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Spectroscopy of ultrathin epitaxial rutile TiO[sub 2](110) films grown on W(100)

Bennett, R. A., Mulley, J., Newton, M.A. and Surman, M. (2007) Spectroscopy of ultrathin epitaxial rutile TiO[sub 2](110) films grown on W(100). The Journal of Chemical Physics, 127 (8). 084707. ISSN 0021-9606

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To link to this item DOI: 10.1063/1.2756842

Abstract/Summary

Epitaxial ultrathin titanium dioxide films of 0.3 to similar to 7 nm thickness on a metal single crystal substrate have been investigated by high resolution vibrational and electron spectroscopies. The data complement previous morphological data provided by scanned probe microscopy and low energy electron diffraction to provide very complete characterization of this system. The thicker films display electronic structure consistent with a stoichiometric TiO2 phase. The thinner films appear nonstoichiometric due to band bending and charge transfer from the metal substrate, while work function measurements also show a marked thickness dependence. The vibrational spectroscopy shows three clear phonon bands at 368, 438, and 829 cm(-1) (at 273 K), which confirms a rutile structure. The phonon band intensity scales linearly with film thickness and shift slightly to lower frequencies with increasing temperature, in accord with results for single crystals. (c) 2007 American Institute of Physics.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:16788
Publisher:American Institute of Physics

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