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Galvanic exchange process visualized on single silver nanoparticles via dark-field microscopic imaging

Abstract

The study of the galvanic exchange (GE) mechanism is beneficial for desingning and developing new bimetallic nanocrystal structures with excellent bifunctional catalytic properties. Herein, we visually demonstrated a GE process by real-time monitoring the reaction between silver nanoparticles (AgNPs) and Au3+ at single nanoparticle level using light scattering dark-field microscopic imaging. The localized surface plasmon resonance (LSPR) scattering spectral shifts of the AgNPs which make the Ag removal rate and Au deposition rate on the surface of the AgNPs can be revealed. Furthermore, a pixel meta three color channels method has been introduced for analyzing the scattering light color change of plasmonic particles to reveal the kinetics of the atomic deposition process on a single AgNP during GE, thus making the reaction kinetics of GE process could be directly observed. Therefore, this study provided an efficient and promising approach for understanding the GE mechanism and exploiting its reaction kinetics.

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Publication details

The article was received on 06 Mar 2018, accepted on 01 Jun 2018 and first published on 04 Jun 2018


Article type: Paper
DOI: 10.1039/C8NR01879K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Galvanic exchange process visualized on single silver nanoparticles via dark-field microscopic imaging

    J. Zhou, T. Yang, W. He, Z. Pan and C. Z. Huang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01879K

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