Ben-Jaber, S;
Glass, D;
Brick, T;
Maier, SA;
Parkin, IP;
Cortés, E;
Peveler, WJ;
(2023)
Photo-induced enhanced Raman spectroscopy as a probe for photocatalytic surfaces.
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
, 381
(2259)
, Article 20220343. 10.1098/rsta.2022.0343.
(In press).
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Abstract
Photo-induced enhanced Raman spectroscopy (PIERS) has emerged as a highly sensitive surface-enhanced Raman spectroscopy (SERS) technique for the detection of ultra-low concentrations of organic molecules. The PIERS mechanism has been largely attributed to UV-induced formation of surface oxygen vacancies (Vo) in semiconductor materials, although alternative interpretations have been suggested. Very recently, PIERS has been proposed as a surface probe for photocatalytic materials, following Vo formation and healing kinetics. This work establishes comparison between PIERS and Vo-induced SERS approaches in defected noble-metal-free titanium dioxide (TiO2-x) films to further confirm the role of Vo in PIERS. Upon application of three post-treatment methods (namely UV-induction, vacuum annealing and argon etching), correlation of Vo kinetics and distribution could be established. A proposed mechanism and further discussion on PIERS as a probe to explore photocatalytic materials are also presented. This article is part of the theme issue 'Exploring the length scales, timescales and chemistry of challenging materials (Part 2)'.
| Type: | Article |
|---|---|
| Title: | Photo-induced enhanced Raman spectroscopy as a probe for photocatalytic surfaces |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1098/rsta.2022.0343 |
| Publisher version: | https://doi.org/10.1098/rsta.2022.0343 |
| Language: | English |
| Additional information: | © 2023 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. |
| Keywords: | defected titanium dioxide, oxygen vacancies, photo-induced enhanced Raman spectroscopy, photocatalysis, surface-enhanced Raman spectroscopy |
| 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 |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10177236 |
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