Electrical conductivity of multi-walled carbon nanotubes doped conducting polythiophene
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2014, Vol 2, Issue 11
Abstract
To improve the functions of conducting polymers, the fabrication of multifunctional conducting polymer Nano composites has attracted a great deal of attention with the advent of carbon nanotubes (CNTs). Addition of CNTs in the matrix of conducting polymers changes their behaviour mostly towards the electrical conductivity. In this paper we report the influence of functionalized multi-walled carbon nanotubes (MWCNTs) on conductive properties of conducting polymer polythiophene (PTH). Nano composites based on multi-walled carbon nanotubes were synthesized by in-situ oxidative polymerization of thiophene monomer in the presence of functionalized CNTs. These Nano composites have been characterized by UV-VIS, FTIR, XRD and SEM to study the effect of incorporation of MWCNTs on the morphology, structure and crystalline of the conducting polythiophene. Addition of functionalized CNTs to the polymer matrix helps the polymer material to settle down on the walls of CNTs. The interaction between the quinoid ring of PTH and the MWCNT causes PTH chains to be adsorbed at the surface of MWCNT, thus forming a tubular core surrounding the MWCNT. Nano composites show high electrical conductivity compared to pure PTH. The enhancement in conductivity of the Nano composites is due to the charge transfer effect from the quinoid rings of the PTH to the MWCNT. The effect of MWCNT on the transport parameters of PTH was also studied. By comparing the transport parameters of PTH and PTH-CNT Nano composites, charge localization length ( ) and most probable hopping distance (R) were found to be decreased with high wt % of CNT in PTH-CNT Nano composites, whereas the charge hopping energy (w) was found to be increased. These results show that the addition of CNT in PTH matrix, improved the electrical properties of PTH and such Nano composites are most suitable advanced materials for electronic devices.
Authors and Affiliations
Milind D. Deshpande, Subhash B. Kondawar
Keywords
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