Single molecule electrochemistry

2020-03-30 07:50:15

Feedback substrate tip molecule Dept

责任者: Fan, FRF;Kwak, J;Bard, AJ 单位: UNIV TEXAS,DEPT CHEM & BIOCHEM,AUSTIN,TX 78712.;KOREA ADV INST SCI & TECHNOL,DEPT CHEM,TAEJON 305701,SOUTH KOREA. 来源出处: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v 118, OCT 9 1996, p 9669- 9675 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. 关键词: carbon clusters; field evaporation; graphite; scanning tunneling microscopy microscopy; SCANNING TUNNELING MICROSCOPY; OPTICAL MICROSCOPY; POLYMER-FILMS; FEEDBACK MODE; ELECTRODES; SPECTROSCOPY; MICROELECTRODE; SURFACE; SCALE FEEDBACK MODE; ELECTRODES; SPECTROSCOPY; MICROELECTRODE; SURFACE; SCALE