Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method

Willemite is an inorganic phosphor material used for optoelectronic applications. Much attention has been paid to the synthesis of willemite nanoparticles in the last two decades. This includes the application of new methods or modification of the existing ones. The present study proposes a polymer...

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Main Author:	Mustapha, Alibe Ibrahim
Format:	Thesis
Language:	English
Published:	2019
Subjects:	Chemical kinetics - Effect of temperature on Heat treatment
Online Access:	http://psasir.upm.edu.my/id/eprint/82868/1/ITMA%202019%202%20IR.pdf
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spelling	my-upm-ir.828682022-01-11T07:50:32Z Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method 2019-02 Mustapha, Alibe Ibrahim Willemite is an inorganic phosphor material used for optoelectronic applications. Much attention has been paid to the synthesis of willemite nanoparticles in the last two decades. This includes the application of new methods or modification of the existing ones. The present study proposes a polymer thermal treatment method involving calcination temperature between 500 to 1000 °C to fabricate the willemite nanoparticles. The effects of synthesis parameters such as the calcination temperature, calcination holding time, PVP concentration, and the precursor concentration were extensively studied and optimized. The FT–IR, Raman and the XRD analysis revealed that the samples were amorphous at room temperature and further confirmed the formation of pure willemite nanoparticles upon the calcination process. The crystallite size of the materials ranges between 21.60–32.15 nm and increases with the increment of the calcination temperatures, calcination holding time and precursor. While the crystallite size was found to be reduced from 36.70– 23.80 nm with the increase in the PVP concentration (2–5 g) for the willemite nanoparticles produced at 900 °C. This is in a good agreement with the particle size determined by HR–TEM and FESEM micrographs. The Eopt values decreased with the increased of holding times over the range of 5.39 eV at 1 h to 5.27 at 4 h. The Eopt of the material was also found to be increasing from 5.24–5.32 eV with the corresponding increase in the PVP concentration. The PL emission spectra reveal a blue emission at 485 nm due to zinc interstitial. For all the synthesis condition, the PL emission was found to be depended on the particle size of the willemite. The current findings provide a pathway to reduce the high energy consumed in the synthesis of willemite nanoparticles, and the wide band gap energy of the material may have key potential applications for future optoelectronic lighting devices. Chemical kinetics - Effect of temperature on Heat treatment 2019-02 Thesis http://psasir.upm.edu.my/id/eprint/82868/ http://psasir.upm.edu.my/id/eprint/82868/1/ITMA%202019%202%20IR.pdf text en public doctoral Universiti Putra Malaysia Chemical kinetics - Effect of temperature on Heat treatment Matori, Khamirul Amin
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
advisor	Matori, Khamirul Amin
topic	Chemical kinetics - Effect of temperature on Heat treatment
spellingShingle	Chemical kinetics - Effect of temperature on Heat treatment Mustapha, Alibe Ibrahim Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method
description	Willemite is an inorganic phosphor material used for optoelectronic applications. Much attention has been paid to the synthesis of willemite nanoparticles in the last two decades. This includes the application of new methods or modification of the existing ones. The present study proposes a polymer thermal treatment method involving calcination temperature between 500 to 1000 °C to fabricate the willemite nanoparticles. The effects of synthesis parameters such as the calcination temperature, calcination holding time, PVP concentration, and the precursor concentration were extensively studied and optimized. The FT–IR, Raman and the XRD analysis revealed that the samples were amorphous at room temperature and further confirmed the formation of pure willemite nanoparticles upon the calcination process. The crystallite size of the materials ranges between 21.60–32.15 nm and increases with the increment of the calcination temperatures, calcination holding time and precursor. While the crystallite size was found to be reduced from 36.70– 23.80 nm with the increase in the PVP concentration (2–5 g) for the willemite nanoparticles produced at 900 °C. This is in a good agreement with the particle size determined by HR–TEM and FESEM micrographs. The Eopt values decreased with the increased of holding times over the range of 5.39 eV at 1 h to 5.27 at 4 h. The Eopt of the material was also found to be increasing from 5.24–5.32 eV with the corresponding increase in the PVP concentration. The PL emission spectra reveal a blue emission at 485 nm due to zinc interstitial. For all the synthesis condition, the PL emission was found to be depended on the particle size of the willemite. The current findings provide a pathway to reduce the high energy consumed in the synthesis of willemite nanoparticles, and the wide band gap energy of the material may have key potential applications for future optoelectronic lighting devices.
format	Thesis
qualification_level	Doctorate
author	Mustapha, Alibe Ibrahim
author_facet	Mustapha, Alibe Ibrahim
author_sort	Mustapha, Alibe Ibrahim
title	Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method
title_short	Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method
title_full	Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method
title_fullStr	Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method
title_full_unstemmed	Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method
title_sort	structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method
granting_institution	Universiti Putra Malaysia
publishDate	2019
url	http://psasir.upm.edu.my/id/eprint/82868/1/ITMA%202019%202%20IR.pdf
_version_	1747813325602816000

Structural and optical properties of willemite nanoparticles synthesized by polymer thermal treatment method

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