucus layer is critical for efficient transportation of NPs-loaded drug delivery system. To understand how the physical and surface properties of NPs affect their diffusion in mucus, we have developed a coarse-grained molecular dynamics model to study the diffusion of NPs in modeled mucus layer. Both steric obstruction and hydrodynamic interaction are included in the model capable of capturing the key characteristics of NPs＇ diffusion in mucus. The results show that both particle size and surface properties significantly affect the diffusivities of NPs in mucus. Furthermore, we find rodlike NPs can gain a higher diffusivity than spherical NPs with the same hydrodynamic diameter. In addition, the disturbed environment can enhance the diffusivity of NPs. Our findings can be utilized to design mucus penetrating NPs for targeted drug delivery system.

关键词： Nanoparticle diffusion Mucus penetration Fibrous medium Molecular dynamics simulation Drug delivery

Pyrolyzed bacterial cellulose/graphene oxide sandwich interlayer for lithium–sulfur batteries

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Rare Metals 2017年第5期36卷 418-424页

作者： Yu-Di Shen Zhi-Chang Xiao Li-Xiao Miao De-Bin Kong Xiao-Yu Zheng Yan-Hong Chang Lin-Jie Zhi Chinese Academy of Sciences Key Laboratory of nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology Beijing 100190China Department of Environmental Engineering University of Science and Technology of BeijingBeijing 100083China beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants University of Science and Technology of BeijingBeijing 100083China institute of Forensic Science Ministry of Public SecurityBeijing 100038China

Herein, a facile strategy for the synthesis of sandwich pyrolyzed bacterial cellulose（PBC）/graphene oxide（GO） composite was reported simply by utilizing the large-scale regenerated biomass bacterial cellulose as precursor. The unique and delicate structure where three-dimensional interconnected bacterial cellulose（BC） network embedded in two-dimensional GO skeleton could not only work as an effective barrier to retard polysulfide diffusion during the charge/discharge process to enhance the cyclic stability of the Li–S battery, but also offer a continuous electron transport pathway for the improved rate *** a result, by utilizing pure sulfur as cathodes, the Li–S batteries assembled with PBC/GO interlayer can still exhibit a capacity of nearly 600 mAh·g^-1 at 3C and only 0.055% capacity decay per cycle can be observed over 200 cycles. Additionally, the cost-efficient and environmentfriendly raw materials may enable the PBC/GO sandwich interlayer to be an advanced configuration for Li–S batteries.

关键词： Biomass materials Graphene oxide Separator Lithium–sulfur batteries

Ferromagnetism in sp^(2) carbon

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Nano Research 2023年第12期16卷 12883-12900页

作者： Wenxiang Wang Julienne Impundu Jiyou Jin Zhisheng Peng Hui Liu Zheng Wei Yushi Xu Yu Wang Jiawang You Weimin Fan Yong Jun Li Lianfeng Sun CAS Key Laboratory of nanosystem and Hierarchical Fabrication Nanofabrication laboratoryCAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China The GBA National institute for Nanotechnology Innovation Guangzhou 510700China

The bulk,pristine sp^(2) carbons,such as graphite,carbon nanotubes,and graphene,are usually assumed to be typical diamagnetic ***,over the past two decades,there have been many reports about the ferromagnetism in these sp^(2) carbon materials,which have attracted intense interest for basic research and potential *** this review,we focus on the evidence and developments of the emergent ferromagnetism in sp^(2) carbon revealed by nine kinds of experimental methods:magnetic force microscopy(MFM),magnetization measurements with physical property measurement system(PPMS),X-ray magnetic circular dichroism(XMCD),scanning tunneling microscopy(STM),miniaturized magnetic particle inspection(MPI),anomalous Hall effect(AHE),mechanical deflection of carbon nanotube cantilevers,magnetoresistance,and spin-related devices(spin field effect transistor and spin memory).The advantages,conclusions,challenges,and future of these methods are *** ferromagnetism in sp^(2) carbon will open a door to explore exotic physical phenomena and lay the basis for the development of integrated circuit of spintronics,which is fundamentally different from charge-based conventional electronics.

关键词： ferromagnetism sp^(2)carbon anomalous Hall effect spin devices magnetoresistance

Facile synthesis of ultrathin metal-organic framework nanosheets for Lewis acid catalysis

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Nano Research 2019年第2期12卷 437-440页

作者： Xiaofei Zhang Lin Chang Zhongjie Yang Yanan Shi Chang Long Jianyu Han Binhao Zhang Xueying Qiu Guodong Li Zhiyong Tang School of Materials Science and Engineering Harbin Institute of Technology Harbin 150080 China CAS Key Laboratory of nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China

Ultrathin metalorganic framework (MOF) nanosheets are attracting great interest in catalysis due to their unique and intriguing two-dime nsional (2D) features. Although many progresses have been achieved, it is still highly desirable to develop novel strategies for controllable synthesis of the well-defined ultrathin MOF nanosheets. Herein we report a polyvinylpyrrolidone (PVP)-assisted route to synthesize the ultrathin Ni-MOF nanosheets characteristic of 1.5 nm in thickness, in which PVP is reacted with 2-aminoterephthalic acid (H2BDC-NH2) via formation of C=N bon d, followed by coord inatio n with Ni2+ io ns to form the ultrathi n MOF n anosheets. Impressively, when used in the Kno eve nagel condensation reactions of propane dinitrile with different aldehydes, ultrathin Ni-MOF nanosheets display the significantly enhanced catalytic activity and good stability in respect with the bulk Ni-MOF, mainly owing to the exposed active sites as well as facile mass transfer and diffusion of substrates and products.

关键词： ultrathin nanosheet metal-organic framework Lewis acid site Knoevenagel condensation

Mace-like TTF-TCNQ/HKUST-1 composite structures for rapid NO_(2) detection: Synergistically induced ultrahigh sensitivity and outstanding selectivity

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Nano Research 2023年第12期16卷 13366-13374页

作者： Chaoxin Lin Kumchol Kim Zuochao Wang Zhuang Yan Zhiyong Tang Yaling Liu CAS Key Laboratory of nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Dalian institute of Chemical Physics Chinese Academy of SciencesDalian 116023China

Integration and synergy of the unique functions of different components have been developed into one of the most convenient and effective ways to construct the composite advanced materials with collective properties and improved *** this work,the mace-like tetrathiafulvalene-tetracyanoquinodimethane(TTF-TCNQ)/HKUST-1 composite structures with single single-crystalline TTF-TCNQ submicrorods covered by ordered HKUST-1 nanosheet arrays were successfully constructed by an efficient TTF-TCNQ seed-mediated growth ***,thanks to the synergetic and complementary effects between TTF-TCNQ and HKUST-1,the sensors based on such mace-like TTF-TCNQ/HKUST-1 composite structures not only displayed an experimental detection limit of 10 part per billion(ppb)for NO_(2) detection,but also exhibited outstanding selectivity even if the concentration of the interfering gases was 10 times that of NO_(2).Meanwhile,good reproducibility and rapid response were also *** work opens the avenue for creation of novel high-performance sensing materials for application in gas sensing.

关键词： tetrathiafulvalene-tetracyanoquinodimethane(TTF-TCNQ)/HKUST-1 integration and synergy NO_(2)detection excellent sensing performance

Dual-functional conductive nanofilm absorber

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Nano Research 2023年第12期16卷 13375-13380页

作者： Hongyan Liu Zheng Xie Weiming Liu Hongdong Li Yue Yan Xiaoli Wang beijing institute of Aeronautical Materials Beijing 100095China College of Rare Earth and Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China CAS Key Laboratory of nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Converting solar energy by to other forms of energy has attracted a lot of interest from academy to ***,the overall utilization efficiency of solar energy is inferior due to the limited effective solar spectrum ***,in order to utilize the broadband solar spectrum more efficiently,a novel hybrid absorber structure was proposed,which consists of a four-layer planar nanofilm with dual functions of heat absorption and *** average absorption in the visible range is larger than 0.95,and in the near-infrared spectral region,the average absorption is still larger than *** overall absorption of the absorber is over 0.86,while the thermal emittance is lower than 0.04,which can lead to remarkable thermal utilization ***,the full range of the solar irradiance can be utilized by incorporating the photocatalytic TiO_(2) layer into the absorber,which is active in the ultraviolet spectral *** addition to the broadband spectral usage,the virtues of inexpensiveness and environmental friendliness make it a facile alternative to be applied in solar energy transformation.

关键词： absorber photocatalysis multilayer film heat