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Dielectric and conduction properties of pure polyimide films
Author(s) -
Muruganand S,
Narayandass Sa K,
Mangalaraj D,
Vijayan T M
Publication year - 2001
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.749
Subject(s) - polyimide , materials science , thermal conduction , dielectric , amorphous solid , capacitor , isothermal process , composite material , poole–frenkel effect , capacitance , film capacitor , vacuum evaporation , electrode , voltage , thin film , electrical engineering , optoelectronics , nanotechnology , chemistry , thermodynamics , physics , organic chemistry , engineering , layer (electronics)
Abstract Capacitors with an Al–polyimide–Al sandwich film structure have been fabricated: the top and the bottom aluminium electrodes were deposited by vacuum evaporation and the polyimide film was deposited by an isothermal immersion method. An X‐ray diffractogram of the film indicates the amorphous nature of the polyimide film. Dielectric and ac conduction properties of polyimide capacitors in the frequency range 10 kHz to 10 MHz at various temperatures (303–423 K) are reported; the dc conduction at different voltages and at various temperatures (303–423 K) is given. The capacitance of the film decreases with increasing frequency but increases with increasing temperature. The ac conduction studies suggest that electron hopping is responsible for conduction while the dc conduction studies reveal that Poole–Frenkel conduction is predominant at high fields. The activation and zero field activation energies are also calculated. © 2001 Society of Chemical Industry