Hole-Mediated Photodecomposition of Trimethyl Acetate on a TiO2(001) Anatase Epitaxial Thin Film Surface

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• 作者：Takeo Ohsawa ; Igor V. Lyubinetsky ; Michael A. Henderson ; Scott A. Chambers
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：December 18, 2008
• 年：2008
• 卷：112
• 期：50
• 页码：20050-20056
• 全文大小：450K
• 年卷期：v.112,no.50(December 18, 2008)
• ISSN：1932-7455

文摘

Surfaces of titanium dioxide in both rutile and anatase polymorphs have attracted significant attention in catalysis and photochemistry. The (110) orientation of rutile, and to a lesser extent other rutile orientations, have been studied on an atomic scale, yielding information on surface structure and chemical reactivity. In contrast, the thermal and photochemistry of well-defined, single-crystal anatase surfaces has not been investigated, largely because of the metastable nature of anatase, as well as the lack of availability of high-quality surfaces. Here we describe a study of the adsorption and photoreactivity of an organic adlayer, trimethyl acetate (TMA), on structurally excellent anatase (001) epitaxial thin films grown by oxygen plasma assisted molecular beam epitaxy (OPAMBE). High-resolution scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and photodesorption spectrometry have been used to study the chemisorption and ultraviolet (UV) light-induced photodecomposition of TMA in ultrahigh vacuum. UV light promotes hole-mediated photodecomposition of TMA, resulting in decarboxylation to yield tert-butyl radical and CO₂. The photochemical rate constant is equal to that measured for OPAMBE grown rutile TiO₂(110) surfaces.