Title
Light-induced processes in plasmonic <tex>$Gold/TiO_{2}$</tex> photocatalysts studied by electron paramagnetic resonanceLight-induced processes in plasmonic <tex>$Gold/TiO_{2}$</tex> photocatalysts studied by electron paramagnetic resonance
Author
Faculty/Department
Faculty of Sciences. Physics
Faculty of Sciences. Bioscience Engineering
Research group
Biophysics and Biomedical Physics
Sustainable Energy, Air and Water Technology
Publication type
article
Publication
Dordrecht,
Subject
Physics
Source (journal)
Topics in catalysis. - Dordrecht
Volume/pages
58(2015):12, p. 776-782
ISSN
1022-5528
ISI
000360011200008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
X-band and W-band continuous-wave (CW) electron paramagnetic resonance (EPR) was used to study in situ light-induced (LI) mechanisms in commercial P90 titania (90 % anatase/10 % rutile) compared to plasmon-enhanced Au-P90 photocatalyst. These materials were excited using UV and 532 nm visible light to generate different excitation states and distinguish pure charge separation from plasmon-assisted resonance processes. Up to nine different photoinduced species of trapped electrons and holes were identified. LI CW EPR of P90 is presented for the first time, showing a UV excitation response similar to the well-known mixed-phase P25 titania. It is shown that incorporation of Au nanoparticles in Au-P90 and formation of a Schottky junction affects the charge separation state of the catalyst under UV light. Moreover, Au impregnation activated P90 through plasmon hot electron injection under visible light excitation (plasmonic sensitization effect). In general, EPR proved to be crucial to determine the different photoexciation paths and reactions that regulate plasmonic photocatalysis.
E-info
https://repository.uantwerpen.be/docman/iruaauth/08f53a/607c8475167.pdf
Full text (open access)
https://repository.uantwerpen.be/docman/irua/f7a2c4/127413.pdf
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