高等学校化学学报

高等学校化学学报

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微芯片上Ag2S电化学纳米开关的构筑及电学测量的初步研究

孔德生1,2, 田景华1, 刘波1, 刘海林1, 陈招斌1, 毛秉伟1, 田中群1   

    1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 厦门 361005;
    2. 曲阜师范大学化学系, 曲阜 273165
  • 收稿日期:2006-01-12 修回日期:1900-01-01 出版日期:2007-01-10 发布日期:2007-01-10
  • 通讯作者: 田中群

A Preliminary Study on Fabrication and Electronic Measurements of a Ag2S Nanoelectrochemical Switch

KONG De-Sheng1,2, TIAN Jing-Hua1, LIU Bo1, LIU Hai-Lin1, CHEN Zhao-Bin1, MAO Bing-Wei1, TIAN Zhong-Qun1   

    1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005, China;
    2. Department of Chemistry, Qufu Normal University, Qufu 273165, China
  • Received:2006-01-12 Revised:1900-01-01 Online:2007-01-10 Published:2007-01-10
  • Contact: TIAN Zhong-Qun

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摘要： 初步探索了利用电化学方法“自下而上”地构筑了Au/Ag/Ag2S-Au固体电化学纳米开关, 并确定了较适宜的开关工作条件. 小于1 nm的Ag2S-Au间隔是Ag2S开关器件的关键结构, 以保证电子的量子遂穿和间隔中Ag凸起的生长与收缩. 测量结果表明, Ag2S开关转换具有较好的可逆性和稳定性, 开关转换电流相差3个数量级以上.

关键词: Ag2S, 纳米开关, 电化学, 电沉积

Abstract: Nanoelectronics is an important area of research in nanotechnology and nanoscience, in which nano structures with electronics functionality are designed and fabricated. In this paper, a Au/Ag/Ag2S/Au solid-state electrochemical nanoswitch was constructed by using electrochemical methods from the “bottom-up” approach. The Ag2S nanoelectrochemical switch fabricating procedure includes three steps: (1) A silver layer was electrodeposited on one of a pair of facing Au electrodes which was separated with about 2 μm gap width; (2) the surface of the silver layer was then converted to Ag2S by electrochemical oxidation in a basic Na2S solution; (3) the gap was narrowed down to about 1 nm by electrodepositing Au atoms on to the other one of the facing pair electrodes. It is demonstrated that such a device can switch between “on” and “off” states at room temperature and in air. A gap of 1 nm is the key structure of the switch. The Ag2S switch works by controlling the formation and annihilation of an atomic Ag-bridge at the tip point between two electrodes. The reversibility and stability of the switch is satisfactory with a current difference between “on” and “off” states more than three orders of magnitude.

Key words: Ag2S, Nanoswitch, Electrochemistry, Electrodeposition

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