Ring Ultramicroelectrodes for Current-Blockade Particle-Impact Electrochemistry

Overview

Journal Anal Chem

Specialty Chemistry

Date 2022 Jul 6

PMID 35792954

Authors

Taghi Moazzenzade

Tieme Walstra

Xiaojun Yang

Jurriaan Huskens

Serge G Lemay

Affiliations

Soon will be listed here.

Abstract

In current-blockade impact electrochemistry, insulating particles are detected amperometrically as they impinge upon a micro- or nanoelectrode via a decrease in the faradaic current caused by a redox mediator. A limit of the method is that analytes of a given size yield a broad distribution of response amplitudes due to the inhomogeneities of the mediator flux at the electrode surface. Here, we overcome this limitation by introducing microfabricated ring-shaped electrodes with a width that is significantly smaller than the size of the target particles. We show that the relative step size is somewhat larger and exhibits a narrower distribution than at a conventional ultramicroelectrode of equal diameter.

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