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Correlated electrochemical and optical detection reveals the chemical reactivity of individual silver nanoparticles
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Brasiliense, Vitor, Patel, Anisha N., Martinez-Marrades, Ariadna, Shi, Jian, Chen, Yong, Combellas, Catherine, Tessier, Gilles and Kanoufi, Frédéric (2016) Correlated electrochemical and optical detection reveals the chemical reactivity of individual silver nanoparticles. Journal of the American Chemical Society, 138 (10). pp. 3478-3483. doi:10.1021/jacs.5b13217 ISSN 0002-7863.
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Official URL: http://dx.doi.org/10.1021/jacs.5b13217
Abstract
Electrochemical (EC) impacts of single nanoparticles (NPs) on an ultramicroelectrode are coupled with optics to identify chemical processes at the level of individual NPs. While the EC signals characterize the charge transfer process, the optical monitoring gives a complementary picture of the transport and chemical transformation of the NPs. This is illustrated in the case of electrodissolution of Ag NPs. In the simplest case, the optically monitored dissolution of individual NPs is synchronized with individual EC spikes. Optics then validates in situ the concept of EC nanoimpacts for sizing and counting of NPs. Chemical complexity is introduced by using a precipitating agent, SCN–, which tunes the overall electrodissolution kinetics. Particularly, the charge transfer and dissolution steps occur sequentially as the synchronicity between the EC and optical signals is lost. This demonstrates the level of complexity that can be revealed from such electrochemistry/optics coupling.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
Journal or Publication Title: | Journal of the American Chemical Society | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0002-7863 | ||||
Official Date: | 22 February 2016 | ||||
Dates: |
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Volume: | 138 | ||||
Number: | 10 | ||||
Page Range: | pp. 3478-3483 | ||||
DOI: | 10.1021/jacs.5b13217 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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