反胶束软模板法合成PANI/TiO_2纳米棒复合材料及其性能研究

Synthesis of PANI/TiO_2 Nanorods Composites by Reverse Micelle Template and Their Properties

以阳离子表面活性剂十六烷基三甲基溴化胺（CTAB）形成的反胶束为模板，制备了一系列不同纳米TiO2含量的PANI／TiO2纳米复合材料。利用FTIR，UV-Vis，TG，TEM和荧光光谱等方法对产物进行了结构表征和性能研究。探讨了反胶束体系中pANI／TiO2复合纳米棒形成的自组装机理。结果表明：复合材料主要为直径30~40nm，长约400nnl的PANI／TiO2复合纳米棒，二氧化钛纳米粒子与聚苯胺大分子之间存在强的相互作用，并对复合材料的热稳定性起到提高作用，PANI／TiO2纳米复合材料在紫外和可见光区域均有吸收，并在416nm处激发产生荧光，荧光强度随着掺杂TiO2含量的提高得到了较大的增强。通过PANI／TiO2纳米棒复合材料中的激子离化和电荷传输过程探讨了PANI／TiO2的荧光量子效率和荧光强度增加的机理。

PANI/TiO2 nano-composites with different amount of nanometer TiO2 were synthesized by using reverse micelle formed from cationic surfactant cetyltrimethyl ammonium bromide （CTAB） as the template. The structure and properties of PANI/TiO2 nano-composites were investigated by FTIR, UV-Vis, TG, TEM and photoluminescence spectroscopy. The self-assembly mechanism of PANI/TiO2 nanorods composites in reversed micelle was discussed briefly. The results indicate that the synthesized nano-composites are PANI/TiO2 nanorods with an average diameter and length around 30-40 nm and 400 nm respectively. The infrared spectrum shows that a strong interaction exists between PANI and TiO2 nano-particles. The thermal stability of PANI/TiO2 nanorods improves with the contents of TiCh increasing. The absorption of PANI/TiO2 nano-composites was found to be very intense in the range of violet and visible light by UV-Vis spectrum. The fluorescence of PANI/TiO2 nanorods was excited at 416 nm, and the intensity of fluorescence was strengthened greatly with increasing TiO2 concentratiorL The mechanism of the strengthened fluorescence quantum efficiency and fluorescence intensity of PANI/TiO2 was investigated through the charge transfer and exciton dissociation in PANI/TiO2 nanorods composites.