Single nano-entity electrochemistry requires high-resolution and high-bandwidth current amplification due to the low magnitude and short duration of the current signals. However, increasing the current amplifier bandwidth leads to increased current noise levels, which in turn obscures the current signal generated from single nano-entity electrochemistry experiments. Noise levels are very sensible to the input capacitance of the current amplifier when operating at high bandwidth.<br/><br/>In this presentation, we introduce a new strategy to minimize the input capacitance to a current amplifier for stochastic collision electrochemistry. This is achieved by using a movable microscale electrochemical cell, formed at the end of a micropipette using a scanning electrochemical cell microscopy approach, to conduct electrochemical experiments in close proximity (~300 µm) to a custom design transimpedance amplifier. We demonstrated this via electro-oxidation of single Ag nanoparticles detected at 1 MHz bandwidth.

Scanning electrochemical cell microscopy (SECCM) architecture for microsecond resolution stochastic collision electrochemistry

ACS Spring Meeting 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.