Correlation between electron spin resonance and dc conductivity data of polypyrrole, poly(N-methyl pyrrole-pyrrole), and poly(N-methyl pyrrole)

Abstract

Alternate and direct current conductivity of conducting polyaniline dispersed with poly vinyl alcohol and blended with methyl cellulose

Mechanism of charge transport in poly(2,5-dimethoxyaniline)

“…It can be seen from Table II that the density of states at the Fermi level; N͑E F ͒ of all the PDMA samples lies in the range ϳ10 17 -10 18 cm −3 eV −1 which is in good agreement with the values reported earlier for other conjugated polymers. 6,10,[13][14][15][16][17][18][19] Our results are consistent with the Mott's requirement that ␣R ӷ 1 and W ӷ k B T for conductivity by hopping to distant sites ͑Table II͒. The temperature dependent activation energy ͓Fig.…”

“…It seems worthwhile to mention here that Mott's VRH model 12 has been extensively applied to amorphous inorganic semiconductors over the last four decades with varying degree of success in polypyrrole, poly͑3-decylpyrrole͒, polythiophene, poly͑3-methylthiophene͒, poly͑3-hexylthiophene͒, poly͑3-octylthiophene͒, emeraldine form of PANI. [6][7][8][9][10][11][13][14][15][16][17][18][19][20] The VRH mechanism is also reported 21 in poly͑o-methoxyaniline͒ in the small temperature range 298-398 K. However, no report is available in literature on the temperature dependence of dc electrical conductivity of PDMA. The present paper is a report of our measurements of dc electrical conductivity in the wide temperature range 6-303 K on various samples of PDMA.…”

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

“…However, when the carrier localization is not strong, the charge carriers jump to the sites for which the required activation energy is small and resides farther away, then the charge transport occurs by VRH. 13,23 It is worthwhile to mention here that the Mott's VRH conduction model has been applied to explain the dc conductivity of many conjugated polymeric systems such as doped polyacetylene, 25,26 polyanilines, 27,28 poly(2,5-dimethoxyaniline), 17 polypyrroles, 18,[21][22][23]33 poly(3-methylthiophene), [29][30][31]34 poly(3-hexylthiophene), 19 and poly(3-octylthiophene), 20,32 carbon-black/polypyrrole nanocomposites. 35 Several studies on dc conduction of different conducting polymers and their composite systems are available in literature.…”

“…35 Several studies on dc conduction of different conducting polymers and their composite systems are available in literature. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] However, there is no report available on temperature dependence of dc electrical conductivity in pTS doped PPy/C composites.…”

“…15 The other two models, widely used to explain the dc conductivity of conjugated polymeric systems, are fluctuation induced tunneling (FIT) 16 and Mott's variable range hopping (VRH) conduction. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] In FIT conduction model, 16 the tiny conducting domains, formed during doping in a granular system, participates in the delocalization of charge carriers by tunneling between conducting metallic islands. However, the macroscopic conductivity in most of the conjugated polymeric systems is assumed to result from the hopping conduction process.…”