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Multifunctional P-Doped TiO2 films: a new approach to self-cleaning, transparent conducting oxide materials

Title: Multifunctional P-Doped TiO2 films: a new approach to self-cleaning, transparent conducting oxide materials
Authors: Sotelo-Vazquez, C
Noor, N
Kafizas, A
Quesada-Cabrera, R
Scanlon, DO
Taylor, A
Durrant, JR
Parkin, IP
Item Type: Journal Article
Abstract: Multifunctional P-doped TiO2 thin films were synthesized by atmospheric pressure chemical vapor deposition (APCVD). This is the first example of P-doped TiO2 films with both P5+ and P3– states, with the relative proportion being determined by synthesis conditions. This technique to control the oxidation state of the impurities presents a new approach to achieve films with both self-cleaning and TCO properties. The origin of electrical conductivity in these materials was correlated to the incorporation of P5+ species, as suggested by Hall Effect probe measurements. The photocatalytic performance of the films was investigated using the model organic pollutant, stearic acid, with films containing predominately P3– states found to be vastly inferior photocatalysts compared to undoped TiO2 films. Transient absorption spectroscopy studies also showed that charge carrier concentrations increased by several orders of magnitude in films containing P5+ species only, whereas photogenerated carrier lifetimes—and thus photocatalytic activity—were severely reduced upon incorporation of P3– species. The results presented here provide important insights on the influence of dopant nature and location within a semiconductor structure. These new P-doped TiO2 films are a breakthrough in the development of multifunctional advanced materials with tuned properties for a wide range of applications.
Issue Date: 22-Apr-2015
Date of Acceptance: 22-Apr-2015
URI: http://hdl.handle.net/10044/1/44737
DOI: http://dx.doi.org/10.1021/cm504734a
ISSN: 1520-5002
Publisher: American Chemical Society
Start Page: 3234
End Page: 3242
Journal / Book Title: Chemistry of Materials
Volume: 27
Issue: 9
Copyright Statement: © 2015 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/cm504734a
Sponsor/Funder: Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: 291482
EP/K039946/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
CHEMICAL-VAPOR-DEPOSITION
CHARGE-CARRIER DYNAMICS
TITANIA THIN-FILMS
PHOTOCATALYTIC ACTIVITY
VISIBLE-LIGHT
GLASS
DIOXIDE
SURFACE
WATER
COATINGS
Materials
03 Chemical Sciences
09 Engineering
Publication Status: Published
Appears in Collections:Chemistry
Faculty of Natural Sciences



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