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Electrodeposition of metals from supercritical fluids

Jie Kea, Wenta Sua, Steven M.Howdlea, Michael W.Georgea, David Cookb, Magda Perdjon-Abelb, Philip N. Bartlettb, Wenjian Zhangb, Fei Chengb, William Levasonb, Gillian Reidb, Jason Hydec, James Wilsonc, David C.Smithc, Kanad Mallikd, and Pier Saziod

a. School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK
b. School of Chemistry, University of Southampton, UK
c. School of Astronomy and Physics, University of Southampton, UK
d. Optoelectronics Research Centre, University of Southampton, UK
Edited by Royce W. Murray, University of North Carolina, Chapel Hill, NC

Abstract

Electrodeposition is a widely used materials-deposition technology with a number of unique features, in particular, the efficient use of starting materials, conformal, and directed coating. The properties of the solvent medium for electrodeposition are critical to the technique’s applicability. Supercritical fluids are unique solvents which give a wide range of advantages for chemistry in general, and materials processing in particular. However, a widely applicable approach to electrodeposition from supercritical fluids has not yet been developed. We present here a method that allows electrodeposition of a range of metals from supercritical carbon dioxide, using acetonitrile as a co-solvent and supercritical difluoromethane. This method is based on a careful selection of reagent and supporting electrolyte. There are no obvious barriers preventing this method being applied to deposit a range of materials from many different supercritical fluids. We present the deposition of 3-nm diameter nanowires in mesoporous silica templates using this methodology.


PNAS (Proceedings of the National Academy of Sciences) (2009) Vol.106( 35) pp.14768-14772

doi: 10.1073/pnas.0901986106

Southampton ePrint id: 70885

 

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