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Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy

Abstract This study deals with the catalytic decomposition of ethylene over Fe2O3/Al2O3 catalyst for the nucleation of nanotubes at growth temperature of 700 to 950 °C. The motivation for conducting this work was primarily an interest in growing a better yield of well-structured MWCNTs by making us...

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Main Authors: Shukrullah, S., Mohamed, N.M., Shaharun, M.S.
Format: Article
Published: Elsevier Ltd 2015
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938086762&doi=10.1016%2fj.diamond.2015.07.005&partnerID=40&md5=3aa3d762e0c639e1212e4b5294196bf4
http://eprints.utp.edu.my/25970/
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spelling my.utp.eprints.259702021-08-30T08:49:06Z Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy Shukrullah, S. Mohamed, N.M. Shaharun, M.S. Abstract This study deals with the catalytic decomposition of ethylene over Fe2O3/Al2O3 catalyst for the nucleation of nanotubes at growth temperature of 700 to 950 °C. The motivation for conducting this work was primarily an interest in growing a better yield of well-structured MWCNTs by making use of the minimum activation energy. A vertically fluidize bed reactor was used to accomplish the experimental work on production of nanotubes. The final product was characterized using a set of imaging, spectroscopic and statistical tools. The required activation energy of the reaction was reduced down to 19.5 kJ/mol. This decrease in activation energy was attributed to Al2O3 promoter and high density of the active sites on the surface of the chemically activated catalyst. Descriptive statistics on the tube diameter distribution revealed the formation of positively skewed histograms at 700 to 800 °C, negatively skewed histograms at 850 to 900 °C and symmetrically skewed histogram at 950 °C. The highest coefficient of variation of 14.5 was calculated in diameter distribution of CNTs grown at 950 °C. A narrow diameter distribution with ideally graphitized tube structures was predicted at the optimum growth temperature of 800 °C. ID/IG and IG'/IG ratios and the product weight loss calculated from the Raman spectra and approximate analyses, respectively, confirmed the growth of 94 pure MWCNTs. © 2015 Elsevier B.V. Elsevier Ltd 2015 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938086762&doi=10.1016%2fj.diamond.2015.07.005&partnerID=40&md5=3aa3d762e0c639e1212e4b5294196bf4 Shukrullah, S. and Mohamed, N.M. and Shaharun, M.S. (2015) Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy. Diamond and Related Materials, 58 . pp. 129-138. http://eprints.utp.edu.my/25970/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description Abstract This study deals with the catalytic decomposition of ethylene over Fe2O3/Al2O3 catalyst for the nucleation of nanotubes at growth temperature of 700 to 950 °C. The motivation for conducting this work was primarily an interest in growing a better yield of well-structured MWCNTs by making use of the minimum activation energy. A vertically fluidize bed reactor was used to accomplish the experimental work on production of nanotubes. The final product was characterized using a set of imaging, spectroscopic and statistical tools. The required activation energy of the reaction was reduced down to 19.5 kJ/mol. This decrease in activation energy was attributed to Al2O3 promoter and high density of the active sites on the surface of the chemically activated catalyst. Descriptive statistics on the tube diameter distribution revealed the formation of positively skewed histograms at 700 to 800 °C, negatively skewed histograms at 850 to 900 °C and symmetrically skewed histogram at 950 °C. The highest coefficient of variation of 14.5 was calculated in diameter distribution of CNTs grown at 950 °C. A narrow diameter distribution with ideally graphitized tube structures was predicted at the optimum growth temperature of 800 °C. ID/IG and IG'/IG ratios and the product weight loss calculated from the Raman spectra and approximate analyses, respectively, confirmed the growth of 94 pure MWCNTs. © 2015 Elsevier B.V.
format Article
author Shukrullah, S.
Mohamed, N.M.
Shaharun, M.S.
spellingShingle Shukrullah, S.
Mohamed, N.M.
Shaharun, M.S.
Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy
author_facet Shukrullah, S.
Mohamed, N.M.
Shaharun, M.S.
author_sort Shukrullah, S.
title Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy
title_short Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy
title_full Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy
title_fullStr Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy
title_full_unstemmed Optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy
title_sort optimum temperature on structural growth of multiwalled carbon nanotubes with low activation energy
publisher Elsevier Ltd
publishDate 2015
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938086762&doi=10.1016%2fj.diamond.2015.07.005&partnerID=40&md5=3aa3d762e0c639e1212e4b5294196bf4
http://eprints.utp.edu.my/25970/
_version_ 1738656805389598720
score 13.211869

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