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Photocatalytic Evidence of the Rutile-to-Anatase Electron Transfer in Titania

Quesada-Cabrera, R; Sotelo-Vazquez, C; Bear, JC; Darr, JA; Parkin, IP; (2014) Photocatalytic Evidence of the Rutile-to-Anatase Electron Transfer in Titania. Advanced Materials Interfaces , 1 (6) , Article 1400069. 10.1002/admi.201400069. Green open access

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Abstract

Layered anatase-rutile titania thin-films were synthesized via atmospheric-pressure chemical vapor deposition and characterized using X-ray diffraction, Raman spectroscopy and electron microscopy. The interposition of an amorphous TiO2-based interlayer allowed direct vapor deposition of anatase on a rutile substrate, which is otherwise hindered by templating. This resourceful approach and the subsequent crystallization of the amorphous layer after annealing of the films allowed investigation on the impact of an efficient interface of the two anatase-rutile phases in the photodegradation of a model organic pollutant. Clear evidence is presented on the synergy between the two polymorphs and more importantly, on the charge flow across the interface, which, against much conventional understanding, it involves electron transfer from rutile to anatase and is in agreement with a recent theoretical model and electron paramagnetic resonance data. Here, an increasing density of trapped electrons on the anatase surface of the A/R film is confirmed by photoreduction of silver. This observation is attributed to a defect-free efficient contact between the two phases and the presence of small rutile particles that promote rapid electron transfer at the A-R interface of the films.

Type: Article
Title: Photocatalytic Evidence of the Rutile-to-Anatase Electron Transfer in Titania
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/admi.201400069
Publisher version: http://dx.doi.org/10.1002/admi.201400069
Additional information: © 2014 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Keywords: photocatalytic thin-films; chemical vapor deposition; electron transfer; stearic acid; photodeposition of silver;
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1435372
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