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High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures

Carbon nanofibers (CNF) produced from pyrolysis of electrospun polyacrylonitrile (PAN) precursor has received a great amount of attention due to their promising potentials. However, there are limited studies on the electrical properties of the CNF, especially at high-frequency range. In this study,...

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Main Authors:	Munajat, N. A., Nurfaizey, A. H., Bahar, A. A. M., You, K. Y., Fadzullah, S. H. S. M., Omar, G.
Format:	Article
Published:	John Wiley and Sons Inc. 2018
Subjects:	TK Electrical engineering. Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/84594/ http://dx.doi.org/10.1002/mop.31326
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spelling	my.utm.845942020-02-27T03:20:32Z http://eprints.utm.my/id/eprint/84594/ High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures Munajat, N. A. Nurfaizey, A. H. Bahar, A. A. M. You, K. Y. Fadzullah, S. H. S. M. Omar, G. TK Electrical engineering. Electronics Nuclear engineering Carbon nanofibers (CNF) produced from pyrolysis of electrospun polyacrylonitrile (PAN) precursor has received a great amount of attention due to their promising potentials. However, there are limited studies on the electrical properties of the CNF, especially at high-frequency range. In this study, CNF from PAN precursor were produced by electrospinning technique. Characterizations of the nanofibers were carried out in terms of physical, dielectric, and chemical properties. The stabilization of nanofibers took place at 240°C whilst carbonization process took place at temperatures of 800°C, 1000°C, and 1200°C, respectively. In terms of physical properties, the color of the nanofiber webs changed from white to brown and black, after stabilization and carbonization process accompanied by significant reduction in average fiber diameter. Dielectric analysis of the nanofibers was obtained by measuring the wave propagation characteristics at frequency range of 1 GHz to 10 GHz. Higher dielectric constants of the material were observed for fibers processed at higher carbonization temperatures. Good conductivity was also observed with loss tangent value that is higher than 1. The results were correlated with FTIR transmittance results, indicating greater amount of carbon are present in the nanofiber material. From the findings, the unique behavior of the nanofibers makes it practically potential for sensor applications. Explorations of future research in this area are to be sought. John Wiley and Sons Inc. 2018-09 Article PeerReviewed Munajat, N. A. and Nurfaizey, A. H. and Bahar, A. A. M. and You, K. Y. and Fadzullah, S. H. S. M. and Omar, G. (2018) High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures. Microwave and Optical Technology Letters, 60 (9). pp. 2198-2204. ISSN 0895-2477 http://dx.doi.org/10.1002/mop.31326
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	TK Electrical engineering. Electronics Nuclear engineering
spellingShingle	TK Electrical engineering. Electronics Nuclear engineering Munajat, N. A. Nurfaizey, A. H. Bahar, A. A. M. You, K. Y. Fadzullah, S. H. S. M. Omar, G. High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures
description	Carbon nanofibers (CNF) produced from pyrolysis of electrospun polyacrylonitrile (PAN) precursor has received a great amount of attention due to their promising potentials. However, there are limited studies on the electrical properties of the CNF, especially at high-frequency range. In this study, CNF from PAN precursor were produced by electrospinning technique. Characterizations of the nanofibers were carried out in terms of physical, dielectric, and chemical properties. The stabilization of nanofibers took place at 240°C whilst carbonization process took place at temperatures of 800°C, 1000°C, and 1200°C, respectively. In terms of physical properties, the color of the nanofiber webs changed from white to brown and black, after stabilization and carbonization process accompanied by significant reduction in average fiber diameter. Dielectric analysis of the nanofibers was obtained by measuring the wave propagation characteristics at frequency range of 1 GHz to 10 GHz. Higher dielectric constants of the material were observed for fibers processed at higher carbonization temperatures. Good conductivity was also observed with loss tangent value that is higher than 1. The results were correlated with FTIR transmittance results, indicating greater amount of carbon are present in the nanofiber material. From the findings, the unique behavior of the nanofibers makes it practically potential for sensor applications. Explorations of future research in this area are to be sought.
format	Article
author	Munajat, N. A. Nurfaizey, A. H. Bahar, A. A. M. You, K. Y. Fadzullah, S. H. S. M. Omar, G.
author_facet	Munajat, N. A. Nurfaizey, A. H. Bahar, A. A. M. You, K. Y. Fadzullah, S. H. S. M. Omar, G.
author_sort	Munajat, N. A.
title	High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures
title_short	High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures
title_full	High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures
title_fullStr	High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures
title_full_unstemmed	High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures
title_sort	high-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures
publisher	John Wiley and Sons Inc.
publishDate	2018
url	http://eprints.utm.my/id/eprint/84594/ http://dx.doi.org/10.1002/mop.31326
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score	13.211869

High-frequency dielectric analysis of carbon nanofibers from pan precursor at different pyrolysis temperatures

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