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20 August 2009 Optical excitations of metallic nanoclusters buried in TiO2 for solar photochemistry
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Ag deposited on TiO2(110) forms nanoclusters ~5 nm across and 2 nm in height, shown by STM. These nanoclusters exhibit a plasmon loss at 3.8 eV as determined by EELS yet the substrate Fuchs-Kliewer phonon modes remain, indicating that the exposed TiO2 is not perturbed by the Ag clusters. Titania is grown on top of these clusters by evaporation of Ti and subsequent oxidation and both EELS and optical measurements show that new excitations are produced in the 1.5-2 eV range, a much better match to the solar spectrum than the 3.8 eV Ag plasmon. AFM measurements indicate that the Ag clusters retain their morphology upon titania coating.
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Fei Wang, Frank Womack, Phillip T. Sprunger, and Richard L. Kurtz "Optical excitations of metallic nanoclusters buried in TiO2 for solar photochemistry", Proc. SPIE 7408, Solar Hydrogen and Nanotechnology IV, 74080G (20 August 2009);

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