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Title: Mechanism of direct current electrical charge conduction in p-toluenesulfonate doped polypyrrole/carbon composites

Polypyrrole/carbon (PPy/C) composites have been synthesized using varying concentration of p-toluenesulfonate (pTS) dopant by surface initiated in-situ chemical oxidative polymerization. The synthesis and influence of pTS on the structure of the PPy/C composites are confirmed by Fourier transform infrared studies and the morphological features have been examined by scanning electron microscopy. X-ray photoelectron spectroscopy, employed to examine the surface composition and doping level of these composites, confirms the anionic doping into the polymer backbone. Electron spin resonance measurement has been carried out on these samples to identify the nature of the charge carriers and their concentration at different doping levels. The dc electrical conductivity of these composites has been measured in the temperature range ∼10–305 K. The observed results have been analyzed in the framework of existing theoretical models. Different Mott's parameters, such as characteristic temperature (T{sub 0}), density of states at the Fermi level (N(E{sub F})), average hopping distance (R), and average hopping energy (W), evaluated from dc conductivity data supports the applicability of Mott's three dimensional variable range hopping mechanism in this system.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [3]
  1. National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S. Krishnan Marg, New Delhi 110012 (India)
  2. (India)
  3. Department of Chemistry, Banaras Hindu University, Varanasi 221005 (India)
Publication Date:
OSTI Identifier:
22277916
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; CARBON; CHARGE CARRIERS; COMPOSITE MATERIALS; CONCENTRATION RATIO; DIRECT CURRENT; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; ELECTRON SPIN RESONANCE; FERMI LEVEL; FOURIER TRANSFORMATION; ORGANIC POLYMERS; OXIDATION; POLYMERIZATION; SCANNING ELECTRON MICROSCOPY; TEMPERATURE DEPENDENCE; X-RAY PHOTOELECTRON SPECTROSCOPY