Ring Ultramicroelectrodes for Current-Blockade Particle-Impact Electrochemistry

Taghi Moazzenzade, Tieme Walstra, Xiaojun Yang, Jurriaan Huskens*, Serge G. Lemay

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
12 Downloads (Pure)


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.

Original languageEnglish
Pages (from-to)10168-10174
Number of pages7
JournalAnalytical chemistry
Issue number28
Publication statusPublished - 19 Jul 2022


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