The plasmon resonance of metal nanostructures affects neighboring semiconductors, quenching or enhancing optical transitions depending on various parameters. These plasmonic properties are currently investigated with respect to topics such as photovoltaics and optical detection and could also have important consequences for photocatalysis. Here the effect of silver nanoparticles of a size up to 30 nm and at maximum 0.50 monolayers on the photocatalytic oxidation of ethylene on TiO 2 is studied. Since the plasmon resonance energy of silver nanoparticles is comparable with the TiO 2 band gap, dipole-dipole interaction converts excitons into heat at the silver nanoparticle. This indicates that plasmonic interaction with TiO 2 semiconductor catalysts can reduce the photo catalytic activity considerably.

Quenching of TiO 2 photo catalysis by silver nanoparticles / M. Di Vece, A.B. Laursen, L. Bech, C.N. Maden, M. Duchamp, R.V. Mateiu, S. Dahl, I. Chorkendorff. - In: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. A, CHEMISTRY. - ISSN 1010-6030. - 230:1(2012 Feb 15), pp. 10-14. [10.1016/j.jphotochem.2011.12.025]

Quenching of TiO 2 photo catalysis by silver nanoparticles

M. Di Vece
Primo
;
2012

Abstract

The plasmon resonance of metal nanostructures affects neighboring semiconductors, quenching or enhancing optical transitions depending on various parameters. These plasmonic properties are currently investigated with respect to topics such as photovoltaics and optical detection and could also have important consequences for photocatalysis. Here the effect of silver nanoparticles of a size up to 30 nm and at maximum 0.50 monolayers on the photocatalytic oxidation of ethylene on TiO 2 is studied. Since the plasmon resonance energy of silver nanoparticles is comparable with the TiO 2 band gap, dipole-dipole interaction converts excitons into heat at the silver nanoparticle. This indicates that plasmonic interaction with TiO 2 semiconductor catalysts can reduce the photo catalytic activity considerably.
ehtylene; nanoparticle; oxidation; photo-catalysis; plasmonics; thin films; chemistry (all); chemical engineering (all); physics and astronomy (all)
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
15-feb-2012
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/438154
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