Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method

Zinc oxide (ZnO) has been studied due to have a direct wide bandgap (~3.7 eV), large exciton binding energy (~60 meV), non-toxic material. In this study, two step hydrothermal process was introduced to fabricate seed layer in a form of ZnO nanoparticles (ZnO-NPs) and ZnO nanorods (ZnO-NRs). The seed...

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Main Author:	Maarof, Nurul Amiera Shahida
Format:	Thesis
Language:	English English English
Published:	2022
Subjects:	T Technology (General)
Online Access:	http://eprints.uthm.edu.my/8332/1/24p%20NURUL%20AMIERA%20SHAHIDA%20MAAROF.pdf http://eprints.uthm.edu.my/8332/2/NURUL%20AMIERA%20SHAHIDA%20MAAROF%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8332/3/NURUL%20AMIERA%20SHAHIDA%20MAAROF%20WATERMARK.pdf
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spelling	my-uthm-ep.83322023-02-15T07:10:24Z Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method 2022-09 Maarof, Nurul Amiera Shahida T Technology (General) Zinc oxide (ZnO) has been studied due to have a direct wide bandgap (~3.7 eV), large exciton binding energy (~60 meV), non-toxic material. In this study, two step hydrothermal process was introduced to fabricate seed layer in a form of ZnO nanoparticles (ZnO-NPs) and ZnO nanorods (ZnO-NRs). The seed layer solution concentration is 0.3 M and consists of zinc acetate dihydrate (ZAD) and diethanolamine (DEA). Besides that, 5 layers of coated seed layer was deposited using spin coating method. Subsequently, the high quality of aligned hexagonal ZnO-NRs were fabricated using hydrothermal method which consists of an equimolar nutrient solution (0.05 M) synthesized using zinc nitrate hexahydrate (ZNH) and hexamethylenetetramine (HMTA). The hydrothermal reaction times were varied from 1 hour to 9 hours. The structural, morphological, topological, optical and electrical properties of the ZnO-NRs were studied using X-ray diffraction (XRD), Field-Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM), Ultraviolet-visible (UV-Vis) spectroscopy and four-point probe, respectively. Based on the research, the deposition of ZnO-NPs indicated a significant improvement in the well-developed and aligned hexagonal of ZnO-NRs. As a result, ZnO-NRs synthesized with 6 hours of hydrothermal reaction time had an average diameter of 185 nm and rod lengths of 2.04 μm. However, recorded the lowest value of resistivity (0.83 x10-3 Ω.cm) thus, exhibited the highest value of conductivity (12.11 x102 Ω.cm-1). As higher conductivity materials can transfer more electrons, thereby increasing the rate of electron-hole generation. This will lead to greater current flows. Therefore, ZnO-NRs can be widely implemented in electronic devices application such as ultraviolet sensor and thermoelectric application. 2022-09 Thesis http://eprints.uthm.edu.my/8332/ http://eprints.uthm.edu.my/8332/1/24p%20NURUL%20AMIERA%20SHAHIDA%20MAAROF.pdf text en public http://eprints.uthm.edu.my/8332/2/NURUL%20AMIERA%20SHAHIDA%20MAAROF%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/8332/3/NURUL%20AMIERA%20SHAHIDA%20MAAROF%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	T Technology (General)
spellingShingle	T Technology (General) Maarof, Nurul Amiera Shahida Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method
description	Zinc oxide (ZnO) has been studied due to have a direct wide bandgap (~3.7 eV), large exciton binding energy (~60 meV), non-toxic material. In this study, two step hydrothermal process was introduced to fabricate seed layer in a form of ZnO nanoparticles (ZnO-NPs) and ZnO nanorods (ZnO-NRs). The seed layer solution concentration is 0.3 M and consists of zinc acetate dihydrate (ZAD) and diethanolamine (DEA). Besides that, 5 layers of coated seed layer was deposited using spin coating method. Subsequently, the high quality of aligned hexagonal ZnO-NRs were fabricated using hydrothermal method which consists of an equimolar nutrient solution (0.05 M) synthesized using zinc nitrate hexahydrate (ZNH) and hexamethylenetetramine (HMTA). The hydrothermal reaction times were varied from 1 hour to 9 hours. The structural, morphological, topological, optical and electrical properties of the ZnO-NRs were studied using X-ray diffraction (XRD), Field-Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM), Ultraviolet-visible (UV-Vis) spectroscopy and four-point probe, respectively. Based on the research, the deposition of ZnO-NPs indicated a significant improvement in the well-developed and aligned hexagonal of ZnO-NRs. As a result, ZnO-NRs synthesized with 6 hours of hydrothermal reaction time had an average diameter of 185 nm and rod lengths of 2.04 μm. However, recorded the lowest value of resistivity (0.83 x10-3 Ω.cm) thus, exhibited the highest value of conductivity (12.11 x102 Ω.cm-1). As higher conductivity materials can transfer more electrons, thereby increasing the rate of electron-hole generation. This will lead to greater current flows. Therefore, ZnO-NRs can be widely implemented in electronic devices application such as ultraviolet sensor and thermoelectric application.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Maarof, Nurul Amiera Shahida
author_facet	Maarof, Nurul Amiera Shahida
author_sort	Maarof, Nurul Amiera Shahida
title	Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method
title_short	Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method
title_full	Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method
title_fullStr	Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method
title_full_unstemmed	Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method
title_sort	fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2022
url	http://eprints.uthm.edu.my/8332/1/24p%20NURUL%20AMIERA%20SHAHIDA%20MAAROF.pdf http://eprints.uthm.edu.my/8332/2/NURUL%20AMIERA%20SHAHIDA%20MAAROF%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8332/3/NURUL%20AMIERA%20SHAHIDA%20MAAROF%20WATERMARK.pdf
_version_	1776103321864503296

Fabrication of hexagonal zinc oxide nanorods on seeded substrate via hydrothermal method

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