Related Experiment Video
Updated: Sep 5, 2025

Precise Electrochemical Sizing of Individual Electro-Inactive Particles
Published on: August 4, 2023
Ring Ultramicroelectrodes for Current-Blockade Particle-Impact Electrochemistry
Taghi Moazzenzade1, Tieme Walstra1, Xiaojun Yang1
1MESA+ Institute and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
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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