Molecular Aggregation State and Electrical Properties of Terthiophenes/Imogolite Nanohybrids
作者:Weng On Yah、Atsushi Irie、Nattha Jiravanichanun、Hideyuki Otsuka、Atsushi Takahara
DOI:10.1246/bcsj.20110080
日期:2011.9.15
Organic/inorganic nanohybrid materials composed of terthiophenes and imogolite were prepared by means of specific surface interaction between a phosphonic acid group in terthiophene derivatives and aluminol groups on the surface of imogolite. The new materials were investigated by FTIR, UV–vis absorption, fluorescence spectroscopy, TEM observation, nitrogen adsorption–desorption, and I–V measurement. Addition of terthiophene of phosphonic acid derivatives into imogolite brought some changes in absorption and photoluminescence spectra, suggesting the formation of H-type aggregate on imogolite surface. The analysis of UV–vis spectra and nitrogen adsorption–desorption data provided insight into the effect of molecular structure of terthiophenes on the adsorption and aggregation behaviors on the imogolite surface. In addition, a significant enhanced current flow was observed through imogolite film when imogolite was chemisorbed by electron-withdrawing terthiophenes. In contrast, current flow decreased as the electron-donating terthiophene was chemisorbed on imogolite. A possible mechanism for such phenomena is discussed.
利用三联噻吩衍生物中的膦酸基团与伊毛缟石表面的铝醇基团之间的特异性表面相互作用,制备了三联噻吩与伊毛缟石组成的有机/无机纳米杂化材料。通过 FTIR、UV-vis 吸收、荧光光谱、TEM 观察、氮气吸附-脱附和 I-V 测量对新材料进行了研究。在伊毛缟石中添加膦酸衍生物的三噻吩引起了吸收光谱和光致发光光谱的一些变化,表明在伊毛缟石表面形成了H型聚集体。紫外可见光谱和氮气吸附-解吸数据的分析深入了解了三噻吩分子结构对伊缟石表面吸附和聚集行为的影响。此外,当伊毛缟石被吸电子三联噻吩化学吸附时,通过伊毛缟石薄膜观察到电流显着增强。相反,当供电子三噻吩化学吸附在伊毛缟石上时,电流减少。讨论了这种现象的可能机制。