Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model

An accurate modelling of catalytic growth of carbon nanotubes (CNTs) is needed to model the physics of carbon adsorption and diffusion into the catalyst surface along with the catalyst deactivation. The model should be able to provide a physical response towards the change of temperature and partial...

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Main Authors: Zainal, M. T., Mohd. Yasin, M. F., Wahid, M. A.
Format: Article
Published: Institute of Physics Publishing 2016
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Online Access:http://eprints.utm.my/id/eprint/71987/
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994415938&doi=10.1088%2f2053-1591%2f3%2f10%2f105040&partnerID=40&md5=96049d4e3298d54f64da015e2660c2c0
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Institution: Universiti Teknologi Malaysia
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spelling my.utm.719872017-11-16T05:27:35Z http://eprints.utm.my/id/eprint/71987/ Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model Zainal, M. T. Mohd. Yasin, M. F. Wahid, M. A. TJ Mechanical engineering and machinery An accurate modelling of catalytic growth of carbon nanotubes (CNTs) is needed to model the physics of carbon adsorption and diffusion into the catalyst surface along with the catalyst deactivation. The model should be able to provide a physical response towards the change of temperature and partial pressure. Though the effects of temperature and partial pressure on the growth rate has been studied individually, the coupled effects of the two parameters has yet to be emphasized. Amodified growth rate model that unified the terms from previously developed models successfully captured the essential physics during the growth and provided physical response towards the change of temperature and partial pressure. The model validation was done against a chemical vapour deposition (CVD) experiment that employed acetylene and cobalt as the carbon source and the catalyst respectively where the modified model managed to predict theCNTterminal length more accurately compared to the standard model with5%maximum error. A comprehensive parametric study on the effects of temperature and partial pressure on the growth rate and terminal length successfully reveals the minimum partial pressure of 5 Torr for a given operating condition below which the growth rate is significantly low regardless of any increase of temperature. Three regions of growth in the partial pressure-temperature domain are identified based on the magnitude of terminal length. The model can serve as a guideline for the determination and optimisation of the baseline operating conditions in future experiments on catalytic growth of CNT, with emphasis on the CVD and flame synthesis techniques. Institute of Physics Publishing 2016 Article PeerReviewed Zainal, M. T. and Mohd. Yasin, M. F. and Wahid, M. A. (2016) Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model. Materials Research Express, 3 (10). ISSN 2053-1591 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994415938&doi=10.1088%2f2053-1591%2f3%2f10%2f105040&partnerID=40&md5=96049d4e3298d54f64da015e2660c2c0
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Zainal, M. T.
Mohd. Yasin, M. F.
Wahid, M. A.
Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model
description An accurate modelling of catalytic growth of carbon nanotubes (CNTs) is needed to model the physics of carbon adsorption and diffusion into the catalyst surface along with the catalyst deactivation. The model should be able to provide a physical response towards the change of temperature and partial pressure. Though the effects of temperature and partial pressure on the growth rate has been studied individually, the coupled effects of the two parameters has yet to be emphasized. Amodified growth rate model that unified the terms from previously developed models successfully captured the essential physics during the growth and provided physical response towards the change of temperature and partial pressure. The model validation was done against a chemical vapour deposition (CVD) experiment that employed acetylene and cobalt as the carbon source and the catalyst respectively where the modified model managed to predict theCNTterminal length more accurately compared to the standard model with5%maximum error. A comprehensive parametric study on the effects of temperature and partial pressure on the growth rate and terminal length successfully reveals the minimum partial pressure of 5 Torr for a given operating condition below which the growth rate is significantly low regardless of any increase of temperature. Three regions of growth in the partial pressure-temperature domain are identified based on the magnitude of terminal length. The model can serve as a guideline for the determination and optimisation of the baseline operating conditions in future experiments on catalytic growth of CNT, with emphasis on the CVD and flame synthesis techniques.
format Article
author Zainal, M. T.
Mohd. Yasin, M. F.
Wahid, M. A.
author_facet Zainal, M. T.
Mohd. Yasin, M. F.
Wahid, M. A.
author_sort Zainal, M. T.
title Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model
title_short Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model
title_full Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model
title_fullStr Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model
title_full_unstemmed Investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model
title_sort investigation of the coupled effects of temperature and partial pressure on catalytic growth of carbon nanotubes using a modified growth rate model
publisher Institute of Physics Publishing
publishDate 2016
url http://eprints.utm.my/id/eprint/71987/
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994415938&doi=10.1088%2f2053-1591%2f3%2f10%2f105040&partnerID=40&md5=96049d4e3298d54f64da015e2660c2c0
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