Coupled electrooxidation and electrical conduction in a single gold nanowire

Nano Letters
Chengxiang XiangR M Penner

Abstract

The resistance, R, of single gold nanowires was measured in situ during electrooxidation in aqueous 0.10 M sulfuric acid. Electrooxidation caused the formation of a gold oxide that is approximately 0.8 monolayers (ML) in thickness at +1.1 V vs saturated mercurous sulfate reference electrode (MSE) based upon coulometry and ex situ X-ray photoelectron spectroscopic analysis. As the gold nanowires were electrooxidized, R increased by an amount that depended on the wire thickness, ranging from Delta R/ R 0.10V = 14% for a 63 nm (h) x 200 nm (w) wire to 57% for an 18 nm (h) x 95 nm (w) wire at +1.1 V. These nanowires were millimeters in total length, but just 46 microm lengths were exposed to the electrolyte solution. The oxidation process and the accompanying increase in R were reversible: Reduction of the oxide at +0.10 V resulted in recovery of the reduced wire R except for a small resistance offset caused by the dissolution of approximately 0.4 ML of gold during each oxidation/reduction cycle. The measured increase in R during oxidation exceeds by a factor of 4 the predicted increases in R associated with the reduction in cross-sectional area of the nanowire and the expected decrease in the specular scattering parameter, p, at t...Continue Reading

References

Oct 24, 2006·Nature Materials·E J MenkeR M Penner

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Citations

Jul 13, 2012·Nano Letters·Mazin M MaqablehBethanie J H Stadler
Feb 14, 2009·Chemical Communications : Chem Comm·Chengxiang XiangReginald M Penner
May 14, 2014·Annual Review of Analytical Chemistry·Karen Dawson, Alan O'Riordan
Oct 22, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·David A MarshA S Borovik
Jan 17, 2017·Journal of the American Chemical Society·Yixian WangNongjian Tao
Sep 25, 2017·ACS Applied Materials & Interfaces·Ji-Soo JangReginald M Penner

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