National Changhua University of Education Institutional Repository : Item 987654321/14152

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NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/14152

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/14152

Title:	Thermoelectric Power and Conductivity of Different Types of Polypyrrole
Authors:	KEMP, N. T.;KAISER, A. B.;Liu, Chia-Jyi;CHAPMAN, B.;MERCIER, O.;CARR, A. M.;TRODAHL, H. J.;BUCKLEY, R. G.;PARTRIDGE, A. C.;LEE, J. Y.;KIM, C. Y.;BARTL, A.;DUNSCH, L.;SMITH, W. T.;SHAPIRO, J. S.
Contributors:	物理學系
Keywords:	Polypyrrole;Thermoelectric power;Conductivity;Gas sensors
Date:	1999-05
Issue Date:	2012-09-10T06:13:22Z
Publisher:	John Wiley & Sons, Inc.
Abstract:	We have measured the thermoelectric power and conductivity as a function of temperature of a wide range of polypyrrole samples, including a film of soluble polypyrrole synthesized chemically, and wrinkled films synthesized using indium–tin oxide electrodes; other samples investigated include high-conductivity polypyrrole films synthesized at different temperatures and current densities, films grown on nonconducting substrates, and polypyrrole gas sensors. The thermoelectric powers are remarkably similar and metal-like for the medium and high conductivity samples but show nonzero extrapolations to zero temperature for wrinkled samples. The temperature dependence of conductivity tends to be greater for samples of lower conductivity. In contrast to polyaniline and polyacetylene, a crossover to metallic sign for the temperature dependence of conductivity at higher temperatures is not observed in any of our samples; the fluctuation-induced tunnelling and variable-range hopping expressions account for nearly all our conductivity data except for low-temperature anomalies.
Relation:	J. Polym. Sci. B: Polm. Phys., 37(9): 953-960
Appears in Collections:	[Department of Physics] Periodical Articles

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