Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method

Electrically conducting polythiophene (PTh) was prepared from 2-thiopheneacetyl chloride at different concentrations of 9.1, 16.7, 23.1, 28.6 and 33.3 wt% dispersed in polyvinyl alcohol (PVA) films. The sample films were irradiated in a γ-ray chamber at different doses of 0, 10, 20, 30, 40 and 50 k...

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Main Author:	A. Dandi, Aiman Moftah
Format:	Thesis
Language:	English
Published:	2012
Subjects:	Polythiophenes - Electric properties Polythiophenes - Optical properties Polyvinyl alcohol
Online Access:	http://psasir.upm.edu.my/id/eprint/31935/1/FS%202012%2036R.pdf
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spelling	my-upm-ir.319352015-02-02T00:57:17Z Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method 2012-09 A. Dandi, Aiman Moftah Electrically conducting polythiophene (PTh) was prepared from 2-thiopheneacetyl chloride at different concentrations of 9.1, 16.7, 23.1, 28.6 and 33.3 wt% dispersed in polyvinyl alcohol (PVA) films. The sample films were irradiated in a γ-ray chamber at different doses of 0, 10, 20, 30, 40 and 50 kGy at ambient conditions. Upon gamma irradiation, the 2-thiopheneacetyl chloride monomer polymerized into conducting PTh by loosing H+ ions and formed conducting species of polarons. The SEM morphology of PTh/PVA composite of optimum 2-thiopheneacetyl chloride concentration and absorbed dose of 28.6 wt% and 30 kGy respectively, shows a good morphology with spherical size, 0.7 μm in diameter and spreaded uniformly in the PVA matrix. The UV-visible absorption peak of this PTh composite red-shifted to 400 nm and the intensity increases with increase of concentration and dose until the optimum values. The optical band gap energy Eg decreases with an increase of monomer concentration and absorbed dose. For examples, Eg decreased from 3.38 eV at 0 kGy to 3.19 eV at 30 kGy for 9.1 wt% and from 2.35 eV at 0 kGy to 2.15 eV at 30 kGy for 28.6 wt%. The impedance analyzer was used to determine the electrical conductivity and found that the conductivity increased with increase of monomer concentration and absorbed dose until they reached the optimum amounts. The direct current dc component is the major conductivity due to the formation of polarons in the PTh chain structure. For examples, the dc conductivity increased from 5.2×10-7 S/m at 0 kGy to 2.6×10-5 S/m at 30 kGy for 9.1 wt% and from 2.8×10-4 S/m at 0 kGy to 9.8×10-4 S/m at 30 kGy for 28.6 wt%. Polythiophenes - Electric properties Polythiophenes - Optical properties Polyvinyl alcohol 2012-09 Thesis http://psasir.upm.edu.my/id/eprint/31935/ http://psasir.upm.edu.my/id/eprint/31935/1/FS%202012%2036R.pdf application/pdf en public masters Universiti Putra Malaysia Polythiophenes - Electric properties Polythiophenes - Optical properties Polyvinyl alcohol Faculty of Science
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Polythiophenes - Electric properties Polythiophenes - Optical properties Polyvinyl alcohol
spellingShingle	Polythiophenes - Electric properties Polythiophenes - Optical properties Polyvinyl alcohol A. Dandi, Aiman Moftah Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method
description	Electrically conducting polythiophene (PTh) was prepared from 2-thiopheneacetyl chloride at different concentrations of 9.1, 16.7, 23.1, 28.6 and 33.3 wt% dispersed in polyvinyl alcohol (PVA) films. The sample films were irradiated in a γ-ray chamber at different doses of 0, 10, 20, 30, 40 and 50 kGy at ambient conditions. Upon gamma irradiation, the 2-thiopheneacetyl chloride monomer polymerized into conducting PTh by loosing H+ ions and formed conducting species of polarons. The SEM morphology of PTh/PVA composite of optimum 2-thiopheneacetyl chloride concentration and absorbed dose of 28.6 wt% and 30 kGy respectively, shows a good morphology with spherical size, 0.7 μm in diameter and spreaded uniformly in the PVA matrix. The UV-visible absorption peak of this PTh composite red-shifted to 400 nm and the intensity increases with increase of concentration and dose until the optimum values. The optical band gap energy Eg decreases with an increase of monomer concentration and absorbed dose. For examples, Eg decreased from 3.38 eV at 0 kGy to 3.19 eV at 30 kGy for 9.1 wt% and from 2.35 eV at 0 kGy to 2.15 eV at 30 kGy for 28.6 wt%. The impedance analyzer was used to determine the electrical conductivity and found that the conductivity increased with increase of monomer concentration and absorbed dose until they reached the optimum amounts. The direct current dc component is the major conductivity due to the formation of polarons in the PTh chain structure. For examples, the dc conductivity increased from 5.2×10-7 S/m at 0 kGy to 2.6×10-5 S/m at 30 kGy for 9.1 wt% and from 2.8×10-4 S/m at 0 kGy to 9.8×10-4 S/m at 30 kGy for 28.6 wt%.
format	Thesis
qualification_level	Master's degree
author	A. Dandi, Aiman Moftah
author_facet	A. Dandi, Aiman Moftah
author_sort	A. Dandi, Aiman Moftah
title	Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method
title_short	Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method
title_full	Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method
title_fullStr	Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method
title_full_unstemmed	Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method
title_sort	optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science
publishDate	2012
url	http://psasir.upm.edu.my/id/eprint/31935/1/FS%202012%2036R.pdf
_version_	1747811635860340736

Optical and electrical properties of conducting polythiophene/polyvinyl alcohol composites synthesized by gamma-ray irradiation method

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