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Single molecule electrochemistry
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DOI：10.1021/ja9610794.png)
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Abstract
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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.
Keywords:
SCANNING TUNNELING MICROSCOPY
OPTICAL MICROSCOPY
POLYMER-FILMS
FEEDBACK MODE
ELECTRODES
SPECTROSCOPY
MICROELECTRODE
SURFACE
SCALE
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