Publication date: 31st March 2013
Model nanocomposite photocatalysts consisting of undoped TiO2 films and optically active Ag or Au nanoparticles (NPs) were designed, fabricated and examined in order to address the role of plasmon excitation in their performance. Different composition schemes were tested in which the NPs were either facing the reaction environment or not, and in direct contact or not with TiO2 (encapsulated by a thin SiO2 layer). We found, as measured for the reactions of methanol and ethylene oxidation in two different photoreactors, that composites always show enhanced activity (up to x100 for some schemes) compared to bare TiO2. We deduced from in situ localized surface plasmon resonance (LSPR) spectroscopy measurements that the interfacial charge transfer from TiO2 to NPs plays major role for the enhancement for composition schemes where particles are in direct contact with TiO2. Plasmonic near- and far-field effects were observed only when plasmon resonance energy overlaps with the bandgap energy of undoped TiO2.
Three characteristic arrangements of plasmonic NPs in the model photocatalysts tested in the study.
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