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Volume 210, 2018
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The promise of antireflective gold electrodes for optically monitoring the electro-deposition of single silver nanoparticles

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Abstract

The interest in nano-objects has recently dramatically increased in all fields of science, and electrochemistry is no exception. As a consequence, in situ and operando visualization of electrochemical processes is needed at the nanoscale. Herein, we propose a new interferometric microscopy based on an antireflective thin metal electrode layer. The technique is coupled to electrochemistry in a model example: the electro-deposition of Ag metallic nanoparticles (NPs). This challenges the current opto-electrochemical methods and even those relying on nano-impact detection. Indeed, the sensitivity allows the dynamic in situ visualization of the electrochemical growth and dissolution of individual Ag NPs, whose size was tracked dynamically down to 15 nm in diameter. The use of microelectrodes provides interesting quantitative analysis of the NPs, from optically resolved arrays of single NPs to condensed arrays of (unresolved) NPs. Particularly, the optical analysis of all the individual NPs allows the reconstruction of optical voltammograms similar to the electrochemical ones. Finally, the NP dissolution–redeposition is also investigated.

Graphical abstract: The promise of antireflective gold electrodes for optically monitoring the electro-deposition of single silver nanoparticles

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Article information


Submitted
18 Feb 2018
Accepted
01 Mar 2018
First published
05 Jul 2018

Faraday Discuss., 2018,210, 381-395
Article type
Paper

The promise of antireflective gold electrodes for optically monitoring the electro-deposition of single silver nanoparticles

J. Lemineur, J. Noël, C. Combellas, D. Ausserré and F. Kanoufi, Faraday Discuss., 2018, 210, 381
DOI: 10.1039/C8FD00037A

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