Electrical Conductivity of Doped Polyacrylonitrile (PAN) (Halogen Doped Polyacrylonitrile).

摘要

The electrical conductivity and optical absorption spectra of halogen doped PAN have been investigated. When films of PAN previously heated in vacuum to 280 exp 0 C are exposed to bromine or iodine vapor the conductivity rises suddenly. The conductivity is reduced by pumping off the vapor, but upon subsequent reheating the conductivity increases dramatically, with a transition occurring at about 270 exp 0 C. Undoped samples were previously reported to undergo a similar transition above 390 exp 0 C. All samples obey sigma alpha T/sup -1/4/ behavior, suggesting 3-dimensional variable range hopping as the conduction mechanism. The optical and infrared absorption spectra of doped PAN are compared to those previously reported for the undoped material. The stability of doped PAN in air is also discussed. 7 figures. (ERA citation 08:034013)