Through absorption of bromine vapor, the electrical conductivity of poly(phenylacetylene) (PPA) was enhanced by 1012 times. UV-Vis spectra, and XPS spectra were used to study the p-π conjugation and the conducting mechanism in bromine doped PPA. The experiment indicated that the bromine anion and charge transfer complex (CTC) formed in bromine doped PPA could promote the conductivity. The experiment illuminates that increase of the pressure can promote the conjugation between PPA and bromine and the increase of the temperature leads to the decrease of the p-π conjugated formation in PPA to reduce the conductivity.

Key words: bromine, poly(phenylacetylene), p-π conjugation, conducting mechanism, pressure, temperature