Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz

In this present work, Zinc oxide (ZnO) nanostructures on gold-coated silicon (Si) substrate were prepared from zinc nitrate hexahydrate (Zn(N03)2.6HO) and urea (CH4N2O) using a low-temperature solution-immersion method. High hierarchical structure of ZnO with high surface area were successfully s...

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Main Author:	Ab. Aziz, Azlinda
Format:	Thesis
Language:	English
Published:	2016
Online Access:	https://ir.uitm.edu.my/id/eprint/18184/2/TM_AZLINDA%20AB.%20AZIZ%20AS%2016_5.pdf
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spelling	my-uitm-ir.181842021-12-08T07:14:15Z Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz 2016 Ab. Aziz, Azlinda In this present work, Zinc oxide (ZnO) nanostructures on gold-coated silicon (Si) substrate were prepared from zinc nitrate hexahydrate (Zn(N03)2.6HO) and urea (CH4N2O) using a low-temperature solution-immersion method. High hierarchical structure of ZnO with high surface area were successfully synthesised by the immersion method through optimization of the reaction parameters, such as different substrate surface, alignment of substrate, concentration of precursor, ratio of stabiliser in solution, and different heat temperature. FESEM, EDX, XRD, AFM and PL were the selected characterization tools to analyse the morphological, structural, surface analysis and optical properties of ZnO nanostructures. FESEM images revealed that ZnO flowerlike microspheres consist of nanosheets was the dominant structure growth along synthesis parameter. The results give evidence that the smallest diameter -11-13 \|um of ZnO micro-flowers was successfully formed on gold-coated Si substrate, and gold served as a nucleation sites for the growth of ZnO micro-flowers. Low average surface roughness of ZnO nanostructures had shown the uniformity of particles size on gold-coated Si surface. The alignment of substrate tilt towards 60 ° was the better alignment towards smallest crystallite size 28.5 nm. PL emission spectra of ZnO nanostructures consistently produced UV (398-416 nm) and visible emissions (450- 750 nm). UV peak corresponds to the ZnO nanostructures while peak at visible range relates to ZnO defects. PL results indicated that 0.40 M concentration of zinc nitrate and urea at 1:1 ratio had successfully formed ZnO micro-flowers consist of nanostructures with high intensity of UV emission, confirming high optical properties of the samples. At 500 °C of thermal treatment, ZnO nanostructures gave extremely high PL intensity which improved its optical property with better crystallization. Furthermore, additional analysis by PL temperature dependence of ZnO nanostructures sample had shown that the emission energies and intensities of the ZnO nanostructured strongly affected by the applied temperature. A plausible mechanism of the dissociation-deposition formation of micro-flower assembly of ZnO nanosheets from Zn(N03)2 and urea solution was also proposed. 2016 Thesis https://ir.uitm.edu.my/id/eprint/18184/ https://ir.uitm.edu.my/id/eprint/18184/2/TM_AZLINDA%20AB.%20AZIZ%20AS%2016_5.pdf text en public mphil masters Universiti Teknologi MARA Faculty of Applied Sciene
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
description	In this present work, Zinc oxide (ZnO) nanostructures on gold-coated silicon (Si) substrate were prepared from zinc nitrate hexahydrate (Zn(N03)2.6HO) and urea (CH4N2O) using a low-temperature solution-immersion method. High hierarchical structure of ZnO with high surface area were successfully synthesised by the immersion method through optimization of the reaction parameters, such as different substrate surface, alignment of substrate, concentration of precursor, ratio of stabiliser in solution, and different heat temperature. FESEM, EDX, XRD, AFM and PL were the selected characterization tools to analyse the morphological, structural, surface analysis and optical properties of ZnO nanostructures. FESEM images revealed that ZnO flowerlike microspheres consist of nanosheets was the dominant structure growth along synthesis parameter. The results give evidence that the smallest diameter -11-13 \|um of ZnO micro-flowers was successfully formed on gold-coated Si substrate, and gold served as a nucleation sites for the growth of ZnO micro-flowers. Low average surface roughness of ZnO nanostructures had shown the uniformity of particles size on gold-coated Si surface. The alignment of substrate tilt towards 60 ° was the better alignment towards smallest crystallite size 28.5 nm. PL emission spectra of ZnO nanostructures consistently produced UV (398-416 nm) and visible emissions (450- 750 nm). UV peak corresponds to the ZnO nanostructures while peak at visible range relates to ZnO defects. PL results indicated that 0.40 M concentration of zinc nitrate and urea at 1:1 ratio had successfully formed ZnO micro-flowers consist of nanostructures with high intensity of UV emission, confirming high optical properties of the samples. At 500 °C of thermal treatment, ZnO nanostructures gave extremely high PL intensity which improved its optical property with better crystallization. Furthermore, additional analysis by PL temperature dependence of ZnO nanostructures sample had shown that the emission energies and intensities of the ZnO nanostructured strongly affected by the applied temperature. A plausible mechanism of the dissociation-deposition formation of micro-flower assembly of ZnO nanosheets from Zn(N03)2 and urea solution was also proposed.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Ab. Aziz, Azlinda
spellingShingle	Ab. Aziz, Azlinda Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz
author_facet	Ab. Aziz, Azlinda
author_sort	Ab. Aziz, Azlinda
title	Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz
title_short	Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz
title_full	Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz
title_fullStr	Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz
title_full_unstemmed	Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz
title_sort	structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / azlinda ab. aziz
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciene
publishDate	2016
url	https://ir.uitm.edu.my/id/eprint/18184/2/TM_AZLINDA%20AB.%20AZIZ%20AS%2016_5.pdf
_version_	1783733633532559360

Structural and photoluminescence properties of nanostructured zinc oxide synthesized by immersion method / Azlinda Ab. Aziz

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