Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates

The undoped and Al-doped ZnO nanostructures were fabricated on the Si (100) substrates via catalyst free thermal evaporation method using a horizontal quartz tube under controlled supply of O2 gas. The substrate was placed vertically above the source materials unlike the conventional methods. The un...

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Main Author:	Dorji, Tashi
Format:	Thesis
Language:	English
Published:	2013
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/78414/1/TashiJordiMFS20131.pdf
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spelling	my-utm-ep.784142018-08-26T11:54:48Z Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates 2013-06 Dorji, Tashi QC Physics The undoped and Al-doped ZnO nanostructures were fabricated on the Si (100) substrates via catalyst free thermal evaporation method using a horizontal quartz tube under controlled supply of O2 gas. The substrate was placed vertically above the source materials unlike the conventional methods. The undoped ZnO nanowires were randomly oriented. When both Al dopant and when doping concentrations were increased, ZnO showed various morphologies in which ZnO changed from randomly orientated nanowires to hexagonal shaped, ‘pencil-like’ nanorods. Further increase in dopant concentrations beyond 2.4 at% lead to spikey ZnO:Al morphology. The morphology and crystalline structure of ZnO nanostructures were characterized using X-ray diffraction, field emission scanning electron microscopy, scanning electron microscopy and photoluminescence (PL) spectroscopy. ZnO:Al nanorods were found to have diameter roughly between 260 to 350 nm and the length about 720 nm. The as prepared ZnO:Al nanorods also exhibited a strong UV emission. The Al doping concentrations played an important role on the morphology and optical properties of ZnO nanostructures. The significance of the experiment is the simplicity, low cost and fewer necessary apparatus of the process that would suit the high-throughput fabrication of ZnO:Al nanorods. They are expected to have potential applications in functional Si based nanodevices. 2013-06 Thesis http://eprints.utm.my/id/eprint/78414/ http://eprints.utm.my/id/eprint/78414/1/TashiJordiMFS20131.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:79994 masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Dorji, Tashi Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates
description	The undoped and Al-doped ZnO nanostructures were fabricated on the Si (100) substrates via catalyst free thermal evaporation method using a horizontal quartz tube under controlled supply of O2 gas. The substrate was placed vertically above the source materials unlike the conventional methods. The undoped ZnO nanowires were randomly oriented. When both Al dopant and when doping concentrations were increased, ZnO showed various morphologies in which ZnO changed from randomly orientated nanowires to hexagonal shaped, ‘pencil-like’ nanorods. Further increase in dopant concentrations beyond 2.4 at% lead to spikey ZnO:Al morphology. The morphology and crystalline structure of ZnO nanostructures were characterized using X-ray diffraction, field emission scanning electron microscopy, scanning electron microscopy and photoluminescence (PL) spectroscopy. ZnO:Al nanorods were found to have diameter roughly between 260 to 350 nm and the length about 720 nm. The as prepared ZnO:Al nanorods also exhibited a strong UV emission. The Al doping concentrations played an important role on the morphology and optical properties of ZnO nanostructures. The significance of the experiment is the simplicity, low cost and fewer necessary apparatus of the process that would suit the high-throughput fabrication of ZnO:Al nanorods. They are expected to have potential applications in functional Si based nanodevices.
format	Thesis
qualification_level	Master's degree
author	Dorji, Tashi
author_facet	Dorji, Tashi
author_sort	Dorji, Tashi
title	Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates
title_short	Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates
title_full	Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates
title_fullStr	Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates
title_full_unstemmed	Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates
title_sort	synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2013
url	http://eprints.utm.my/id/eprint/78414/1/TashiJordiMFS20131.pdf
_version_	1747817983175032832

Synthesis and characterization of aluminum doped zinc oxide nanowires on non-catalytic silica substrates

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