导电聚苯胺/TiO_2微/纳米球的制备及其结构表征

PREPARATION AND CHARACTERIZATION OF CONDUCTIVE POLYANILINE /TiO_2 COMPOSITES

采用具有八面体形貌的氧化亚铜为模板,制备了聚苯胺/TiO2(PANI/TiO2)微/纳米球,TiO2纳米粒子很均匀地分散在聚苯胺中.研究了不同TiO2/苯胺(TiO2/ANI)摩尔比对PANI/TiO2复合物的结构、形貌和电学性能的影响.实验结果表明,随着TiO2/ANI摩尔比的增加,PANI/TiO2复合物的直径逐渐减小,当TiO2/ANI摩尔比为0.16时,复合物的平均直径为373nm,而当TiO2/ANI摩尔比增加到1.6时,复合物的平均直径降到80nm.PANI/TiO2复合微/纳米球的电导率随着TiO2/ANI摩尔比的增加先升高后降低,当TiO2/ANI摩尔比达到1.6时,电导率由10-4S/cm提高到100S/cm,达到最大值.产物的形貌和结构分别采用扫描电镜、透射电镜、红外吸收光谱和X-射线衍射等手段进行了表征.

PANI /TiO2 micro /nano spheres were prepared successfully by using octahedral cuprous oxide as the template. And TiO2 nano-particles are uniformly dispersed in polyaniline. Compared with the common template reported,Cu2O crystal is not only a new type of template in shape and quality,but also omits the need for post-treatment due to the soluble Cu2 ＋ formed by the reaction of Cu2O with the oxidant during the polymerization process. The molar ratio of TiO2 /ANI played an important role in controlling in morphology, electrical properties and the chemical structure of PANI /TiO2 composites. The results showed that the average diameters of PANI /TiO2 composites became smaller and smaller with the TiO2 /ANI molar ratio increasing. The average diameters decreased from 373 nm to 80 nm when TiO2 /ANI molar ratio increased from 0. 16 to 1. 6. The room-temperature conductivity of PANI /TiO2 composites increased from 10 -4 S /cm to 100 S /cm when TiO2 /ANI molar ratio changed from 0. 16 to 1. 6,and then decreased softly when TiO2 /ANI molar ratio was beyond 1. 6. It is because that the oxidation state and protonation state of the PANI were affected by the TiO2 / ANI molar ratio. The morphologies and chemical structures of the PANI /TiO2 composites were characterized by using scanning electron microscopy,transmission electron microscopy,infrared absorption spectroscopy and X-ray diffraction.