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Electron Spin Resonanance Studies of Acid‐Doped Polyaniline
Author(s) -
Yang SzeMing,
Chien ShuHua
Publication year - 1986
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198600041
Subject(s) - chemistry , electron paramagnetic resonance , polyaniline , doping , conductivity , spin density , laser linewidth , electrical resistivity and conductivity , analytical chemistry (journal) , nuclear magnetic resonance , inorganic chemistry , polymer , organic chemistry , condensed matter physics , polymerization , laser , physics , electrical engineering , engineering , optics
The electron spin resonance spectra of various acid‐doped polyanilines were studied. There are three significant changes in the ESR spectra upon acid‐doping as the acid concentration of the doping solution is varied from p H<3 to p H>1: (1) The linewidth decreases by a factor of three. (2) The intensity increases. (3) The spin density increases by a factor of twenty. By comparing the variation of the electric conductivity with the variation of the spin density upon acid‐doping, it is proposed that the polyaniline prepared by chemical oxidation consists of various oxidized and reduced units, and that the pi‐electron rearrangement upon acid‐doping results in highly conductive radical cations.