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Substrate Effects on the Growth of Multiwalled Carbon Nanotubes by Thermal Chemical Vapor Deposition

Mathur, A, Roy, SS, Wadhwa, S, Ray, SC, Hazra, K, Misra, DS, Mitra, SK, McLaughlin, JAD and Thundat, T (2012) Substrate Effects on the Growth of Multiwalled Carbon Nanotubes by Thermal Chemical Vapor Deposition. Journal of Computational and Theoretical Nanoscience, 7 (1). p. 21. [Journal article]

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URL: http://dx.doi.org/10.1166/asl.2012.3314

DOI: doi:10.1166/asl.2012.3314

Abstract

Different shapes and sizes of multiwalled carbon nanotubes (MWCNTs) were prepared by the thermal chemical vapor deposition (CVD) process using ferrocene and toluene on conducting (cobalt/silicon), semiconducting (silicon) and insulating (quartz) substrates to investigate the change in surface morphology, microstructure and electron field emission properties. The lengths and diameters of the MWCNTs were estimated from the scanning and transmission electron microscopy, revealing that although the lengths were not identical, changing within the range 150-350 ?m, there was no significant change in diameter. The I D/I G and I D/I G' ratios were obtained from Raman spectra and found to be higher at the tip rather than the sidewalls of MWCNTs grown on different substrates. Electron field emission was also higher for the CNTs grown on the conducting substrate, rather than the semiconducting substrate. Turn-on electric fields obtained from the F-N plot were measured as 0.4 V/?m and 0.7 V/?m for CNTs grown on cobalt/silicon and silicon substrate respectively. © 2012 American Scientific Publishers. All Rights Reserved.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:28355
Deposited By: Mrs Ann Blair
Deposited On:14 Jan 2014 07:00
Last Modified:25 Mar 2015 16:09

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