Questions and Answers (4) View all
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Answer added in Low Temperature Physics8 Low Temperature Electrical transportHi Sameer . I could not find the Book suggested by you.
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Answer added in Low Temperature Physics7 Low temperature transport phenomenon.Hello Samatham On what type of materials you are working.... I am working on amorphous materials (condcuting polymers) at low temperature.
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Answer added in Low Temperature Physics8 Low Temperature Electrical transportI want to discuss on the role of acoustical phonons in electrical transport at low temperatures (below 77K).
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Question asked in Low Temperature Physics8 Low Temperature Electrical transportLow Temperature Electrical transport
Publications (3) View all
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Article: Chemical synthesis and low temperature electrical transport in polypyrrole doped with sodium bis(2-ethylhexyl) sulfosuccinate
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ABSTRACT: Polypyrrole (PPy) is polymerized by chemical oxidative polymerization in presence of anionic surfactant sodium bis (2-ethylhexyl) sulfosuccinate (DEHS) as the dopant. The electrical conductivity was optimized in terms of oxidant to monomer molar ratio and polymerization yield was measured for these reactions. We have used ammonium persulphate (APS) as the oxidant for polymerization in this series of experiments. The effect of concentration of oxidant on the electrical conductivity is examined. Chemical synthesis of polypyrrole is supported by FTIR spectrum. The electrical conductivity of doped and undoped polypyrrole has been measured in the temperature range of 10–300K and is found to increase with rise in temperature. Electrical conductivity of PPy was analyzed in the light of various charge transport models. Analysis of the electrical conductivity data reveals that in the temperature range 60–300K electrical transport is predominantly governed by power law behaviour given by Kivelson model. However in the low temperature range 10–60K electrical transport is dominated by the fluctuation assisted mechanism.Journal of Materials Science Materials in Electronics 04/2012; 22(2):136-142. · 1.08 Impact Factor -
Article: Hopping and Tunneling transport over a wide temperature range in chemically Synthesized doped and undoped Polypyrrole
Solid State Communications. 01/2010; 150:1766. -
Article: Synthesis and Electrical Characterization of Self-Supported Conducting Polypyrrole-Poly (vinylidene fluoride) Composite Films
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ABSTRACT: We report the synthesis of polypyrrole composite films by chemical oxidation polymerization of pyrrole dif-fused inside poly(vinylidene fluoride) matrix and temperature dependant dc conductivity study of these composite films. Ammonium persulfate is used as an oxidizing agent and HCl as the dopant in aqueous medium. This technique produces highly conductive, flexible and free standing polymer composite films in semi-interpenetrating architecture. It is observed that conductivity of the composite films can be controlled by varying the dopant concentration. The variation of conduc-tivity with temperature indicates the semiconducting nature of these composite films. The temperature dependence of conductivity is explained in the light of two different models from which activation energy (E a) and other hopping pa-rameters are determined. Experimental data fits well with variable range hopping model and three dimensional charge transport mechanism is shown to occur in these films.
