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J Am Chem Soc. 2004 Feb 18;126(6):1606-7.

Evidence for molecularly chemisorbed oxygen on TiO2 supported gold nanoclusters and Au(111).

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1
Department of Chemical Engineering, The University of Texas at Austin, Center for Nano- and Molecular Science and Technology, 1 University Station CO400, Austin, TX 78712-0231, USA.

Abstract

In this study, we present evidence for the existence of a molecularly chemisorbed oxygen species on a Au/TiO2 model catalyst and a Au(111) single crystal following exposure of these samples to an oxygen plasma-jet molecular beam. We present evidence for the molecularly chemisorbed oxygen species from thermal desorption, collision-induced desorption, and heat of adsorption/reaction-induced desorption measurements. Thermal desorption measurements reveal a peak desorption temperature at approximately 145 K which corresponds to an activation energy for desorption of approximately 0.35 eV.

PMID:
14871071
DOI:
10.1021/ja039214h
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