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Tuning the size of gold nanoparticles with repetitive oxidation-reduction cycles

Published

Author(s)

Steve Y. Rhieu, Vytas Reipa

Abstract

A simple method to control the size of gold nanoparticles (AuNP) using repetitive oxidation-reduction cycles is described. First, AuNP are shown to be readily immobilized onto an indium-doped tin oxide (ITO) coated glass surface using cyclic voltammetry in nanoparticle-containing citrate buffer. Subsequently, the size of AuNP attached to the ITO surface can be reduced to a desired level by potential cycling in the range from 0 V to +1.1 V (vs. Ag/AgCl). Gradual decrease in AuNP diameter was attributed to the formation of gold oxide upon anodic potential sweep and the partial solubilization of the Au(III) species during subsequent reduction of gold oxide in the absence of gold chelator (e.g. Cl-, Br-, or CN-) normally necessary for anodic gold dissolution.
Citation
Journal of Physical Chemistry Letters

Citation

Rhieu, S. and Reipa, V. (2015), Tuning the size of gold nanoparticles with repetitive oxidation-reduction cycles, Journal of Physical Chemistry Letters, [online], https://doi.org/10.12691/ajn-3-1-2 (Accessed April 22, 2024)
Created March 30, 2015, Updated October 12, 2021