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

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...

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Bibliographic Details
Published inLangmuir Vol. 27; no. 13; pp. 8099 - 8104
Main Authors Fong, Yuen-Yan, Visser, Bradley R, Gascooke, Jason R, Cowie, Bruce C. C, Thomsen, Lars, Metha, Gregory F, Buntine, Mark A, Harris, Hugh H
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 05.07.2011
Subjects
Chemistry
Chlorides - chemistry
Exact sciences and technology
General and physical chemistry
Gold - chemistry
Gold Compounds - chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Kinetics
Oxidation-Reduction
Photochemistry
Silicon - chemistry
Spectrophotometry
Surface Properties
Synchrotrons
X-Rays
Sodium
Synchrotrons
Photoelectron spectrometry
X ray
Silicon
Kinetics
Chemical properties
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Summary: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.
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ISSN:0743-7463
1520-5827
DOI:10.1021/la200463k