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Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)

Changsha,China,10.16-10.18,2010

ISBN: 978-1-935068-41-9 Scientific Research Publishing, USA

E-Book 2313pp Pub. Date: October 2010

Category: Chemistry & Materials Science

Price: $360

Title: Influence of Surface Oxygen Vacancies on the Photocatalytic Activity of Nanocrystalline TiO2
Source: Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK) (pp 359-362)
Author(s): Hua-rong Zhang, Institute of Microsystemic Physics and School of Physics & Electronics, Henan University, Kaifeng 475001, People’s Republic of China
Hai-wu Zheng, School of Physics & Electronics, Henan University, Kaifeng 475001, People’s Republic of China
Yu-zong Gu, School of Physics & Electronics, Henan University, Kaifeng 475001, People’s Republic of China
Yong Liang, School of Physics & Electronics, Henan University, Kaifeng 475001, People’s Republic of China
Yu-rui Cao, School of Physics & Electronics, Henan University, Kaifeng 475001, People’s Republic of China
Ke-qi Tan, School of Physics & Electronics, Henan University, Kaifeng 475001, People’s Republic of China
Abstract: The influence of surface oxygen vacancies on the photo-generated charge carrier separation and photocatalytic activity in nanocrystalline TiO2 has been investigated in this work. The X-ray photoelectron spectra reveal that more surface oxygen vacancies are produced in the air-annealing sample compared to the oxygen-annealing sample. It is found that more oxygen vacancies produce more recombination centers, which causes weaker intensity of the surface photovoltaic spectroscopy signal in the air-annealing sample due to lower separation rate of photo-generated charge carriers. Simultaneously, more oxygen vacancies also yield more photocatalytic reactive centers and improve the photocatalytic activity for the air-annealing sample.
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