Please use this identifier to cite or link to this item: http://gukir.inflibnet.ac.in:8080/jspui/handle/123456789/4029
Title: Conduction mechanisms in polypyrrole-copper nanocomposites
Authors: Praveenkumar K
Sankarappa T
Ashwajeet J.S
Ramanna R
Sujatha T
Kattimani J
Chandraprabha G.
Keywords: Density of states
Polaron hopping
PPy-Cu nanocomposites
Structure
Issue Date: 2015
Publisher: Sumy State University
Citation: Journal of Nano- and Electronic Physics , Vol. 7 , 2 , p. 1 - 4
Abstract: By mixing independently synthesized polypyrole and copper nanoparticles in different proportions, nanocomposites were prepared. Bulk and surface structures were probed by X-ray diffraction and Scanning electron microscopes. DC resistivity with temperature as a variable of all the composites has been investigated. Conductivity has been calculated using resistivity and found it to be of the order 10-4 (?-1m -1), which is greater by one order of magnitude than that reported for polypyrole nanoparticles. Temperature behaviour of conductivity in all the samples revealed semiconducting nature. By applying Mott's theory of small polaron hopping, activation energy for conductivity at high temperature has been determined. Activation energy is found to be increasing with increase in copper content in the composites. Using data deviated from small polaron model, the density of states at Fermi level is calculated by employing the theory of variable range hopping of polarons due to Mott. It is for the first time that PPy-Cu nanocomposites have been probed for structural and temperature dependence of conductivity and conduction mechanisms operated in these composites in different temperature regions have been understood. © 2015 Sumy State University.
URI: http://gukir.inflibnet.ac.in:8080/jspui/handle/123456789/4029
Appears in Collections:1. Journal Articles

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