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  • Field emission from oxide nanowires: Mechanism and applications

    • 摘要:

      © 2018 IEEE. In this invited talk, our recent progresses in the research of field emission from several oxide nanowires and their applications in vacuum microelectronic devices will be reviewed. Field emission properties from of CuO, WO 3-x and ZnO nanowires were studied and their field emission mechanism were discussed. Applications of nanowire field emitter in gated field emitter, flat panel X-ray source and imaging detector were explored. Prototype of flat panel X-ray source using ZnO nanowire field emitters was fabricated and its high resolution imaging capability was demonstrated. The feasibility of a large area high-sensitive detector using ZnO nanowire field emitters is also verified.

    • 作者:

      Chen Jun;Chen Yicong;Lin Zhufan;Zhao Long;Chen Daokun;Wang Kun;Zhang Zhipeng;Zhang Guofu;She Juncong;Deng Shaozhi;Xu Ningsheng

    • 刊名:

      2018 31st International Vacuum Nanoelectronics Conference Ivnc 2018

    • 在线出版时间:

      2018

  • Resonance Coupling in Heterostructures Composed of Silicon Nanosphere and Monolayer WS 2 : A Magnetic-Dipole-Mediated Energy Transfer Process

    • 摘要:

      © 2019 American Chemical Society. Light-matter resonance coupling is a long-studied topic for both fundamental research and photonic and optoelectronic applications. Here we investigated the resonance coupling between the magnetic dipole mode of a dielectric nanosphere and 2D excitons in a monolayer semiconductor. By coating an individual silicon nanosphere with a monolayer of WS 2 , we theoretically demonstrated that, because of the strong energy transfer between the magnetic dipole mode of the nanosphere and the A-exciton in WS 2 , resonance coupling evidenced by anticrossing behavior in the scattering energy diagram was observed, with a mode splitting of 43 meV. In contrast to plexcitons, which involve plasmonic nanocavities, the resonance coupling in this all-dielectric heterostructure was insensitive to the spacing between the silicon nanosphere core and the WS 2 shell. Additionally, the two split modes exhibited distinct light-scattering directionality. We further experimentally demonstrated the resonance coupling effect by depositing silicon nanospheres with different diameters onto a WS 2 monolayer and collecting the scattering spectra of the resulting heterostructures under ambient conditions. We further demonstrated active control of the resonance coupling by temperature scanning. Our findings highlighted the potential of our all-dielectric heterostructure as a solid platform for studying strong light-matter interactions at the nanoscale.

    • 作者:

      Wang Hao;Wen Jinxiu;Xu Ningsheng;Chen Huanjun;Deng Shaozhi;Wang Weiliang;Liu Pu;Yan Jiahao

    • 刊名:

      ACS Nano

    • 在线出版时间:

      2019

  • Resonance coupling in hybrid gold nanohole–monolayer WS 2 nanostructures

    • 摘要:

      © 2019 The Authors Planar metallic nanoholes exhibit plasmonic resonances capable of confining electromagnetic fields down to the nanoscale, which can benefit the light–matter interactions at the nanoscale. In addition, they are more geometrically compatible with state-of-the-art microfabrication techniques in comparison with other types of plasmonic nanostructures of curved surfaces or protrusions. Two-dimensional transition metal dichalcogenides (TMDCs) are promising materials for studying light–matter interactions owing to their excellent optical properties. Herein, we propose a resonance plasmon–exciton coupling system based on the integration of monolayer tungsten disulfide (WS 2 ) with an individual plasmonic gold nanohole. Our results demonstrate that Rabi splitting exceeding 162 meV can be achieved in planar TMDC/metal nanostructures at room temperature. We believe that such hybrid systems provide a simple and robust single nanostructure design that can be used to manipulate light–matter interactions at the nanoscale.

    • 作者:

      Chen Xuexian;Wang Hao;Xu Ning-Sheng;Chen Huanjun;Deng Shaozhi

    • 刊名:

      Applied Materials Today

    • 在线出版时间:

      2019

  • A Controllable Solid-Source CVD Route to Prepare Topological Kondo Insulator SmB 6 Nanobelt and Nanowire Arrays with High Activation Energy

    • 摘要:

      Copyright © 2019 American Chemical Society. As a typical topological Kondo insulator, samarium hexaboride (SmB 6 ) is an ideal platform to investigate the interaction between strongly correlated electron states and topological surface states. Compared with their corresponding bulk counterparts, low-dimensional SmB 6 nanostructures have a larger surface-volume ratio, and thus they should possess more abundant surface states and remarkable quantum behaviors. But until now, few researches have been focused on the controllable growth techniques and electrical transport properties of the SmB 6 nanostructures, which keep them from rapid developments. In this study, we report a simple chemical vapor deposition technique to prepare single crystalline SmB 6 nanobelts and nanowires under control based on a solid-source route. The formation of the SmB 6 nanobelts is attributed to the synergistic effect of the vapor-liquid-solid (VLS) and vapor-solid (VS) mechanisms, whereas the VLS mechanism should be responsible for the formation of the SmB 6 nanowires. Electrical transport studies of these nanostructures reveal that their transportation curves have four different temperature regions due to the competition of the surface and bulk conduction. Because of the larger surface-to-volume ratio, these SmB 6 nanobelts and nanowires have much smaller residual resistance ratio than their bulk counterparts, and thus the temperature region dominated by the surface conduction also extends to higher temperatures up to 10 K. Moreover, the as-grown SmB 6 nanobelts (4.4 meV) and nanowires (3.1 meV) via our solid-source route are found to have much higher activation energy than the reported SmB 6 nanowires (about 2.5 meV). Under this circumstance, the surface conduction can play a bigger role in the electrical transport of SmB 6 , which is much beneficial for their future applications. This controllable solid-source synthesis route to fabricate the SmB 6 nanostructures may shed new light on modulating the morphology and electrical transport of other metal boride nanostructures.

    • 作者:

      Gan Haibo;Zhang Tong;Xu Ningsheng;Deng Shaozhi;Liu Fei;Ye Bicong;He Hongtao

    • 刊名:

      Crystal Growth and Design

    • 在线出版时间:

      2019

  • Defective WO 3-: X nanowire: Possible long lifetime semiconductor nanowire point electron source

    • 摘要:

      This journal is © The Royal Society of Chemistry. In pursuing high emission current density and high brightness, it is difficult to avoid vacuum breakdown in nanowire cold cathode systems, which will shorten the lifetime of the electron sources. Therefore, investigations on the vacuum breakdown process are important for semiconductor nanowire point electron sources. In this study, non-catastrophic breakdown phenomena that could extend the lifetime of the nanowire electron source were observed in the field emission processes of individual defective WO 3-x nanowires. In this non-catastrophic breakdown process, only part of the nanowire emitter was destroyed. After the breakdown, the remaining part of the nanowire could still emit electrons, and due to the shortening of its length, the maximum field emission current density of the remaining nanowire was increased. These results are consistent with the prediction given by theoretical calculations. A defect-related electrical transport induced breakdown mechanism and Nottingham effect induced cooling effect were proposed to be the main causes of this phenomenon. Our work provides an approach for designing long lifetime semiconductor nanowire point electron sources.

    • 作者:

      Lin Zufang;Zhan Runze;Chen Yicong;She Juncong;Deng Shaozhi;Xu Ningsheng;Chen Jun

    • 刊名:

      Nanoscale

    • 在线出版时间:

      2019

  • Effect of nanostructure building formation on high current field emission properties in individual molybdenum nanocones

    • 摘要:

      The building formation of a one-dimensional nanostructure greatly affects its physical properties. By controlling the supersaturation of deposited molybdenum (Mo) vapor, two kinds of nanostructure building formations can be synthesized in Mo nanocones (spiral- and stacking-type) through a thermal evaporation process. The field emission performances of these two formations are vastly different, particularly with respect to their high current properties. The maximum current of a spiral-type individual Mo nanocone is five times that of the stacking-type nanocone. Electrical transport may not be the decisive factor for this difference because both types of individual Mo nanocones have similar excellent conductivities. Heat conduction during the high current emission process has been considered a primary factor, and it strongly depends on the number of internal nanostructure boundaries in the Mo nanocone. These results indicate that nanostructure building formations with fewer inner boundaries in Mo nanocones contribute to a higher current field emission performance when applied to vacuum electron devices.

    • 作者:

      Yan Shen;宁生 许;少芝 邓;Shuai Tang;Yu Zhang;Fei Liu;军 陈

    • 刊名:

      ACS applied materials & interfaces

    • 在线出版时间:

      2015-2-18

  • Vacuum breakdown of carbon-nanotube field emitters on a silicon tip

    • 摘要:

      A study was performed on vacuum breakdown of carbon-nanotubes (CNT) field emitters on a silicon tip. The microwave plasma-enhanced chemical vapor deposition was used to grow CNT on the apex of a Si microtip. It was shown that the vacuum breakdown of the CNTs resulted in melting of the Si tip.

    • 作者:

      峻聪 佘;宁生 许;少芝 邓;军 陈;H. Bishop;S. E. Huq;L. Wang;D. Y. Zhong;恩哥 王

    • 刊名:

      Applied Physics Letters

    • 在线出版时间:

      2003-9-29

  • Optimization of CNT content in screen-printed carbon nanotube emitters for field emission display

    • 摘要:

      Carbon nanotube (CNT) cathodes with different CNT contents were prepared by screen-printing method. The relationships among microstructure, emission properties and electrical characteristics of screen-printed CNT cathode were studied. It is found electrical characteristics of cathodes are affected by CNT content, and only cathode with appropriate CNT content has good field emission properties.

    • 作者:

      Jun Yu;军 陈;L. F. Zhu;峻聪 佘;少芝 邓;宁生 许

    • 刊名:

    • 在线出版时间:

      2007

  • Monolayer MoS2 Dendrites on a Symmetry-Disparate SrTiO3 (001) Substrate

    • 摘要:

      Dendritic patterns generated in non-equilibrium growth processes are prevalent in nature while their formation mechanisms are far from fully understood. Here, we report a coverage-dependent fractal degree evolution of monolayer 2H-MoS2 dendrites synthesized on a symmetry-disparate substrate of SrTiO3 (001). Surprisingly, various characterizations have revealed that the monolayer dendrites featured with orthogonal backbones are single crystalline, possessing both peculiar adlayer-substrate interaction and abnormal indirect bandgap on SrTiO3 (001). Further theoretical calculations indicate that a prominent diffusion anisotropy of monomer precursors, combined with the disparate adlayer-substrate symmetry, determine the diffusion-limited aggregation of MoS2 towards dendritic shapes. This work provides brand-new insights in the morphological engineering of two-dimensional atomic crystals, and contributes greatly to an in-depth understanding of the detailed dynamics in non-equilibrium crystal growth.

    • 作者:

      Yu Zhang;Qingqing Ji;Jinxiu Wen;Jiu Li;Cong Li;Jianping Shi;Xiebo Zhou;Kebin Shi;Huanjun Chen;Yuanchang Li;少芝 邓;宁生 许;忠范 刘;Yanfeng Zhang

    • 刊名:

      Advanced Functional Materials

    • 在线出版时间:

      2016-5-17

  • Study of instability in the field electron emission from amorphous diamond films

    • 摘要:

      Details are given of an experimental study of the I-V characteristics and instability of the field electron emission from amorphous diamond films prepared using magnetic field-filtered ion deposition technique. A switch-on phenomenon is observed, and two types of instability are found, ie, fluctuation at low current and abrupt change in emission associated with local breakdown events at high current. Finally, it is found that, in order to establish a stable emission with current density approaching 50 mA/m2, it is necessary to undergo the switch-on and local breakdown process. These phenomena are characterized, and the physical mechanisms responsible for them are proposed.

    • 作者:

      军 陈;少芝 邓;X. G. Zhen;宁生 许

    • 刊名:

    • 在线出版时间:

      1998

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