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《Chemical Journal of Chinese Universities》 2007-06
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Studies on Interaction of Interface Between Porpyrin and TiO_2

LI Zi-Heng1,2,ZHOU Xiang-Dong1,WANG De-Jun3,ZOU Xu2, WANG Ying-Nan2,ZOU Guang-Tian2(1. College of Physics,2. National Key Lab for Superhard Materials,3. College of Chemistry,Jilin Univiersity,Changchun 130012,China)  
The absorption,photoluminescence and photovoltaic characteristics of porphyrin/TiO2 system were studied with absorption spectra,photoluminescence spectra and transient photovoltage technology,respectively,and the interaction of interface between porphyrin and TiO2 was also studied.The results obtained indicate that the interaction was different before and after Ho atom joined in porphyrin ring,the size of TiO2 also affected the interaction.When porphyrin was affected by TiO2 with 10 nm in diameter,its energy level was degenerated and band edge of porphyrin was red shifted,while it was affected by TiO2 with 56 nm and its energy level had little change.It indicates that the delocalizing interaction existed between the big pi bond of porphyrin and surface of TiO2 with 10 nm in diameter.The delocalizing interaction was also demonstrated via fluorescence spectra and transient photovoltage curves.Results are significant for the effective photo-electric conversion and study on the transfer of photogenerated carriers.
【Fund】: 国家自然科学基金(批准号:20473033);; 科技部国际合作项目(批准号:2001CB711201);; 教育部重点科学研究项目(批准号:03057)资助
【CateGory Index】: O621.2
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