科研之友
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摘要
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/Ag,S-2/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 An electrodes which was separated with about 2 mu m 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.
