The investigation of redox reactions with a scanning tunneling microscope (original) (raw)

Journal of Electroanalytical Chemistry, 1992

Abstract

Abstract The tunneling current between the tip and a sample in a scanning tunneling microscope (STM) can be enhanced by the presence of an electroactive adsorbate on the sample. We have used the transfer Hamiltonian mechanism to determine the dependence of this current on various system parameters like the bias voltage, the energy of reorganization, and electronic coupling of the redox centre to the tip and the substrate. We estimate that a fast redox couple would rise give to currents in the pA to nA range; furthermore, the adsorbate density of states will be reflected in d j /d V . We also discuss experimental considerations in examining electron transfer via a redox adsorbate using an STM.

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