Infrared reflection absorption spectroscopy studies of CO adsorption on titania thin films and gold clusters supported on titania
Date
1999
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Texas A&M University
Abstract
IRAS, MIES, and TPD studies were conducted on ultra-thin films of TiO₂(001) and TiO₂(001) films containing Au nanoclusters of varying size. Carbon monoxide was used as a probe molecule in all of these experiments. The IR data showed two distinct absorptions at 2180cm⁻¹ and 2110cm⁻¹. The 2180cm⁻¹ peak is assigned to CO adsorbed on Ti⁴⁺ sites The absorption at 2110cm⁻¹ appears to have at least two component peaks that may be from CO adsorbed on top of gold clusters and CO adsorbed at Au-TiO₂ interface sites. Experiments using TPD estimated the binding energy of CO to be 24.0kJ/mol. On gold clusters, the binding energy of CO was shown to vary according to cluster size. The binding energy of CO on gold was observed between 31. 1 and 38.4kJ/mol. MIES data did not show any substantial differences in the electronic properties of the TiO₂ or Au/TiO₂ surfaces when CO was adsorbed. It is however clear from the IRAS and TPD data that there are observable differences in these surfaces that are related to cluster size.
Description
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Includes bibliographical references (leaves 45-46).
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references (leaves 45-46).
Issued also on microfiche from Lange Micrographics.
Keywords
chemistry., Major chemistry.