溴掺杂聚苯胺的导电性能及机理研究

Conducting Properties and Mechanism of Polyaniline Doped by Bromine

通过化学氧化法制备聚苯胺,对其进行溴和氢溴酸掺杂,聚苯胺(PANI)的电导率比掺杂前提高了11-13个数量级。采用红外光谱、热重分析、紫外可见光谱和X射线光电子能谱分析研究了溴和氢溴酸对PANI的掺杂作用,探讨了掺杂PANI的导电机理。研究表明,不同于氢溴酸对PANI的质子酸掺杂,溴掺杂过程中产生的溴负离子增加了PANI的载流子浓度并形成电子转移复合物,提高了聚苯胺的电导率。

Polyaniline（PANI） was synthesised by chemical oxidation method,then doped by bromine vapor and hydrobromic acid,the conductivity of PANI was increased by 11-13 orders of magnitude after doping.FTIR,TGA,UV-Vis and XPS spectra were used to characterize the interaction between dopants and PANI and studied the conducting mechanism of Br doped PANI.The experiments showed that it was different from protonic acid doping as HBr,bromine anions and charge transfer complex formed in the doping process enhanced the charge carrier concentration then promote the conductivity of PANI.