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Fabrication of flexible α-MnO_2 nanowire membranes with superior mechanical strength

Chinese Science Bulletin 2014年第13期59卷 1454-1458页

作者： Xingyue Zhao Xiaochong Zhao Jianbao Li Xiangyun Deng Hong Lin State Key Laboratory of New Ceramics & Fine Processing School of Materials Science and Engineering Tsinghua University Science and Technology on Surface Physics and Chemistry Laboratory Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources Hainan University College of Physics and Electronic Information Tianjin Normal University

The Assembly of one-dimensional(1D)nanostructures such as nanowires/nanorods/nanotubes into twodimensional(2D)macrostructured films is attracting considerable research interest because of their unique properties and wide *** this study,flexible membranes were successfully fabricated using a-MnO2nanowires synthesized through a hydrothermal *** effects of thickness and post-annealing temperature on the mechanical properties of the membranes were investigated in ***-indentation measurements showed that the modulus of the as-prepared 11.75 lm-thick membrane reached5.765 GPa,and the modulus increased with the increasing post-annealing ***,the fabricated membranes with superior mechanical strength can have potential applications such as in photocatalysis,filtering,and supporting substrates.

关键词：机械强度二氧化锰纳米线制造膜退火温度机械性能水热法合成

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Mussel‐Directed Synthesis of Nitrogen‐Doped Anatase TiO2

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Angewandte Chemie 2016年第9期128卷

作者： Jingjing Xie Hao Xie Bao‐Lian Su Yi‐bing Cheng Xiaodong Du Hui Zeng Menghu Wang Weimin Wang Hao Wang Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P.R. China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 P.R. China Laboratory of Inorganic Materials Chemistry University of Namur B-5000 Namur Belgium Department of Materials Engineering Monash University Victoria 3800 Australia Department of Pearl Research Guangdong Ocean University Zhanjiang 524025 P.R. China

Structure‐forming processes leading to biominerals are well worth learning in pursuit of new synthetic techniques. Strategies that attempt to mimic nature in vitro cannot replace an entire complex natural organism, requiring ingenuity beyond chemists′ hands. A “bioprocess‐inspired synthesis” is demonstrated for fabrication of N‐doped TiO 2 materials at ambient temperature by direct implantation of precursor into living mussels. The amorphous precursor transforms into N‐doped anatase TiO 2 with a hierarchical nanostructure. Synthetic TiO 2 exhibits high phase stability and enhanced visible‐light photocatalytic activity as a result of modifications to its band gap during in vivo mineralization. Intracellular proteins were found to be involved in TiO 2 mineralization. Our findings may inspire material production by new synthetic techniques, especially under environmentally benign conditions.

关键词： Raumtemperatur Biologisch inspirierte Synthesen Intrazelluläre Proteine Organismen Stickstoffdotiertes TiO2

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Investigation of electron beam detection properties of ZnO nanowire based back-to-back double Schottky diode

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RSC Advances 2014年第25期4卷 12743-12747页

作者： Li, Xin Qi, Junjie Zhang, Qi Wang, Zengze Lu, Shengnan Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China Wuhan 430074 China

The effect of electron beam irradiation on electrical properties of Pt-ZnO NW-Pt double Schottky diodes has been investigated, which were fabricated by a direct-write electron beam lithography method. The reduction of the Schottky barrier height under electron beam irradiation resulted in a current enhancement and these devices show a fast response to the irradiation of 0.1 Hz under either a forward or a reverse bias. As the electron energy increases, the sensitivity reaches a maximum value at around 5 keV and decreases when the electron energy further rises, which is due to the electron-electron interactions as a result of increased electron density. This journal is © the Partner Organisations 2014.

关键词： Electron beams

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In situ transmission electron microscopy investigation on fatigue behavior of single ZnO wires under high-cycle strain

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Nano Letters 2014年第2期14卷 480-485页

作者： Li, Peifeng Liao, Qingliang Yang, Shize Bai, Xuedong Huang, Yunhua Yan, Xiaoqin Zhang, Zheng Liu, Shuo Lin, Pei Kang, Zhuo Zhang, Yue State Key Laboratory for Advanced Metals and Materials Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

The fatigue behavior of ZnO nanowires (NWs) and microwires was systematically investigated with in situ transmission electron microscopy electromechanical resonance method. The elastic modulus and mechanical quality factors of ZnO wires were obtained. No damage or failure was found in the intact ZnO wires after resonance for about 108-109 cycles, while the damaged ZnO NW under electron beam (e-beam) irradiation fractured after resonance for seconds. The research results will provide a useful guide for designing, fabricating, and optimizing electromechanical nanodevices based on ZnO nanomaterials, as well as future applications. © 2014 American Chemical Society.

关键词： Elastic moduli

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Theory of the Dirac half metal and quantum anomalous Hall effect in Mn-intercalated epitaxial graphene

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Physical Review B 2015年第20期92卷 201403(R)-201403(R)页

作者： Yuanchang Li Damien West Huaqing Huang Jia Li S. B. Zhang Wenhui Duan National Center for Nanoscience and Technology Beijing 100190 People's Republic of China Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York 12180 USA Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua University Beijing 100084 People's Republic of China Institute of Advanced Materials Graduate School at Shenzhen Tsinghua University Shenzhen 518055 People's Republic of China Collaborative Innovation Center of Quantum Matter Tsinghua University Beijing 100084 People's Republic of China

The prospect of a Dirac half metal, a material which is characterized by a band structure with a gap in one spin channel but a Dirac cone in the other, is of both fundamental interest and a natural candidate for use in spin-polarized current applications. However, while the possibility of such a material has been reported based on model calculations [H. Ishizuka and Y. Motome, Phys. Rev. Lett. 109, 237207 (2012)], it remains unclear what material system might realize such an exotic state. Using first-principles calculations, we show that the experimentally accessible Mn-intercalated epitaxial graphene on SiC(0001) transits to a Dirac half metal when the coverage is >1/3 monolayer. This transition results from an orbital-selective breaking of quasi-two-dimensional inversion symmetry, leading to symmetry breaking in a single spin channel which is robust against randomness in the distribution of Mn intercalates. Furthermore, the inclusion of spin-orbit interaction naturally drives the system into the quantum anomalous Hall (QAH) state. Our results thus not only demonstrate the practicality of realizing the Dirac half metal beyond a toy model, but also open up an avenue to the realization of the QAH effect.

关键词： HALL effect GRAPHENE ELECTRICITY POLYCYCLIC aromatic hydrocarbons MATHEMATICAL models

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Effect of cationic groups in organic sulfide electrolyte on the performance of CdS quantum dot sensitized solar cells

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Chinese Science Bulletin 2014年第25期59卷 3209-3215页

作者： Xin Li Heping Shen Wenli Wang Jianbao Li Hong Lin State Key Laboratory of New Ceramics & Fine Processing School of Material Science and Engineering TsinghuaUniversity National Engineering Laboratory for Modern Silk (Suzhou) College of Textile and Clothing Engineering of Soochow University Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources College of Materials Science and Chemical Engineering Hainan University

Two organic sulfide redox couples derived from2-mercapto-5-methyl-1,3,4-thiadiazole(McMT):tetrabutylammonium thiolate(McMT-TBA?)/disulfide dimer(BMT)and tetramethylammonium thiolate(McMTTMA?)/BMT were incorporated into quantum dots sensitized solar cells(QDSCs)as alternatives to the inorganic polysulfide electrolyte(Na2S/S).It was found in symmetrical cells test that the interfaces of the organic sulfide electrolytes/platinum counter-electrode have much lower charge transfer resistances as well as higher interface reaction rates compared with that for the inorganic ***,QDSCs based on organic sulfide electrolytes exhibited obviouslyhigher fill factors,open circuit photovoltages,and therefore higher conversion efficiency,thanks to the prohibited recombination and lower redox *** addition,by comparing and analyzing the performance of devices based on organic sulfide electrolytes with different cationic groups,it is found that cationic group TMA?with smaller size was favorable for the mass transport in the electrolyte,which explains the better photovoltaic performance of McMT-TMA?/BMT based solar cell than that of McMT-TBA?/BMT based ***,a power conversion efficiency(PCE)of 0.63%was achieved for QDSCs using McMT-(TMA?)/BMT redox couple as electrolyte,which was till now the highest for CdS QDSC based on organic sulfide electrolyte.

关键词：有机硫化物太阳能电池离子基团电解质量子点敏化影响点硫化镉

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Direct transition resonance in atomically uniform topological Sb(111) thin films

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Physical Review B 2015年第24期92卷 241401(R)-241401(R)页

作者： Guang Bian Caizhi Xu Tay-Rong Chang Xiaoxiong Wang Saavanth Velury Jie Ren Hao Zheng Horng-Tay Jeng T. Miller M. Zahid Hasan T.-C. Chiang Laboratory for Topological Quantum Matter and Spectroscopy (B7) Department of Physics Princeton University Princeton New Jersey 08544 USA Department of Physics University of Illinois at Urbana-Champaign 1110 West Green Street Urbana Illinois 61801-3080 USA Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign 104 South Goodwin Avenue Urbana Illinois 61801-2902 USA Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan College of Science Nanjing University of Science and Technology Nanjing 210094 China Department of Physics University of California Berkeley California 94720 USA State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China Institute of Physics Academia Sinica Taipei 11529 Taiwan

Atomically uniform Sb(111) films are fabricated by the method of molecular beam epitaxy on an optimized Si(111) surface. Two-dimensional quantum well states and topological surface states in these films are well resolved as measured by angle-resolved photoemission spectroscopy. We observe an evolution of direct transition resonances by varying the excitation photon energy (and thus the perpendicular crystal momentum). The experimental results are reproduced in a comprehensive model calculation taking into account first-principles calculated initial states and time-reversed low-energy-electron-diffraction final states in the photoexcitation process. The resonant behavior illustrates that the topological surface states and the quantum well states are analytically connected in momentum space in all three dimensions.

关键词： Geometric & topological phases Surface states Thin films Topological materials Angle-resolved photoemission spectroscopy Molecular beam epitaxy

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Nylon 66 / nomex composite yarn performance analysis

Nylon 66 / nomex composite yarn performance analysis

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作者： Cao, Gen Yang Sheng, Dan Yang, Kai Lu, Xue Feng Xu, Wei Lin Textile Materials and Technology Lab Donghua University Shanghai 201620 China Textile College Wuhan Textile University Wuhan Hubei 430073 China Education Key Laboratory of New Textile Materials Green Processing and Functioning Wuhan Textile University Wuhan Hubei 430073 China

ISBN: (纸本)9783038351382

The embedded composite spinning technology was applied in spinning the composite yarn of polyamide 66 and nomex. The relationship of the polyamide 66 and nomex's content with the mechanical properties of composite yarn and hairiness was discussed. The method of cluster analysis was applied in analyzing the four kinds of yarn's mechanical properties. And the results show that when the confidence interval is 95%, the significance of two kinds yarns were greater than 0.05. There is no significant difference between the programs. While the analysis of the hairiness data showed that the fourth solution's harmful hairiness was much lower that the first solution's. Therefore, the best solution is the fourth solution. © (2014) Trans Tech Publications, Switzerland.

关键词： Yarn

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Concerted Rattling in CsAg5Te3Leading to Ultralow Thermal Conductivity and High Thermoelectric Performance

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Angewandte Chemie 2016年第38期128卷

作者： Hua Lin Gangjian Tan Jin‐Ni Shen Shiqiang Hao Li‐Ming Wu Nicholas Calta Christos Malliakas Si Wang Ctirad Uher Christopher Wolverton Mercouri G. Kanatzidis Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 P.R. China Department of Chemistry Northwestern University Evanston IL 60208 USA Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Physics University of Michigan Ann Arbor MI 48109 USA

Thermoelectric (TE) materials convert heat energy directly into electricity, and introducing new materials with high conversion efficiency is a great challenge because of the rare combination of interdependent electrical and thermal transport properties required to be present in a single material. The TE efficiency is defined by the figure of merit ZT =( S 2 σ ) T / κ , where S is the Seebeck coefficient, σ is the electrical conductivity, κ is the total thermal conductivity, and T is the absolute temperature. A new p‐type thermoelectric material, CsAg 5 Te 3 , is presented that exhibits ultralow lattice thermal conductivity (ca. 0.18 Wm −1 K −1 ) and a high figure of merit of about 1.5 at 727 K. The lattice thermal conductivity is the lowest among state‐of‐the‐art thermoelectrics; it is attributed to a previously unrecognized phonon scattering mechanism that involves the concerted rattling of a group of Ag ions that strongly raises the Grüneisen parameters of the material.

关键词： CsAg5Te3 Konzertiertes Rasseln Thermoelektrika Tunnelstrukturen Wärmeleitfähigkeit

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Interconnected graphene/polymer micro-tube piping composites for liquid sensing

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Nano Research 2014年第6期7卷 869-876页

作者： Tingting Yang Hongze Zhang Yan Wang Xiao Li Kunlin Wang Jinquan Wei Dehai Wu Zhihong Li Hongwei Zhu School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Materials Processing Technology of MOE Tsinghua University 8eijing 100084 China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Institute of Microelectronics Peking University Beijing 100871 China Department of Physics and Nanoscience and Nanotechnology Laboratory Institute for Advanced Study Nanchang University Nanchang 330031 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

Detection and analysis of volatile organic compounds （VOCs） as pollutants in the atmosphere and liquids are of great significance because of the detrimental effects of VOCs. A polymer-coated graphene micro-tube piping （GMP） structure with a cross-linked and interconnected channel network was synthesized for liquid sensing. By virtue of their unique cross-linked and interconnected channel network configuration, polycrystalline conformation, and the support of a polymer layer, the resistivity of the 3D hollow micro-tubing GMPs was sensitive to strain, ensuring high sensitivity of the liquid sensor （R/Ro of -4 × 10^3% for pure acetone and R/Ro of -105% for 0.01 wt.% acetone solution）. Due to the capillary force, the interfaces of the 3D structures can speed up the penetration of solvents into the polymer, thus promote distinct selectivity within seconds and significantly decrease the response time. Owing to their good selectivity, high sensitivity, rapid response and flexibility, and the ease of use of the sensors and the simplicity of the fabrication processes, the GMP/polymer composites should be a good candidate for liquid sensing.

关键词： liquid sensing graphene micro-tube piping flexible devices high sensitivity

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