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Single Ag Nanoparticle Collisions within a Dual-Electrode Micro-Gap Cell

Abstract

An adjustable width (between 600 nm and 20 µm) gap between two Au microelectrodes is used to probe the electrodissolution dynamics of single Ag nanoparticles. One Au microelectrode is used to drive the oxidation and subsequent dissolution of a single Ag nanoparticle, which displays a multi-peak oxidation behavior, while a second Au microelectrode is used to collect Ag+ that is produced. Careful analysis of the high temporal resolution current-time traces reveals capacitive coupling between electrodes due to the sudden injection of Ag+ ions into the gap between the electrodes. The current-time traces allow measurement of the effect of citrate concentration on the electrodissolution dynamics of a single Ag nanoparticle, which reveals the presence of 2 mM citrate significantly slows down the release of Ag+. Intriguingly, these experiments also reveal that only a portion (ca. 50%) of the oxidized Ag nanoparticle is released as free Ag+ regardless of citrate concentration.

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Publication details

The article was accepted on 12 Feb 2018 and first published on 26 Feb 2018


Article type: Paper
DOI: 10.1039/C8FD00014J
Citation: Faraday Discuss., 2018, Accepted Manuscript
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    Single Ag Nanoparticle Collisions within a Dual-Electrode Micro-Gap Cell

    K. McKelvey, D. A. Robinson, N. J. Vitti, M. A. Edwards and H. White, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00014J

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