Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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



Steve Y. Rhieu, Vytas Reipa


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.
Journal of Physical Chemistry Letters


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