Light-induced charge separation in anatase TiO2 particles.
作者： T. Berger , M. Sterrer , O. Diwald , E. Knözinger , D. Panayotov
DOI: 10.1021/JP0404293
关键词:
摘要: Ultraviolet light-induced electron−hole pair excitations in anatase TiO2 powders were studied by a combination of electron paramagnetic resonance and infrared spectroscopy measurements. During continuous UV irradiation the mW.cm-2 range, photogenerated electrons are either trapped at localized sites, giving Ti3+ centers, or remain conduction band as EPR silent species which may be observed their IR absorption. Using low temperatures (90 K) to reduce rate recombination processes, exhibit lifetimes hours. The EPR-detected holes produced photoexcitation O- species, from lattice O2- ions. It is found that under high vacuum conditions, major fraction photoexcited remains band. At 298 K, all stable hole states lost TiO2. Defect sites oxygen removal during annealing produce spectrum identi...
acs.org
sci-hub.se 参考文章(31)
Masakazu Anpo, Michel Che, Bice Fubini, Edoardo Garrone, Elio Giamello, Maria Cristina Paganini, Generation of superoxide ions at oxide surfaces Topics in Catalysis. ,vol. 8, pp. 189- 198 ,(1999) , 10.1023/A:1019117328935
Deanna C. Hurum, Alexander G. Agrios, Kimberly A. Gray, Tijana Rajh, Marion C. Thurnauer, Explaining the Enhanced Photocatalytic Activity of Degussa P25 Mixed-Phase TiO2Using EPR The Journal of Physical Chemistry B. ,vol. 107, pp. 4545- 4549 ,(2003) , 10.1021/JP0273934
D.M. Schleich, B. Walter, Formation of titania nanoparticles by vapor phase reactions of titanium tetraisopropoxide in oxygen/ozone containing atmospheres Nanostructured Materials. ,vol. 8, pp. 579- 586 ,(1997) , 10.1016/S0965-9773(97)00191-8
U. Diebold, N. Ruzycki, G.S. Herman, A. Selloni, One Step Towards Bridging the Materials Gap: Surface Studies of TiO2 Anatase Catalysis Today. ,vol. 85, pp. 93- 100 ,(2003) , 10.1016/S0920-5861(03)00378-X
Martin Sterrer, Oliver Diwald, Erich Knözinger, Peter V. Sushko, Alexander L. Shluger, Energies and Dynamics of Photoinduced Electron and Hole Processes on MgO Powders Journal of Physical Chemistry B. ,vol. 106, pp. 12478- 12482 ,(2002) , 10.1021/JP026733I
C. L. Suen, A. A. Adesina, Aqueous Phase Oxidative Degradation of 4-Hydroxy Nitrobenzene over a CuO-TiO2 Catalyst Developments in Chemical Engineering and Mineral Processing. ,vol. 6, pp. 85- 100 ,(2008) , 10.1002/APJ.5500060106
Akira Yamakata, Taka-aki Ishibashi, Hiroshi Onishi, Time-resolved infrared absorption spectroscopy of photogenerated electrons in platinized TiO2 particles Chemical Physics Letters. ,vol. 333, pp. 271- 277 ,(2001) , 10.1016/S0009-2614(00)01374-9
Ulrike Diebold, The surface science of titanium dioxide Surface Science Reports. ,vol. 48, pp. 53- 229 ,(2003) , 10.1016/S0167-5729(02)00100-0
Isao Nakamura, Nobuaki Negishi, Shuzo Kutsuna, Tatsuhiko Ihara, Shinichi Sugihara, Koji Takeuchi, Role of oxygen vacancy in the plasma-treated TiO2 photocatalyst with visible light activity for NO removal Journal of Molecular Catalysis A-chemical. ,vol. 161, pp. 205- 212 ,(2000) , 10.1016/S1381-1169(00)00362-9
Stephen Brunauer, P. H. Emmett, Edward Teller, Adsorption of Gases in Multimolecular Layers Journal of the American Chemical Society. ,vol. 60, pp. 309- 319 ,(1938) , 10.1021/JA01269A023