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Volume 193, 2016
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Imaging electrocatalytic processes on single gold nanorods

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Abstract

Imaging electrochemical processes has attracted increasing attention in past decades. Particularly, monitoring electrochemical reactions rapidly at the nano-scale is still a challenge due to the ultra-low current detection and long scanning time required. The development of optical techniques provide a new way to demonstrate electrochemical processes through optical signals which enhance sensitivity and spatial resolution. Herein, we developed a novel method to image electrocatalytic processes on single gold nanorods (GNRs) during Cyclic Voltammetry (CV) scanning based on plasmon resonance scattering information by using dark-field microscopy. The electrocatalytic oxidation of hydrogen peroxide was selected as a typical reaction and the catalytic mechanism was revealed using the obtained spectra. Notably, observation on single GNRs avoided the averaging effects in bulk systems and confirmed that the individual nanoparticles had variable catalytic properties with different spectral change during the reaction process. Furthermore, a color-amplified system was introduced to convert light intensity into imaging information via the Matlab program which was able to image thousands of nanoparticles simultaneously. This approach offered the statistical intensity distribution of all of the nanoparticles in a dark-field image which dramatically enhanced the detection accuracy and avoided random events.

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Publication details

The article was received on 10 Apr 2016, accepted on 05 May 2016, published on 05 May 2016 and first published online on 05 May 2016


Article type: Paper
DOI: 10.1039/C6FD00069J
Citation: Faraday Discuss., 2016,193, 371-385
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    Imaging electrocatalytic processes on single gold nanorods

    C. Jing, Z. Gu and Y. Long, Faraday Discuss., 2016, 193, 371
    DOI: 10.1039/C6FD00069J

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