STRUCTURE, DIELECTRIC, AC AND DC CONDUCTION PROPERTIES OF ACID DOPED POLYANILINE FILMS

Capacitors with Al-pani (CH3SO3H)-Al sandwich film structure were fabr icated. The top and bottom aluminium electrodes were deposited by vacu um evaporation and the pani (CH3SO3H) film deposited by a solution cas ting method. An X-ray diffractogram indicates the amorphous nature of the polymer films. The thicknesses of the films were measured by capac itance, weighing and Rutherford back scattering (RBS) methods. Anneali ng, dielectric and AC conduction properties were studied in the freque ncy range 10 kHz-10 MHz for various temperatures (303-423 K). DC condu ction studies were made for these films in the temperature range 303-4 43 K. The capacitance of the film decreases with increasing frequency. AC conduction studies suggest that hopping of polarons are responsibl e for conduction. DC conduction studies reveal that the Poole-Frenkel type of conduction is predominant at high fields. (C) 1997 Elsevier Sc ience Ltd.