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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 8
BKCSDE 32(8)
August 20, 2011 

Photoemission Study on the Adsorption of Ethanol on Chemically Modified TiO2(001) Surfaces
Ja Hyun Kong, Yu Kwon Kim *
Photoemission spectroscopy, Adsorption, Ethanol, TiO2(001)
Ethanol is a prototype molecule used in probing catalytic reactivity of oxide catalysts such as TiO2. In the present study, we adsorbed ethanol on TiO2(001) at room temperature (RT) and the corresponding bonding state of ethanol was systematically studied by x-ray photoemission spectroscopy (XPS) using synchrotron radiation. Especially, we compared TiO2(001) surfaces prepared in ultra-high vacuum (UHV) with different surface treatments such as Ar+-sputtering and oxidation with molecular O2, respectively. We find that the saturation coverage of ethanol at RT varies depending on the amount of reduced surface defects (e.g., Ti3+) which are introduced by Ar+-sputtering. We also find that the oxidized TiO2(001) surface has other type of surface defects (not related to Ti 3d state) which can dissociate ethanol for further reaction above 600 K. Our C 1s core level spectra indicate clearly resolved features for the two chemically distinct carbon atoms from ethanol adsorbed on TiO2(001), showing the adsorption of ethanol proceeds without C-C bond dissociation. No other C 1s feature for a possible oxidized intermediate was observed up to the substrate temperature of 650 K.
2531 - 2536
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