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Oxidation kinetics of copper nanowires synthesized by AC electrodeposition of copper into porous aluminum oxide templates

Published online by Cambridge University Press:  01 June 2012

Xiaoxiong Luo ,
Uttandaraman Sundararaj  and
Jing-Li Luo
Xiaoxiong Luo
Affiliation:
Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada; and Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2G6, Canada
Uttandaraman Sundararaj*
Affiliation:
Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada
Jing-Li Luo
Affiliation:
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2G6, Canada
*
a)Address all correspondence to this author. e-mail: u.sundararaj@ucalgary.ca
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Abstract

Oxidation kinetics of copper nanowires (CuNWs) with diameter 25 ± 4 nm were studied. The dry powder of CuNWs before oxidation comprises 73.2 wt% Cu and 26.8 wt% Cu2O. The oxidation reaction can be divided into two stages at weight of 111.2%. Oxidized CuNWs after Stage 1 consist of Cu2O and CuO. Oxidized CuNWs after Stage 2 comprise CuO only. The activation energies for both stages are determined by Kissinger method and other five isoconversional methods: Flynn–Wall–Osawa, Starink, Kissinger–Akahira–Sunose, Boswell and Friedman differential methods. The isoconversional activation energies determined by Starink method are used to fit different master plots. The Johnson–Mehl–Avrami equation gives the best fit. Surface atoms are the sites for the random nucleation, and the crystallite strain in CuNWs is the driving force for the growth of nuclei during the oxidation process.

Keywords

oxidationkineticsnanostructure
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 13 , 14 July 2012 , pp. 1755 - 1762
Copyright
Copyright © Materials Research Society 2012

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