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Impact and oxidation of single silver nanoparticles at electrode surfaces : one shot versus multiple events
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Ustarroz, Jon, Kang, Minkyung, Bullions, Erin and Unwin, Patrick R. (2017) Impact and oxidation of single silver nanoparticles at electrode surfaces : one shot versus multiple events. Chemical Science, 8 (3). pp. 1841-1853. doi:10.1039/C6SC04483B ISSN 2041-6520.
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Official URL: http://dx.doi.org/10.1039/C6SC04483B
Abstract
Single nanoparticle (NP) electrochemical impacts is a rapidly expanding field of fundamental electrochemistry, with applications from electrocatalysis to electroanalysis. These studies, which involve monitoring the electrochemical (usually current–time, I–t) response when a NP from solution impacts with a collector electrode, have the scope to provide considerable information on the properties of individual NPs. Taking the widely studied oxidative dissolution of individual silver nanoparticles (Ag NPs) as an important example, we present measurements with unprecedented noise (< 5 pA) and time resolution (time constant 100 μs) that are highly revealing of Ag NP dissolution dynamics. Whereas Ag NPs of diameter, d = 10 nm are mostly dissolved in a single event (on the timescale of the measurements), a wide variety of complex processes operate for NPs of larger diameter (d ≥ 20 nm). Detailed quantitative analysis of the I–t features, consumed charge, event duration and impact frequency leads to a major conclusion: Ag NPs undergo sequential partial stripping (oxidative dissolution) events, where a fraction of a NP is electrochemically oxidized, followed by the NP drifting away and back to the tunnelling region before the next partial stripping event. As a consequence, analysis of the charge consumed by single events (so-called “impact coulometry”) cannot be used as a general method to determine the size of colloidal NPs. However, a proper analysis of the I–t responses provides highly valuable information on the transient physicochemical interactions between NPs and polarized surfaces.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QD Chemistry | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||
| Library of Congress Subject Headings (LCSH): | Electrochemistry, Nanoparticles | ||||||||
| Journal or Publication Title: | Chemical Science | ||||||||
| Publisher: | Royal Society of Chemistry | ||||||||
| ISSN: | 2041-6520 | ||||||||
| Official Date: | 2017 | ||||||||
| Dates: |
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| Volume: | 8 | ||||||||
| Number: | 3 | ||||||||
| Page Range: | pp. 1841-1853 | ||||||||
| DOI: | 10.1039/C6SC04483B | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 19 October 2017 | ||||||||
| Date of first compliant Open Access: | 20 October 2017 | ||||||||
| Funder: | Fonds Wetenschappelijk Onderzoek (FWO), University of Warwick Chancellor’s Interational Scholarship | ||||||||
| Grant number: | Grant No. 12I7816N (FWO) |
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