共 50 条
Multifunctional P-Doped TiO2 Films: A New Approach to Self-Cleaning, Transparent Conducting Oxide Materials
被引:119
作者:
Sotelo-Vazquez, Carlos
[1
]
Noor, Nuruzzaman
[1
]
Kafizas, Andreas
[1
,2
]
Quesada-Cabrera, Raul
[1
]
Scanlon, David O.
[3
,4
]
Taylor, Alaric
[5
]
Durrant, James R.
[2
]
Parkin, Ivan P.
[1
]
机构:
[1] UCL, Dept Chem, Mat Chem Res Ctr, London WC1H 0AJ, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England
[3] UCL, Dept Chem, Kathleen Lonsdale Mat Chem, London WC1H 0AJ, England
[4] Diamond Light Source Ltd, Didcot OX11 0DE, Oxon, England
[5] UCL, Dept Elect & Elect Engn, London WC1E 7JE, England
基金:
芬兰科学院;
英国工程与自然科学研究理事会;
关键词:
CHEMICAL-VAPOR-DEPOSITION;
CHARGE-CARRIER DYNAMICS;
TITANIA THIN-FILMS;
VISIBLE-LIGHT;
PHOTOCATALYTIC ACTIVITY;
DIOXIDE;
WATER;
SURFACE;
GLASS;
PHOTOANODES;
D O I:
10.1021/cm504734a
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
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 photbcatalytic 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.
引用
收藏
页码:3234 / 3242
页数:9
相关论文