Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application

Among all new carbon-based structures, graphene has drawn the most attention because of its superiority in terms of porosity, elasticity, conductivity, surface area and stability. Recently, more attention has turned to graphene oxide (GO) thin films due to their exceptional structure and electronic...

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Main Author:	Anoud Saud A, Alshammari
Format:	Thesis
Language:	English English
Published:	2021
Subjects:	QC1 Physics (General)
Online Access:	http://eprints.usm.my/52461/1/ALSHAMMARI%2C%20ANOUD%20SAUD%20A%20-%20TESIS24.pdf http://eprints.usm.my/52461/2/ALSHAMMARI%2C%20ANOUD%20SAUD%20A%20-%20TESIS24.pdf
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spelling	my-usm-ep.524612022-04-30T20:41:05Z Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application 2021-10 Anoud Saud A, Alshammari QC1 Physics (General) Among all new carbon-based structures, graphene has drawn the most attention because of its superiority in terms of porosity, elasticity, conductivity, surface area and stability. Recently, more attention has turned to graphene oxide (GO) thin films due to their exceptional structure and electronic properties, which enables their use in the manufacture of organic solar cells, photonic devices and potential applications in energy production and storage. However, the various reductive chemical compounds (hydrazine, sodium borohydride, etc.) in the reduction process to achieve reduced graphene oxide (rGO) are toxic. In this study, firstly a facile and cost-effective approach to synthesize rGO thin film from GO water dispersion were proposed. The rGO thin films were synthesized on glass substrates by means of spray pyrolysis technique (SPT), under different substrate temperatures (50, 100, 150, 200, 250, and 300 °C). All the synthesizes samples were characterized by different techniques such as Raman spectroscopy, field emission scanning electron microscopy (FESEM), X-ray diffraction analysis (XRD), energy-dispersive X-ray (EDX) spectroscopy, and UV–Vis spectroscopy. The reduction of GO to rGO was found initiated after 100 °C, as confirmed by the decrease in oxygen element shown by the EDX. While the resistance of the thin films decreased (i.e. conductivity increases) with increase in temperature. Secondly, the effect of spray cycles was studied on the morphological, structural, and optical properties under numbers of spray cycles (i.e. 2 to 10). The optical analysis showed that the energy band gap of GO and rGO thin films were reduced from 4.2 to 3.27 eV as the spray cycles increased from 2 to 10, which confirms the effect of surface coating thickness on conductivity. 2021-10 Thesis http://eprints.usm.my/52461/ http://eprints.usm.my/52461/1/ALSHAMMARI%2C%20ANOUD%20SAUD%20A%20-%20TESIS24.pdf application/pdf en public http://eprints.usm.my/52461/2/ALSHAMMARI%2C%20ANOUD%20SAUD%20A%20-%20TESIS24.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Sains Fizik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English English
topic	QC1 Physics (General)
spellingShingle	QC1 Physics (General) Anoud Saud A, Alshammari Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application
description	Among all new carbon-based structures, graphene has drawn the most attention because of its superiority in terms of porosity, elasticity, conductivity, surface area and stability. Recently, more attention has turned to graphene oxide (GO) thin films due to their exceptional structure and electronic properties, which enables their use in the manufacture of organic solar cells, photonic devices and potential applications in energy production and storage. However, the various reductive chemical compounds (hydrazine, sodium borohydride, etc.) in the reduction process to achieve reduced graphene oxide (rGO) are toxic. In this study, firstly a facile and cost-effective approach to synthesize rGO thin film from GO water dispersion were proposed. The rGO thin films were synthesized on glass substrates by means of spray pyrolysis technique (SPT), under different substrate temperatures (50, 100, 150, 200, 250, and 300 °C). All the synthesizes samples were characterized by different techniques such as Raman spectroscopy, field emission scanning electron microscopy (FESEM), X-ray diffraction analysis (XRD), energy-dispersive X-ray (EDX) spectroscopy, and UV–Vis spectroscopy. The reduction of GO to rGO was found initiated after 100 °C, as confirmed by the decrease in oxygen element shown by the EDX. While the resistance of the thin films decreased (i.e. conductivity increases) with increase in temperature. Secondly, the effect of spray cycles was studied on the morphological, structural, and optical properties under numbers of spray cycles (i.e. 2 to 10). The optical analysis showed that the energy band gap of GO and rGO thin films were reduced from 4.2 to 3.27 eV as the spray cycles increased from 2 to 10, which confirms the effect of surface coating thickness on conductivity.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Anoud Saud A, Alshammari
author_facet	Anoud Saud A, Alshammari
author_sort	Anoud Saud A, Alshammari
title	Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application
title_short	Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application
title_full	Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application
title_fullStr	Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application
title_full_unstemmed	Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application
title_sort	synthesis and characterization of rgo and tio2/rgo composite via spray pyrolysis technique for photodetector application
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Fizik
publishDate	2021
url	http://eprints.usm.my/52461/1/ALSHAMMARI%2C%20ANOUD%20SAUD%20A%20-%20TESIS24.pdf http://eprints.usm.my/52461/2/ALSHAMMARI%2C%20ANOUD%20SAUD%20A%20-%20TESIS24.pdf
_version_	1747822184439480320

Synthesis And Characterization Of Rgo And Tio2/rgo Composite Via Spray Pyrolysis Technique For Photodetector Application

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