Optical excitations of metallic nanoclusters buried in TiO2for solar photochemistry

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Conference Proceeding

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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. © 2009 SPIE.

Publication Source (Journal or Book title)

Proceedings of SPIE - The International Society for Optical Engineering

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