Redox state dependence of single molecule conductivity

被引:365
作者
Haiss, W [1 ]
van Zalinge, H [1 ]
Higgins, SJ [1 ]
Bethell, D [1 ]
Höbenreich, H [1 ]
Schiffrin, DJ [1 ]
Nichols, RJ [1 ]
机构
[1] Univ Liverpool, Dept Chem, Ctr Nanoscale Sci, Liverpool L69 7ZD, Merseyside, England
关键词
D O I
10.1021/ja038214e
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Spontaneous formation of stable molecular wires between a gold scanning tunneling microscopy (STM) tip and substrate is observed when the sample has a low coverage of α,ω-dithiol molecules and the tunneling resistance is made sufficiently small. Current?distance curves taken under these conditions exhibit characteristic current plateaux at large tip?substrate separations from which the conductivity of a single molecule can be obtained. The versatility of this technique is demonstrated using redox-active molecules under potential control, where substantial reversible conductivity changes from 0.5 to 2.8 nS were observed when the molecule was electrochemically switched from the oxidized to the reduced state. Copyright © 2003 American Chemical Society.
引用
收藏
页码:15294 / 15295
页数:2
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