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Investigation of Structure and Electrical Conductivity in Doped Polyaniline
Author(s) -
Chaudhari H. K.,
Kelkar D. S.
Publication year - 1997
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/(sici)1097-0126(199704)42:4<380::aid-pi727>3.0.co;2-f
Subject(s) - polyaniline , materials science , electrical resistivity and conductivity , doping , conductivity , conductive polymer , composite material , polymer , optoelectronics , chemistry , electrical engineering , engineering , polymerization
Polyaniline (PAn) was synthesized chemically and doped with various dopants, such as HCl, HCOOH, I 2 and methylene blue (C 16 H 18 ClN 3 S), by an immersion method. The structure of these samples was investigated by infrared (IR) spectroscopy and wide‐angle X‐ray diffraction (WAXD) analysis. Remarkable changes have been observed in the IR spectra of doped PAn, indicating that doping is affecting the chemical structure. The percentage crystallinity was also found to increase after doping. The electrical conductivity (σ) of these samples was measured at various temperatures ( T =308K to 423K). Plots of log σ versus T y , where y =‐1/2, ‐1/3, ‐1/4, were obtained and used to identity the conduction mechanism. Undoped PAn shows semiconducting behaviour, while doped samples show a variable range hopping mechanism. A primary cell was constructed with HCl‐doped PAn as one of the electrodes and a copper plate as the other electrode. It gave an open circuit voltage of 0·38V and a short circuit current of about 5·4mA. © of SCI.