微芯片上Ag_2S电化学纳米开关的构筑及电学测量的初步研究  

A Preliminary Study on Fabrication and Electronic Measurements of a Ag_2S Nanoelectrochemical Switch

作　　者：孔德生[1] 田景华[1] 刘波[1] 刘海林[1] 陈招斌[1] 毛秉伟[1] 田中群[1] 

机构地区：[1]厦门大学化学系固体表面物理化学国家重点实验室

出　　处：《高等学校化学学报》2007年第1期149-152,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20021002;20328306)资助

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.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 solidstate electrochemical nanoswitch was constructed by using electrochemical methods from the ＂bottom-up＂ approach. The Ag2S 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 lution ; （ 3 ） the gap was narrowed down to about 1 nm by el facing pair electrodes. It is demonstrated that such a device ectrodepositing Au atoms on to the other one of the 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.

关 键 词：AG2S 纳米开关 电化学 电沉积 

分 类 号：O646[理学—物理化学]