Conducting Properties and Mechanism of Polyaniline Doped by Bromine

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.