Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites

Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites

Semiconductor/polymer nanocomposites are of increasing importance with their tunable properties being used as dielectric materials. This thesis focused on cadmium sulfide (CdS)/polymer nanocomposites. CdS has been combined with three polymer matrices, i.e. poly(styrene-divinylbenzene) [P(S-DVB)], po...

Full description

Saved in:
Bibliographic Details
Main Author: Rismana, Eriawan
Format: Thesis
Language:English
Published: 2010
Subjects:
QD Chemistry
Online Access:http://eprints.utm.my/id/eprint/18799/5/EriawanRismanaPFSA2010.pdf
Tags: Add Tag
No Tags, Be the first to tag this record!
id my-utm-ep.18799
record_format uketd_dc
spelling my-utm-ep.187992017-09-13T04:40:00Z Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites 2010 Rismana, Eriawan QD Chemistry TA Engineering (General). Civil engineering (General) Semiconductor/polymer nanocomposites are of increasing importance with their tunable properties being used as dielectric materials. This thesis focused on cadmium sulfide (CdS)/polymer nanocomposites. CdS has been combined with three polymer matrices, i.e. poly(styrene-divinylbenzene) [P(S-DVB)], poly(methacrylic acid-ethyleneglycoldimethacrylic acid) [P(MAA-EGDMA)] and sulfonated poly(styrene-divinylbenzene) [SO3H-P(S-DVB)]. CdS/P(S-DVB) nanocomposite was synthesized by in-situ polymerization in a miniemulsion system using monomer as oil-phase. CdS/P(MAA-EGDMA) nanocomposite has been synthesized by ion exchange and precipitation processes. While, the CdS/SO3-P(S-DVB) nanocomposite has been prepared by sulfonation, ion exchange and precipitation. Agglomerated nanoclusters of CdS were obtained from the above in-situ preparation methods. The structure-dielectric property relationship of the nanocomposites is elucidated by various techniques such as UV – Vis, FTIR, UV-Vis DR, TEM, SEM, XRD, impedance analyzer, AAS, EDX, thermal conductivity analyzer and thermogravimetric analysis. Dielectric properties of the CdS/polymer nanocomposites have been studied at frequencies of 0.1 – 1,000 kHz. The decrease in dielectric constant was found in CdS/SO3H-P(S-DVB) nanocomposite. Considering that the SO3H-P(S-DVB) has very high dielectric constant due to its proton mobility, the replacement of the proton of SO3H-P(S-DVB) with the CdS particles caused the decrease in dielectric constant of the nanocomposite. Interestingly, an increase in the dielectric constant was also observed in CdS/P(S-DVB) and CdS/P(MAA-EGDMA) nanocomposites compared to that of CdS nanoparticles or pure polymers. It is also demonstrated that the unusual enhancement of dielectric constant of CdS/P(MAAEGDMA) depended on the concentration of CdS nanoparticles. The occurrence of strong interfacial interaction between CdS nanoparticles with P(MAA-EGDMA) polymer has been proved by FTIR spectra. One explains that an increase in dielectric constant is due to the increase of interfacial interaction among CdS nanoparticles and also CdS nanoparticles with polymer. These interactions increase the mobility of charge carriers and polarizability of electron. Based on the results of this study, it can be suggested that dielectric properties of CdS/polymer nanocomposites can be explained by the following unique properties i.e. nanosize of CdS particles, semiconductor property of CdS, the interfacial interaction between CdS nanoparticles and polymer and intrinsic properties of polymer. These conclusions lay the foundation for developing new synthetic strategies for designing new dielectric materials by varying the size, concentration and distribution of CdS nanoclusters in various polymer matrices. 2010 Thesis http://eprints.utm.my/id/eprint/18799/ http://eprints.utm.my/id/eprint/18799/5/EriawanRismanaPFSA2010.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution Universiti Teknologi Malaysia
collection UTM Institutional Repository
language English
topic QD Chemistry
QD Chemistry
spellingShingle QD Chemistry
QD Chemistry
Rismana, Eriawan
Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites
description Semiconductor/polymer nanocomposites are of increasing importance with their tunable properties being used as dielectric materials. This thesis focused on cadmium sulfide (CdS)/polymer nanocomposites. CdS has been combined with three polymer matrices, i.e. poly(styrene-divinylbenzene) [P(S-DVB)], poly(methacrylic acid-ethyleneglycoldimethacrylic acid) [P(MAA-EGDMA)] and sulfonated poly(styrene-divinylbenzene) [SO3H-P(S-DVB)]. CdS/P(S-DVB) nanocomposite was synthesized by in-situ polymerization in a miniemulsion system using monomer as oil-phase. CdS/P(MAA-EGDMA) nanocomposite has been synthesized by ion exchange and precipitation processes. While, the CdS/SO3-P(S-DVB) nanocomposite has been prepared by sulfonation, ion exchange and precipitation. Agglomerated nanoclusters of CdS were obtained from the above in-situ preparation methods. The structure-dielectric property relationship of the nanocomposites is elucidated by various techniques such as UV – Vis, FTIR, UV-Vis DR, TEM, SEM, XRD, impedance analyzer, AAS, EDX, thermal conductivity analyzer and thermogravimetric analysis. Dielectric properties of the CdS/polymer nanocomposites have been studied at frequencies of 0.1 – 1,000 kHz. The decrease in dielectric constant was found in CdS/SO3H-P(S-DVB) nanocomposite. Considering that the SO3H-P(S-DVB) has very high dielectric constant due to its proton mobility, the replacement of the proton of SO3H-P(S-DVB) with the CdS particles caused the decrease in dielectric constant of the nanocomposite. Interestingly, an increase in the dielectric constant was also observed in CdS/P(S-DVB) and CdS/P(MAA-EGDMA) nanocomposites compared to that of CdS nanoparticles or pure polymers. It is also demonstrated that the unusual enhancement of dielectric constant of CdS/P(MAAEGDMA) depended on the concentration of CdS nanoparticles. The occurrence of strong interfacial interaction between CdS nanoparticles with P(MAA-EGDMA) polymer has been proved by FTIR spectra. One explains that an increase in dielectric constant is due to the increase of interfacial interaction among CdS nanoparticles and also CdS nanoparticles with polymer. These interactions increase the mobility of charge carriers and polarizability of electron. Based on the results of this study, it can be suggested that dielectric properties of CdS/polymer nanocomposites can be explained by the following unique properties i.e. nanosize of CdS particles, semiconductor property of CdS, the interfacial interaction between CdS nanoparticles and polymer and intrinsic properties of polymer. These conclusions lay the foundation for developing new synthetic strategies for designing new dielectric materials by varying the size, concentration and distribution of CdS nanoclusters in various polymer matrices.
format Thesis
qualification_name Doctor of Philosophy (PhD.)
qualification_level Doctorate
author Rismana, Eriawan
author_facet Rismana, Eriawan
author_sort Rismana, Eriawan
title Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites
title_short Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites
title_full Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites
title_fullStr Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites
title_full_unstemmed Synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites
title_sort synthesis, characterization and dielectric properties of cadmium sulfide polymer nanocomposites
granting_institution Universiti Teknologi Malaysia, Faculty of Science
granting_department Faculty of Science
publishDate 2010
url http://eprints.utm.my/id/eprint/18799/5/EriawanRismanaPFSA2010.pdf
_version_ 1747815361660583936

Similar Items