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Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite

The polymers/semiconductor nanoparticle composites were prepared from 60 g of polyvinyl alcohol (PVA), 12 g of aniline hydrochloride and different cadmium nitrate concentrations of 0.0462, 0.0924, 0.1386 and 0.186 g and different sulphur thiosulfate concentrations of 0.0372, 0.0744, 0.1116 and 0.15...

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主要作者: Kharazmi, Alireza
格式: Thesis
出版: 2013
在线阅读:http://psasir.upm.edu.my/id/eprint/38841/
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spelling my.upm.eprints.388412016-04-06T05:14:03Z http://psasir.upm.edu.my/id/eprint/38841/ Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite Kharazmi, Alireza The polymers/semiconductor nanoparticle composites were prepared from 60 g of polyvinyl alcohol (PVA), 12 g of aniline hydrochloride and different cadmium nitrate concentrations of 0.0462, 0.0924, 0.1386 and 0.186 g and different sulphur thiosulfate concentrations of 0.0372, 0.0744, 0.1116 and 0.15 g respectively in 600- ml deionized water at ambient condition. The aqueous composites were dried several days in a dark room to prepare for composite films which then undergone gamma irradiation with doses up to 50 kGy of Co-60 gamma-rays source at a constant dose rate. As a result, aniline monomers were converted to polyaniline (PANI) and cadmium and sulfur ions were converted to cadmium sulfide (CdS) owing to radiation oxidation and reduction processes respectively. The composites have been transformed into PVA/PANI/CdS nanocomposites and their structural, morphological, optical and electrical properties were characterized by using XRD, FESEM, UV-visible spectroscopy and impedance analyzer, respectively. The formation of crystalline growth of CdS nanoparticles was confirmed by sharp XRD peaks in the 2 range of 10° to 30° which possessed orthorhombic structure with crystal lattice parameter a= 7 Ǻ, b=7.9 Ǻ, c= 10.4 Ǻ and V=567 Ǻ 3 . While, the formation of PVA/PANI composites was confirmed by broad XRD peaks and branch shape FESEM images. The optical absorption spectra of PVA/PANI/CdS nanocomposites revealed characteristic peaks at 316 and 375 nm due to Cl powder and CdS nanoparticles, respectively; and a shoulder at 575 nm due to PANI. The band gap energy decreased from 1.85 eV to 1.65 eV for PANI and increased from 2.55 to 2.70 eV for CdS nanoparticles as the doses increased from 0 to 50 kGy. The dc conductivity of the PVA/PANI/CdS nanocomposites increased from about 4.4x10-7 to 2.4x10-4 S/m owing the creation of polarons in the PANI covalent structure as the doses increased from 0 to 50 kGy. 2013-06 Thesis NonPeerReviewed Kharazmi, Alireza (2013) Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite. Masters thesis, Universiti Putra Malaysia.
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
description The polymers/semiconductor nanoparticle composites were prepared from 60 g of polyvinyl alcohol (PVA), 12 g of aniline hydrochloride and different cadmium nitrate concentrations of 0.0462, 0.0924, 0.1386 and 0.186 g and different sulphur thiosulfate concentrations of 0.0372, 0.0744, 0.1116 and 0.15 g respectively in 600- ml deionized water at ambient condition. The aqueous composites were dried several days in a dark room to prepare for composite films which then undergone gamma irradiation with doses up to 50 kGy of Co-60 gamma-rays source at a constant dose rate. As a result, aniline monomers were converted to polyaniline (PANI) and cadmium and sulfur ions were converted to cadmium sulfide (CdS) owing to radiation oxidation and reduction processes respectively. The composites have been transformed into PVA/PANI/CdS nanocomposites and their structural, morphological, optical and electrical properties were characterized by using XRD, FESEM, UV-visible spectroscopy and impedance analyzer, respectively. The formation of crystalline growth of CdS nanoparticles was confirmed by sharp XRD peaks in the 2 range of 10° to 30° which possessed orthorhombic structure with crystal lattice parameter a= 7 Ǻ, b=7.9 Ǻ, c= 10.4 Ǻ and V=567 Ǻ 3 . While, the formation of PVA/PANI composites was confirmed by broad XRD peaks and branch shape FESEM images. The optical absorption spectra of PVA/PANI/CdS nanocomposites revealed characteristic peaks at 316 and 375 nm due to Cl powder and CdS nanoparticles, respectively; and a shoulder at 575 nm due to PANI. The band gap energy decreased from 1.85 eV to 1.65 eV for PANI and increased from 2.55 to 2.70 eV for CdS nanoparticles as the doses increased from 0 to 50 kGy. The dc conductivity of the PVA/PANI/CdS nanocomposites increased from about 4.4x10-7 to 2.4x10-4 S/m owing the creation of polarons in the PANI covalent structure as the doses increased from 0 to 50 kGy.
format Thesis
author Kharazmi, Alireza
spellingShingle Kharazmi, Alireza
Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite
author_facet Kharazmi, Alireza
author_sort Kharazmi, Alireza
title Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite
title_short Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite
title_full Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite
title_fullStr Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite
title_full_unstemmed Gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/CdS nanocomposite
title_sort gamma radiation induced synthesis and characterization of polyvinyl alcohol/polyaniline/cds nanocomposite
publishDate 2013
url http://psasir.upm.edu.my/id/eprint/38841/
_version_ 1643832251665874944
score 13.251813

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