Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar

Vertically aligned carbon nanotubes (VACNT) were synthesized using palm oil as an environmentally friendly starting material. The synthesis was carried out in a thermal chemical vapour deposition reactor. Parametric studies were done to determine the optimum parameters to obtain VACNT with favourabl...

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Main Author:	Abu Bakar, Suriani
Format:	Thesis
Language:	English
Published:	2011
Subjects:	Atomic physics Constitution and properties of matter Nanostructures
Online Access:	https://ir.uitm.edu.my/id/eprint/39780/1/39780.pdf
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spelling	my-uitm-ir.397802021-08-25T09:31:51Z Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar 2011-09 Abu Bakar, Suriani Atomic physics. Constitution and properties of matter Nanostructures Vertically aligned carbon nanotubes (VACNT) were synthesized using palm oil as an environmentally friendly starting material. The synthesis was carried out in a thermal chemical vapour deposition reactor. Parametric studies were done to determine the optimum parameters to obtain VACNT with favourable properties at high volume. The parameters included seeded and floated catalyst preparation method, stacking substrate configuration (lower and upper growth), synthesis temperature (700- 900°C), palm oil vaporization temperature (300-600°C), synthesis time (5-90 min), different carbon precursor (palm oil and waste cooking palm oil), substrate positioning (position 1-6), ferrocene concentration (0.67-5.33 wt%) and different carrier gas (argon and nitrogen). The carbon nanotubes (CNT) products were then characterized using several analytical techniques which were electron microscopy, energy dispersive x-ray analysis, micro-Raman and Fourier transform infrared (FTIR) spectroscopy, thermogravimetry analysis (TGA) and CHNS-0 analysis. Prior to the synthesis process, several analyses such as TGA, gas chromatography-mass spectrometry and FTIR characterizations were done on the carbon precursor namely palm oil and waste cooking palm oil in order to facilitate the optimization procedures of VACNT. For every synthesis parameter, the nanotubes growth rates were measured and the nucleation as well as termination factor were investigated. CNT diameter, degree of alignment, crystallinity and purity were extensively studied as they were found to be greatly affected by the synthesis parameters. Based on the inspection of the morphology and crystallinity of CNT it was found that the following parameters can be considered as the optimized parameter to produce higher quality of bulk VACNT in our reactor; the floated catalyst and lower growth approach at the synthesis temperature in range of 750-800°C, precursor vaporization temperature in the range of 400-500°C, the synthesis temperature of 15 to 35 mins, sample position at P2 and P3, and ferrocene concentration of 1.33 - 5.33 wt%. Synthesizing VACNT within nitrogen ambient produces higher VACNT growth rate with considerably more bamboo-liked structure as compared to argon ambient. In this study, we have also demonstrated that waste cooking palm oil from domestic 2011-09 Thesis https://ir.uitm.edu.my/id/eprint/39780/ https://ir.uitm.edu.my/id/eprint/39780/1/39780.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Applied Sciences Rusop, Mohamad (Assoc. Prof. Dr.)
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Rusop, Mohamad (Assoc. Prof. Dr.)
topic	Atomic physics Constitution and properties of matter Nanostructures
spellingShingle	Atomic physics Constitution and properties of matter Nanostructures Abu Bakar, Suriani Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar
description	Vertically aligned carbon nanotubes (VACNT) were synthesized using palm oil as an environmentally friendly starting material. The synthesis was carried out in a thermal chemical vapour deposition reactor. Parametric studies were done to determine the optimum parameters to obtain VACNT with favourable properties at high volume. The parameters included seeded and floated catalyst preparation method, stacking substrate configuration (lower and upper growth), synthesis temperature (700- 900°C), palm oil vaporization temperature (300-600°C), synthesis time (5-90 min), different carbon precursor (palm oil and waste cooking palm oil), substrate positioning (position 1-6), ferrocene concentration (0.67-5.33 wt%) and different carrier gas (argon and nitrogen). The carbon nanotubes (CNT) products were then characterized using several analytical techniques which were electron microscopy, energy dispersive x-ray analysis, micro-Raman and Fourier transform infrared (FTIR) spectroscopy, thermogravimetry analysis (TGA) and CHNS-0 analysis. Prior to the synthesis process, several analyses such as TGA, gas chromatography-mass spectrometry and FTIR characterizations were done on the carbon precursor namely palm oil and waste cooking palm oil in order to facilitate the optimization procedures of VACNT. For every synthesis parameter, the nanotubes growth rates were measured and the nucleation as well as termination factor were investigated. CNT diameter, degree of alignment, crystallinity and purity were extensively studied as they were found to be greatly affected by the synthesis parameters. Based on the inspection of the morphology and crystallinity of CNT it was found that the following parameters can be considered as the optimized parameter to produce higher quality of bulk VACNT in our reactor; the floated catalyst and lower growth approach at the synthesis temperature in range of 750-800°C, precursor vaporization temperature in the range of 400-500°C, the synthesis temperature of 15 to 35 mins, sample position at P2 and P3, and ferrocene concentration of 1.33 - 5.33 wt%. Synthesizing VACNT within nitrogen ambient produces higher VACNT growth rate with considerably more bamboo-liked structure as compared to argon ambient. In this study, we have also demonstrated that waste cooking palm oil from domestic
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abu Bakar, Suriani
author_facet	Abu Bakar, Suriani
author_sort	Abu Bakar, Suriani
title	Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar
title_short	Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar
title_full	Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar
title_fullStr	Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar
title_full_unstemmed	Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar
title_sort	controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / suriani abu bakar
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciences
publishDate	2011
url	https://ir.uitm.edu.my/id/eprint/39780/1/39780.pdf
_version_	1783734537288679424

Controlled growth of vertically aligned carbon nanotubes from palm oil precursor using thermal chemical vapour deposition method and its field electron emission properties / Suriani Abu Bakar

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