caa a22 4500 606173714 CHVBK 20210128100734.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s11244-015-0419-4 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0419-4 Light-Induced Processes in Plasmonic Gold/TiO2 Photocatalysts Studied by Electron Paramagnetic Resonance [Elektronische Daten] [Ignacio Caretti, Maarten Keulemans, Sammy Verbruggen, Silvia Lenaerts, Sabine Van Doorslaer] 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 532nm 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. Springer Science+Business Media New York, 2015 EPR nationallicence Photocatalysis nationallicence Titanium dioxide nationallicence Plasmon nationallicence Gold nationallicence Caretti Ignacio BIMEF, Department of Physics, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium aut Keulemans Maarten Sustainable Energy and Air Purification, Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut Verbruggen Sammy Sustainable Energy and Air Purification, Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut Lenaerts Silvia Sustainable Energy and Air Purification, Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut Van Doorslaer Sabine BIMEF, Department of Physics, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/12-13(2015-09-01), 776-782 1022-5528 58:12-13<776 2015 58 11244 https://doi.org/10.1007/s11244-015-0419-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0419-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Caretti Ignacio BIMEF, Department of Physics, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium aut NATIONALLICENCE 700 1- Keulemans Maarten Sustainable Energy and Air Purification, Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut NATIONALLICENCE 700 1- Verbruggen Sammy Sustainable Energy and Air Purification, Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut NATIONALLICENCE 700 1- Lenaerts Silvia Sustainable Energy and Air Purification, Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut NATIONALLICENCE 700 1- Van Doorslaer Sabine BIMEF, Department of Physics, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/12-13(2015-09-01), 776-782 1022-5528 58:12-13<776 2015 58 11244