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Electrical resistivity and magnetoresistivity of protonic acid (h 2 SO 4 and HCl)‐doped polyaniline at low temperature
Author(s) -
Ghosh M.,
Barman A.,
Meikap A. K.,
De S. K.,
Chatterjee S.,
Chattopadhyay S. K.
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000321)75:12<1480::aid-app6>3.0.co;2-9
Subject(s) - polyaniline , electrical resistivity and conductivity , variable range hopping , doping , materials science , atmospheric temperature range , magnetoresistance , aqueous solution , analytical chemistry (journal) , condensed matter physics , thermal conduction , chemistry , magnetic field , composite material , thermodynamics , polymer , physics , organic chemistry , polymerization , optoelectronics , quantum mechanics
Electrical‐transport properties of protonic acid (H 2 SO 4 and HCl)‐doped polyaniline (PANI) in an aqueous ethanol medium were investigated in the temperature range 1.8 K ≤ T ≤ 300 K and in a magnetic field up to 8 T. The room‐temperature resistivity of HCl‐doped PANI is larger than that of H 2 SO 4 ‐doped PANI. The resistivity ratios ρ r = ρ(1.8 K)/ρ(300 K) of the samples are high. The samples in the insulating region show a crossover from a Mott to an Efros–Shklovskii variable range hopping conduction at T = 9.8 K for H 2 SO 4 ‐doped PANI and 8.5 K for HCl‐doped PANI. The magnetoresistivity of these samples is also explained by the variable range hopping theory. The different physical parameters were calculated from the experimental data. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 1480–1486, 2000