检索结果-内蒙古大学图书馆

作者： Xu, Hongyan Shen, Yaochun Hu, Yihua Li, Jianqiang Xu, Ju Beijing Engineering Laboratory of Electrical Drive System & Power Electronic Device Packaging Technology Micro-nano fabrication technology department Institute of Electronic Engineering Chinese Academy of Sciences Beijing 100190 China School of Electrical Engineering Electronics andComputer Science University of Liverpool LiverpoolL69 3GJ United Kingdom State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China

A highly reliable three-dimensional networkstructure jointwas fabricatedbased on Cu@Ni@Sn core-shell powderand transient liquid phase bonding (TLPB) technologyfor high temperature application. Cu@Ni@Sn joint is characterized by Cu metal particles embedded in the matrix of (Cu,Ni)6Sn5/Ni3Sn4intermetallics (IMCs), low level of voiding is achieved, they can be reflowed at a low temperatures( © 2019 IMAPS-International microelectronics and Packaging Society. All rights reserved.

关键词： High temperature applications

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Fabrication of highly reliable joint based on Cu/Ni/Sn double-layer powder for high temperature application

Fabrication of highly reliable joint based on Cu/Ni/Sn doubl...

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作者： Xu, Hongyan Shen, Yaochun Hu, Yihua Li, Jianqiang Xu, Ju Beijing Engineering Laboratory of Electrical Drive System and Power Electronic Device Packaging Technology Micro-Nano Fabrication Technology Department Institute of Electronic Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China School of Electrical Engineering Electronics and Computer Science University of Liverpool Brownlow Hill LiverpoolL69 3GJ United Kingdom State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

A highly reliable three-dimensional network structure joint was fabricated based on Cu/Ni/Sn powder with double-layer coatings and transient liquid phase bonding (TLPB) technology for high temperature application. The Cu/Ni/Sn joint is characterized by Cu metal particles embedded in the matrix of (Cu,Ni)6Sn5/Ni3Sn4 intermetallic compounds (IMCs), with a low void ratio, and can be reflowed at low temperatures (6Sn5/ Ni3Sn4 IMCs, and the Cu/Ni/Sn joint had a lower void ratio and a higher shear strength than those of Cu/Sn. The mechanism of the Ni-coating layer inhibiting phase transformation was studied. The high reliable three-dimensional network structure joint based on Cu/Ni/Sn double-layer powder was fabricated for high temperature application. Copyright © International microelectronics Assembly and Packaging Society

关键词： High temperature applications

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Phyllotaxis-inspired nanosieves with multiplexed orbital angular momentum

arXiv

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arXiv 2021年

作者： Jin, Zhongwei Janoschka, David Deng, Junhong Ge, Lin Dreher, Pascal Frank, Bettina Hu, Guangwei Ni, Jincheng Yang, Yuanjie Li, Jing Yu, Changyuan Lei, Dangyuan Li, Guixin Xiao, Shumin Mei, Shengtao Giessen, Harald zu Heringdorf, Frank Meyer Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore117583 Singapore College of Optical and Electronic Technology China Jiliang University Hangzhou310018 China University of Duisburg–Essen Lotharstrasse 1-21 Duisburg47057 Germany Department of Materials Science and Engineering Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Beijing Qianjunyide Technology Co. Ltd. Beijing100031 China University of Stuttgart StuttgartD-70569 Germany School of Physics University of Electronic Science and Technology of China Chengdu611731 China Key Laboratory of Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Department of Electronic and Information Engineering Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Hong Kong Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong Hong Kong State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Shenzhen Graduate School Harbin Institute of Technology Shenzhen518055 China

nanophotonic platforms such as metasurfaces, achieving arbitrary phase profiles within ultrathin thickness, emerge as miniaturized, ultracompact and kaleidoscopic optical vortex generators. However, it is often required to segment or interleave independent sub-array metasurfaces to multiplex optical vortices in a single nano-device, which in turn affects the device’s compactness and channel capacity. Here, inspired by phyllotaxis patterns in pine cones and sunflowers, we theoretically prove and experimentally report that multiple optical vortices can be produced in a single compact phyllotaxis nanosieve, both in free space and on a chip, where one meta-atom may contribute to many vortices simultaneously. The time-resolved dynamics of on-chip interference wavefronts between multiple plasmonic vortices was revealed by ultrafast time-resolved photoemission electron microscopy. Our nature-inspired optical vortex generator would facilitate various vortex-related optical applications, including structured wavefront shaping, free-space and plasmonic vortices, and high-capacity information metaphotonics. Copyright © 2021, The Authors. All rights reserved.

关键词： Plasmonics

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Highly enhanced visible-light photocatalytic NOx purification and conversion pathway on self-structurally modified g-C-3N4 nanosheets

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science Bulletin 2018年第10期63卷 609-620页

作者： Yuhan Li Yanjuan Sun Wingkei Ho Yuxin Zhang Hongwei Huang Qiang Cai Fan Dong Chongqing Key Laboratory of Catalysis and New Environmental Materials Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of Education College of Environment and Resources Chongqing Technology and Business University Chongqing 400067. China Department of Science and Environmental Studies. The Center for Education in Environmental Sustainability The Education University of Hong Kong. Hong Kong China College of Materials Science and Engineering National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology. Chongqing University.Chongqing 400044. China School of Materials Science and Technology National Laboratory of Mineral Materials China University of Geosciences Beijing 100083 China

The unmodified graphitic carbon nitride(g-C_3N_4) suffers from low photocatalytic activity because of the unfavourable *** the present work,we reported a simple self-structural modification strategy to optimize the microstructure of g-C_3N_4 and obtained graphene-like g-C_3N_4 nanosheets with porous *** contrast to traditional thermal pyrolysis preparation of g-C_3N_4,the present thermal condensation was improved via pyrolysis of thiourea in an alumina crucible without a cover,followed by secondary heat *** popcorn-like formation and layer-by-layer thermal exfoliation of graphene-like porous g-C_3N_4 was proposed to explain the formation *** photocatalytic removal performance of both NO and NO_2 with the graphene-like porous g-C_3N_4 for was significantly enhanced by selfstructural *** experiments and in-situ diffuse reflectance infrared fourier transform spectroscopy(DRIFTS) measurement were conducted to detect the active species during photocatalysis and the conversion pathway of g-C_3N_4 photocatalysis for NO_x purification was *** photocatalytic activity of graphene-like porous g-C_3N_4 was highly enhanced due to the improved charge separation and increased oxidation capacity of the ·O_2^- radicals and *** work could not only provide a novel self-structural modification for design of highly efficient photocatalysts,but also offer new insights into the mechanistic understanding of g-C_3N_4 photocatalysis.

关键词： Self-structural modification g-C3N4 Visible light photocatalysis In-situ DRIFTS Conversion pathway

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Real-time imaging of accelerated solid-liquid-gas reactions with nanobubbles

Research Square

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Research Square 2020年

作者： Wang, Wen Xu, Tao Chen, Jige Shangguan, Junyi Dong, Hui Ma, Huishu Zhang, Qiubo Bai, Tingting Guo, Zhirui Fang, Haiping Zheng, Haimei Sun, Litao SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of Education Collaborative Innovation Center for Micro/Nano Fabrication Device and System Southeast University Nanjing210096 China Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Shanghai Synchrotron Radiation Facility Zhangjiang Laboratory Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201204 China Department of Physics East China University of Science and Technology Shanghai200237 China Department of Materials Science and Engineering University of California BerkeleyCA94720 United States Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China Key Laboratory of Welding Robot and Application Technology of Hunan Province Engineering Research Center of Complex Tracks Processing Technology Equipment of Ministry of Education Xiangtan University Xiangtan411105 China The Second Affiliated Hospital Key Laboratory for Aging & Disease Nanjing Medical University Nanjing210011 China

Solid-liquid-gas reactions are ubiquitous. An understanding of how gases influence the reactions at the nanoscale is significant for achieving the enhanced triple-phase reactions. Here, we report a real-time observation of the accelerated etching of gold nanorods with oxygen nanobubbles in aqueous hydrobromic acid using liquid cell transmission electron microscopy (TEM). Our observation reveals that when an oxygen nanobubble is close to a nanorod below the critical distance (~1nm), the local etching rate is significantly enhanced with over an order of magnitude faster. Molecular dynamics simulations results show that the strong attractive van der Waals interaction between the gold nanorod and oxygen molecules facilitates the transport of oxygen through the thin liquid layer to the gold surface and thus plays a crucial role in increasing the etching rate. This result sheds light on the rational design of solid-liquid-gas reactions for enhanced activities. © 2020, CC BY.

关键词： Molecular dynamics

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Gd 3 Ga 5 O 12 : a wide bandgap semiconductor electrolyte for ceramic fuel cells, effective at temperatures below 500 °C

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Journal of Rare Earths 2024年

作者： Junjiao Li Muhammad Yousaf Jahangeer Ahmed Bushra Bibi Asma Noor Norah Alhokbany Muhammad Sajid Atif Nazar M.A.K. Yousaf Shah Xiaofeng Guo Xiangqin Ding Naveed Mushtaq Yuzheng Lu Department of Electronic and Engineering Nanjing Vocational Institute of Mechatronic Technology Nanjing 211306 China College of Chemistry and Environmental Engineering Shenzhen University Shenzhen 518060 China Department of Chemistry College of Science King Saud University P.O. Box 2455 Riyadh 11451 Saudi Arabia Energy Storage Joint Research Center School of Energy and Environment Southeast University Nanjing 210096 China Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China Institute of Microscale Optoelectronics Optical Engineering Shenzhen University Shenzhen 518060 China School of Physics Electronics and Intelligent Manufacturing Huaihua University Huaihua 418000 China Jiangsu Key Laboratory of Zero-Carbon Energy Development and System Integration Nanjing Xiaozhuang University Nanjing 211171 China

Searching for compatible electrolytes with Ni 0.8 Co 0.15 Al 0.05 LiO 2 (NCAL) electrodes with high ionic conductivity at low operational temperatures (<550 °C) is essential for the research on ceramics fuel cells (CFCs). In this work, the experimental and theoretical analyses demonstrate that the highly stable single-phase Gd 3 Ga 5 O 12 (GGO) garnet structure, composed of Gd-O octahedrons and Ga-O tetrahedrons, provides more active sites for ion transport, resulting in enhanced peak power density (PPD) and stable open circuit voltage (OCV) at low operational temperature. The unique internal garnet structure effectively reduces the interfacial impedance of the prepared fuel cell device, provides many active sites at triple-phase boundaries and increases the electrochemical stability. As a result, the constructed cell can deliver a superior peak power density of 770 mW/cm 2 at 490 °C. In addition, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy and theoretical calculations further demonstrate electrolyte effectiveness of GGO, enabling stable OCV even at a low temperature of 370 °C under a H 2 /air environment. This work can help in improving the understanding of the underlying mechanisms of a single-layer fuel cell device, which is essential to further develop this potential energy technology even at a very low temperature of 370 °C.

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Fine-Tuning Crystal Structures of Lead Bromide Perovskite nanocrystals through Trace Cadmium(II) Doping for Efficient Color-Saturated Green LEDs

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Angewandte Chemie 2024年第26期136卷

作者： Dr. Jianfeng Zhang Dr. Junhui Wang Dr. Lei Cai Dr. Sheng Wang Prof. Kaifeng Wu Prof. Baoquan Sun Prof. Weitao Zheng Dr. Stephen V. Kershaw Prof. Guohua Jia Prof. Xiaoyu Zhang Prof. Andrey L. Rogach Prof. Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University Shanghai 200072 P. R. China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 P. R. China State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning P. R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou 215123 P. R. China Key Laboratory of Automobile Materials Ministry of Education College of Materials Science and Engineering Jilin University Changchun 130012 P. R. China Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR 999077 P. R. China School of Molecular and Life Science Curtin University Bentley WA 6102 Australia

Decreasing perovskite nanocrystal size increases radiative recombination due to the quantum confinement effect, but also increases the Auger recombination rate which leads to carrier imbalance in the emitting layers of electroluminescent devices. Here, we overcome this trade-off by increasing the exciton effective mass without affecting the size, which is realized through the trace Cd 2+ doping of formamidinium lead bromide perovskite nanocrystals. We observe an ~2.7 times increase in the exciton binding energy benefiting from a slight distortion of the [BX 6 ] 4− octahedra caused by doping in the case of that the Auger recombination rate is almost unchanged. As a result, bright color-saturated green emitting perovskite nanocrystals with a photoluminescence quantum yield of 96 % are obtained. Cd 2+ doping also shifts up the energy levels of the nanocrystals, relative to the Fermi level so that heavily n -doped emitters convert into only slightly n -doped ones; this boosts the charge injection efficiency of the corresponding light-emitting diodes. The light-emitting devices based on those nanocrystals reached a high external quantum efficiency of 29.4 % corresponding to a current efficiency of 123 cd A −1 , and showed dramatically improved device lifetime, with a narrow bandwidth of 22 nm and Commission Internationale de I'Eclairage coordinates of (0.20, 0.76) for color-saturated green emission for the electroluminescence peak centered at 534 nm, thus being fully compliant with the latest standard for wide color gamut displays.

关键词： perovskite nanocrystals light-emitting diode exciton binding energy auger recombination cadmium (II) doping

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Mass-manufactural Lanthanide-based Ultraviolet C microlasers

Mass-manufactural Lanthanide-based Ultraviolet C Microlasers

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第九届国际稀土开发与应用研讨会暨2019中国稀土学会学术年会

作者： Limin Jin Yunkai Wu Yujie Wang Yuqi Zhang Zhiying Li Xian Chen Wenfei Zhang Shumin Xiao Qinghai Song State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemShenzhen Graduate SchoolHarbin Institute of Technology College of Materials Science of Engineering Shenzhen University Shenzhen Key Laboratory of Laser Engineering College of Optoelectronic EngineeringShenzhen University Collaborative Innovation Center of Extreme Optics Shanxi University

Lanthanide(Ln)-based ultraviolet C（UVC） microlasers are highly desirable for diagnostics and phototherapy. Despite of their progresses, the potential applications of UVC microlasers are strongly hindered by their low optical gain, weak light confinements, and poor device repeatability. Herein, we report a novel approach to all-in-one solve the above limitations and realize mass-manufactural UVC microlasers. The gain coefficient at 289 nm has been improved from two aspects, i.e. the enhanced absorption via LiYbF:Tm（lmoI%）@LiYbF@LiLuF core-shell-shell nanocrystals and the suppression of competitive ultraviolet ***, by spin-coating the solution onto patterned SiO substrate, high-quality Ln-based microdisks are self-assembly formed on each SiO pillar and UVC whispering-gallery-mode lasers have been realized. The resulted lasing threshold is an order of magnitude smaller than the shortest deep-ultraviolet emission at 310 nm. Importantly,the lasing wavelengths and mode numbers of UVC lasers are highly controllable and repeatable, making them suitable for mass-production for the first time.

关键词： lanthanide-doped upconversion nanocrystals on-chip microlaser array ultraviolet C lasing emission high controllability whispering gallery modes

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Gain-Assisted Plasmon Resonance Narrowing and Its Application in Sensing

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Physical Review Applied 2019年第4期11卷 044030-044030页

作者： Lijun Meng Ding Zhao Yuanqing Yang F. Javier García de Abajo Qiang Li Zhichao Ruan Min Qiu Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics and State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou Zhejiang China ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology 08860 Castelldefels (Barcelona) Spain State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 China DTU Nanolab Technical University of Denmark 2800 Kongens Lyngby Denmark SDU Nano Optics University of Southern Denmark Campusvej 55 DK-5230 Odense Denmark ICREA-Institució Catalana de Recerca i Estudis Avançats Passeig Lluís Companys 23 08010 Barcelona Spain Institute of Advanced Technology Westlake Institute for Advanced Study 18 Shilongshan Road Hangzhou 310024 Zhejiang Province China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University 18 Shilongshan Road Hangzhou 310024 Zhejiang Province China

We demonstrate the viability of using high-order modes in localized optical resonances combined with gain media to dramatically reduce the linewidths of absorption spectra. Our theoretical study provides a rational design route for small-footprint absorption with a high quality factor, which is typically a trade-off for plasmonic light absorbers. Specifically, we design and numerically investigate a metal-insulator-metal absorber and a graphene Salisbury screen. Additionally, we study the potential application of these structures in sensing in order to achieve higher performance compared with conventional sensors based on the fundamental mode. Our approach, which can readily operate in a multiplexed fashion, has the potential for sensing minute amounts of analytes with a high figure of merit.

关键词： Analytical chemistry Integrated optics Light propagation, transmission & absorption Metamaterials nanoantennas Plasmonics Solid-state detectors Resonance techniques

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Valley filtering effect of phonons in graphene with a grain boundary

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Physical Review B 2019年第6期99卷 064302-064302页

作者： Xiaobin Chen Yong Xu Jian Wang Hong Guo State Key Laboratory on Tunable laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System School of Science Harbin Institute of Technology Shenzhen 518055 China Department of Physics and the Center of Theoretical and Computational Physics The University of Hong Kong Hong Kong China Collaborative Innovation Center of Quantum Matter and State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 People's Republic of China The University of Hong Kong Shenzhen Institute of Research and Innovation Shenzhen 518053 China College of Physics and Energy Shenzhen University Shenzhen 518060 China Department of Physics 3600 University McGill University Montreal Quebec H3A 2T8 Canada

Due to their possibility to encode information and realize low-energy-consumption quantum devices, control and manipulation of the valley degree of freedom have been widely studied in electronic systems. In contrast, the phononic counterpart—valley phononics—has been largely unexplored, despite the importance in both fundamental science and practical applications. In this work, we demonstrate that the control of “valleys” is also applicable for phonons in graphene by using a grain boundary. In particular, perfect valley filtering effect is observed at certain energy windows for flexural modes and found to be closely related to the anisotropy of phonon valley pockets. Moreover, valley filtering may be further improved using Fano-like resonance. Our findings reveal the possibility of valley phononics, paving the road towards purposeful phonon engineering and future valley phononics.

关键词： Ballistic transport Grain boundaries Phonons Valleytronics Graphene First-principles calculations Nonequilibrium Green's function

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