Photoreduction Kinetics of Sodium Tetrachloroaurate under Synchrotron Soft X-ray Exposure

Fong, Y.; Visser, B.; Gascooke, J.; Cowie, B.; Thomsen, L.; Metha, G.; Buntine, Mark; Harris, H.

doi:10.1021/la200463k

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Authors

Fong, Y.

Visser, B.

Gascooke, J.

Cowie, B.

Thomsen, L.

Metha, G.

Buntine, Mark

Harris, H.

Date

2011

Type

Journal Article

Metadata

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Citation

Fong, Yuen-Yan and Visser, Bradley R. and Gascooke, Jason R. and Cowie, Bruce C.C. and Thomsen, Lars and Metha, Gregory F. and Buntine, Mark A. and Harris, Hugh H. 2011. Photoreduction Kinetics of Sodium Tetrachloroaurate under Synchrotron Soft X-ray Exposure. Langmuir. 27 (13): pp. 8099-8104.

Source Title

Langmuir

DOI

10.1021/la200463k

ISSN

07437463

School

Department of Applied Chemistry

Remarks

The website for the Langmuir journal is available at: http://pubs.acs.org/Langmuir

URI

http://hdl.handle.net/20.500.11937/3285

Collection

Curtin Research Publications

Abstract

We report on the time evolution of the sodium tetrachloroaurate (NaAuCl4) chemical properties as a function of soft X-ray exposure in a dried sample on a silicon surface using X-ray photoelectron spectroscopy (XPS). Our investigations provide mechanistic insight into the photoreduction kinetics from AuIII to AuI and then AuI to Au0. We unambiguously show that XPS photoreduction occurs in stepwise fashion via the AuI state. Both photoreduction steps undergo first-order kinetics.