卟啉/TiO_2界面的相互作用研究  

Studies on Interaction of Interface Between Porpyrin and TiO_2

作　　者：李子亨[1] 周向东[1] 王德军[2] 邹旭[3] 王英楠[3] 邹广田[3] 

机构地区：[1]吉林大学物理学院 [2]吉林大学化学学院,长春130012 [3]吉林大学超硬材料国家重点实验室,长春130012

出　　处：《高等学校化学学报》2007年第6期1151-1154,共4页Chemical Journal of Chinese Universities

基　　金：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

摘　　要：采用吸收光谱、荧光光谱和瞬态光伏技术研究了卟啉/TiO2体系的吸收光特性、荧光特性和光伏特性,并研究了卟啉和TiO2之间的界面相互作用.研究结果表明,卟啉环在与钬原子结合前后与TiO2之间的作用不同,TiO2的粒径也影响界面的相互作用.卟啉与粒径为10nm的TiO2作用后,能级发生了简并,同时带隙发生了红移.卟啉与粒径为56nm的TiO2相互作用后只有特征吸收峰发生红移,带隙和峰的数量几乎未发生变化.这说明在粒径为10nm的TiO2与卟啉的大π键之间出现了离域的相互作用,这也被荧光光谱和瞬态光伏曲线所证实.The absorption, photoluminescence and photovohaic characteristics of porphyrin/TiO2 system were studied with absorption spectra, photoluminescence spectra and transient photovohage technology, respective-ly, 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 affect-ed the interaction. When porphyrin was affected by TiO2 with 10 nm in diameter, its energy level was degener-ated 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 l0 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.

关 键 词：界面 相互作用 能级简并 电荷转移 表面键合 

分 类 号：O643[理学—物理化学]