Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.apsusc.2009.07.111
Title: Electron emission studies of CNTs grown on Ti and Ni containing amorphous carbon nanocomposite films
Authors: Koh, A.T.T.
Hsieh, J.
Chua, D.H.C. 
Keywords: Amorphous carbon
Carbon nanotubes
Electron emission
Nanocomposite
Issue Date: 15-Oct-2009
Citation: Koh, A.T.T., Hsieh, J., Chua, D.H.C. (2009-10-15). Electron emission studies of CNTs grown on Ti and Ni containing amorphous carbon nanocomposite films. Applied Surface Science 256 (1) : 178-182. ScholarBank@NUS Repository. https://doi.org/10.1016/j.apsusc.2009.07.111
Abstract: Carbon nanotubes (CNTs) were grown successfully on the as-deposited dual metal (Ti and Ni) embedded films using a radio frequency plasma-enhanced chemical vapor deposition system. The microstructure of CNTs grown on the dual metal films proved to be heavily dependent on the percentages of metals included, varying both in size and in density. Electron emission tests carried out on the films with CNTs grown showed that the threshold field was dependent on the surface morphology of the CNTs, with the lowest threshold field at 3.5 V/μm from 2.5% Ti/Ni film with CNTs. The field enhancement factor, β, of the emitting tips was also calculated from the Fowler-Nordheim plots, where CNTs from the 2.5% Ti/Ni film gave the highest field enhancement factor. However, it was observed that films with a single metal of either Ti or Ni did not manage to grow CNTs, possibly due to a lack of catalyst centres at the surface of the films. It was believed that the Ni nanoclusters acted as catalysts centres giving a rather uniform but randomly orientated type of CNTs. Results obtained pointed that the fabricated nanocomposite material could be a possible choice for cold cathode emitters and the Ti/Ni mixture could be an effective composite for controlling the CNT density. © 2009 Elsevier B.V. All rights reserved.
Source Title: Applied Surface Science
URI: http://scholarbank.nus.edu.sg/handle/10635/64861
ISSN: 01694332
DOI: 10.1016/j.apsusc.2009.07.111
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