Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/13301
Title: Temperature dependent studies of electric and dielectric properties of polythiophene based nano composite
Authors: Tiwari, D C
Sen, Vikas
Sharma, Rishi
Keywords: Dielectric constant
Carbon nanotubes
Polythiophene
<i><span style="font-size:10.0pt;font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Mangal; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:HI">ac</span></i><span style="font-size:10.0pt;font-family:"Times New Roman","serif";mso-fareast-font-family: "Times New Roman";mso-bidi-font-family:Mangal;mso-ansi-language:EN-US; mso-fareast-language:EN-US;mso-bidi-language:HI"> conductivity</span>
Relaxation time
Issue Date: Jan-2012
Publisher: NISCAIR-CSIR, India
Abstract: The fabrication, characterization, electric, dielectric and <i>ac</i> conductivity measurement of polythiophene and carbon nanotube (CNT) composite are described. The polythiophene (PTh) and polythiophene/ multiwalled carbon nanotube (PTh/MWCNT) composite are prepared chemically by oxidative polymerization of thiophene(Th). The formation of PTh and incorporation of CNTs into PTh are confirmed by Fourier Transform – Infrared spectroscopy (FT-IR) and Energy Dispersive X-Ray analysis (EDAX) analysis. Scanning Electron Microscopic (SEM) analysis revealed the formation of polymer/CNT composite. SEM image of PTh shows a leaf like structure and image of PTh/MWCNT shows the incorporation of MWCNT into the PTh flakes. Atomic force microscopic (AFM) analysis shows the morphology of PTH and PTh/MWCNT. The structural features of Nanotube-Polymer association are observed by AFM studies. The electrical behaviour of prepared samples has been studied by measuring <i>I-V</i> characteristics at varying temperature. The dielectric properties of these samples have been studied at low frequencies (150-700 kHz) for varying temperature. The dielectric constant for PTh/MWCNT is found to be higher than PTh for all temperature ranges. Finally,the<i>ac </i>electrical conductivity (σ<sub>ac</sub>) and dielectric relaxation time calculations have been carried out by using the data available from dielectric measurements and by employing a simple relationship. Conductivity shows a linear dependence on temperature and is also higher for PTh/MWCNT.
Description: 49-56
URI: http://hdl.handle.net/123456789/13301
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.50(01) [January 2012]

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