Single molecule electrochemistry

被引:168
作者
Fan, FRF
Kwak, J
Bard, AJ
机构
[1] UNIV TEXAS, DEPT CHEM & BIOCHEM, AUSTIN, TX 78712 USA
[2] KOREA ADV INST SCI & TECHNOL, DEPT CHEM, TAEJON 305701, SOUTH KOREA
关键词
D O I
10.1021/ja9610794
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
By using specially constructed nanometer tips of sharpened Pt-Ir wire in a wax sheath, small numbers of molecules (1-10) can be trapped between the tip and a substrate. Repeated electron transfers of an electroactive molecule as it shuttles by diffusion between tip and substrate produce a current (similar to 0.6 pA/molecule) that can be used to detect the trapped molecules. The tip electrode size and shape can be found from the electrode approach curves (current vs tip-to-substrate distance) based on approximate equations and digital simulations. Analysis of the observed fluctuating currents by autocorrelation, spectral density, and probability density functions is also described.
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页码:9669 / 9675
页数:7
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