Doping of 2-Cl-PANI/PVC films by exposure to UV, #gamma#-rays and e-beams

摘要

2-Chloro-polyaniline (2-Cl-PANI) is chemicallyprepared in its non-conducting (Emeraldine Base, EB) form anddissolved together with polyvinylchloride (PVC) in THF forcastin into thin (10-50#mu#m) composite films. The electricalconductivity of these films increases by more than four orders ofmagnitude (from 10~(-6) to 10~(-2) S/cm) when they areexposed to UV, #gamma#-rays and e-beams. This is attributed tothe dehydrochlorination (loss of HCl) of PVC by exposure toenergetic particles and subsequent doping of the 2-Cl-PANIfurther exposure to NH_3 vapours. The UV (or other particles)-induced doping/NH_3 undoping cycles can be repeated severaltimes until almost total dehydrochlorination of the PVC matrix.UV-Vis NIR, Fourier transform infrared (FTIR) and X-rayphotoelectron spectroscopic (XPS) techniques are employed tofollow the changes in the composite films upon doping byexposure to these energetic particles.