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Elucidation of the electrodeposition mechanism of molybdenum oxide from iso- and peroxo-polymolybdate solutions

Published online by Cambridge University Press:  03 March 2011

Todd M. McEvoy  and
Keith J. Stevenson
Todd M. McEvoy
Affiliation:
Department of Chemistry and Biochemistry, Center for Nano- and Molecular Science and Technology, Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712
Keith J. Stevenson*
Affiliation:
Department of Chemistry and Biochemistry, Center for Nano- and Molecular Science and Technology, Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712
*
a) Address all correspondence to this author. e-mail: stevenson@mail.cm.utexas.edu This paper is based on a presentation given in Symposium Z at the Spring 2003 MRS meeting.
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Abstract

The cathodic electrodeposition of molybdenum oxide thin films prepared from aqueous solutions containing iso-polymolybdates and peroxo-polymolybdates is described. Chronocoulometry, x-ray photoelectron spectroscopy, spectroelectrochemistry, and electrochemical quartz crystal microgravimetry were used to establish corresponding reaction mechanisms for films grown at different deposition potentials. Electrodeposition from acidified iso-polymolybdate solutions proceeds by the reduction of molybdic acid, whereas deposition from aqueous peroxo-based solutions involves the graded reduction of several solution components, primarily comprising molybdic acid and peroxo-polymolybdates. Careful regulation of the deposition potential allows for controlled growth of distinct molybdenum oxide compositions producing films with varied water content and valency.

Keywords

Electrochemical synthesisMolybdenum oxideNucleation & growth

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Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 2 , February 2004 , pp. 429 - 438
Copyright
Copyright © Materials Research Society 2004

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