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Updated: Aug 11, 2026

Scanning-probe Single-electron Capacitance Spectroscopy
Published on: July 30, 2013
Impedance feedback control for scanning electrochemical microscopy
1Department of Chemistry, Mississippi State University, Mississippi State 39762, USA.
Abstract:
A new constant-distance imaging method based on the relationship between tip impedance and tip-substrate separation has been developed for the scanning electrochemical microscope. The tip impedance is monitored by application of a high-frequency ac voltage bias between the tip and auxiliary electrode. The high-frequency ac current is easily separated from the dc-level faradaic electrochemistry with a simple RC filter, which allows impedance measurements during feedback or generation/collection experiments. By employing a piezo-based feedback controller, we are able to maintain the impedance at a constant value and, thus, maintain a constant tip-substrate separation. Application of the method to feedback and generation/collection experiments with tip electrodes as small as 2 microm is presented.
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