Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi

Zinc oxide (ZnO) nanostructures on gold-seeded silicon (Si) substrate were prepared using a low-temperature solution-immersion method. Optimised ZnO structures were then used as a template to grow a second layer of ZnO nanostructures by mistatomisation method. Low-dimensional, vertically-aligne...

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Main Author:	Khusaimi, Zuraida
Format:	Book Section
Language:	English
Published:	Institute of Graduate Studies, UiTM 2012
Subjects:	Dissertations, Academic. Preparation of theses
Online Access:	http://ir.uitm.edu.my/id/eprint/19063/ http://ir.uitm.edu.my/id/eprint/19063/1/ABS_ZURAIDA%20KHUSAIMI%20TDRA%20VOL%201%20IGS%2012.pdf

id	uitm-19063
recordtype	eprints
spelling	uitm-190632018-06-08T01:20:20Z http://ir.uitm.edu.my/id/eprint/19063/ Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi Khusaimi, Zuraida Dissertations, Academic. Preparation of theses Zinc oxide (ZnO) nanostructures on gold-seeded silicon (Si) substrate were prepared using a low-temperature solution-immersion method. Optimised ZnO structures were then used as a template to grow a second layer of ZnO nanostructures by mistatomisation method. Low-dimensional, vertically-aligned ZnO nanorods were successfully synthesised by the solution-immersion method through optimisation of the reaction parameters, such as concentration of precursor, ratio of stabiliser, alignment of substrate in solution, heating medium, gold-seeded substrates and its thickness, transition metal-seeded substrates, immersion temperature and time, pH of precursor solution, annealing temperature and doping with Mg. SEM, FESEM, TGA, FTIR, XRD, EDX, PL-Raman and I-V were the selected characterisation tools to analyse the structural, morphological, bonding, optical and electrical properties of the nanostructures. TGA and FTIR analyses gave evidence that the prepared ZnO nanostructures were pure with no traces of starting material or contamination. The results give evidence that 6 nm thickness of gold-seeded on Si substrate immersed for 4 hours at 70°C in precursor concentration of 0.005 – 0.05 M zinc nitrate hexahydrate (Zn(NO3)2.6H2O) and hexamethylenetetramine (HMTA) at 1:1 ratio has successfully formed (002) plane, c-axis, aligned ZnO nanorods with diameter of approximately 60 ± 20 nm. The nanorods prepared at low immersion temperatures were found to be readily crystalline with no additional heat treatment. Precursor solution of pH 6.8 and 5 produced ZnO nanorods, while at pH 9 produced ZnO flower-like structures. 1 atomic % of Mg-doped ZnO nanorods were found to produce the highest electrical conductivity relative to as-prepared ZnO, and higher doping content of 3, 5, 7 and 9 atomic %. PL emission spectra of ZnO nanorods consistently produced UV (362-388 nm) and visible emissions (400-800 nm), confirming the formation of a semi-conducting ZnO. Institute of Graduate Studies, UiTM 2012 Book Section PeerReviewed text en http://ir.uitm.edu.my/id/eprint/19063/1/ABS_ZURAIDA%20KHUSAIMI%20TDRA%20VOL%201%20IGS%2012.pdf Khusaimi, Zuraida (2012) Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi. In: The Doctoral Research Abstracts. IPSis Biannual Publication, 1 (1). Institute of Graduate Studies, UiTM, Shah Alam.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
language	English
topic	Dissertations, Academic. Preparation of theses
spellingShingle	Dissertations, Academic. Preparation of theses Khusaimi, Zuraida Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi
description	Zinc oxide (ZnO) nanostructures on gold-seeded silicon (Si) substrate were prepared using a low-temperature solution-immersion method. Optimised ZnO structures were then used as a template to grow a second layer of ZnO nanostructures by mistatomisation method. Low-dimensional, vertically-aligned ZnO nanorods were successfully synthesised by the solution-immersion method through optimisation of the reaction parameters, such as concentration of precursor, ratio of stabiliser, alignment of substrate in solution, heating medium, gold-seeded substrates and its thickness, transition metal-seeded substrates, immersion temperature and time, pH of precursor solution, annealing temperature and doping with Mg. SEM, FESEM, TGA, FTIR, XRD, EDX, PL-Raman and I-V were the selected characterisation tools to analyse the structural, morphological, bonding, optical and electrical properties of the nanostructures. TGA and FTIR analyses gave evidence that the prepared ZnO nanostructures were pure with no traces of starting material or contamination. The results give evidence that 6 nm thickness of gold-seeded on Si substrate immersed for 4 hours at 70°C in precursor concentration of 0.005 – 0.05 M zinc nitrate hexahydrate (Zn(NO3)2.6H2O) and hexamethylenetetramine (HMTA) at 1:1 ratio has successfully formed (002) plane, c-axis, aligned ZnO nanorods with diameter of approximately 60 ± 20 nm. The nanorods prepared at low immersion temperatures were found to be readily crystalline with no additional heat treatment. Precursor solution of pH 6.8 and 5 produced ZnO nanorods, while at pH 9 produced ZnO flower-like structures. 1 atomic % of Mg-doped ZnO nanorods were found to produce the highest electrical conductivity relative to as-prepared ZnO, and higher doping content of 3, 5, 7 and 9 atomic %. PL emission spectra of ZnO nanorods consistently produced UV (362-388 nm) and visible emissions (400-800 nm), confirming the formation of a semi-conducting ZnO.
format	Book Section
author	Khusaimi, Zuraida
author_facet	Khusaimi, Zuraida
author_sort	Khusaimi, Zuraida
title	Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi
title_short	Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi
title_full	Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi
title_fullStr	Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi
title_full_unstemmed	Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi
title_sort	synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / zuraida khusaimi
publisher	Institute of Graduate Studies, UiTM
publishDate	2012
url	http://ir.uitm.edu.my/id/eprint/19063/ http://ir.uitm.edu.my/id/eprint/19063/1/ABS_ZURAIDA%20KHUSAIMI%20TDRA%20VOL%201%20IGS%2012.pdf
first_indexed	2023-09-18T23:01:46Z
last_indexed	2023-09-18T23:01:46Z
_version_	1777418220220710912

Synthesis and characterisation of low- dimensional zinc oxide nanostructures by solution-immersion and mist-atomisation / Zuraida Khusaimi

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