聚苯胺-金复合材料的成膜动力学

Kinetics of Polyaniline-Gold Composite Film Formation

采用原位聚合方法,以氯金酸(HAuCl4)为氧化剂,苯胺(ANI)为还原剂,制备聚苯胺-金复合材料膜。用扫描电镜(SEM)表征了复合膜的形貌;并用石英晶体微天平(QCM)实时监测该复合材料的成膜过程,研究了其成膜动力学。结果表明,金粒子的平均粒径为400nm,较均匀地分布在复合膜中;复合膜的增长速率随氯金酸浓度、苯胺浓度和反应温度的升高而增大,得到成膜反应对氧化剂为0.5级,对苯胺为1.5级,并由增长速率与温度的关系计算出成膜过程的活化能为(40.32±0.15)kJ/mol。

The polyaniline-gold （PANI-Au） composite film was prepared using HAuCl4 as oxidant and aniline （ANI） as reduction agent by in-situ polymerization. The morphology of composite film was characterized by scanning electron microscopy （SEM）,and the formation of composite film was monitored by quartz crystal microbalance （QCM）. The kinetics of the film formation was investigated by QCM technique. The results indicate that the gold particles uniformly disperse in the composite film. The composite film growth rate increases with the rise of HAuCl4,ANI and reaction temperature. The reaction exhibits half-order with respect to HAuCl4 and 1.5-order to aniline,and the activation energy calculated from the temperature dependence of the growth rate is （40.32±0.15） kJ/mol.