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Oxygen plasma assisted end-opening and field emission enhancement in vertically aligned multiwall carbon nanotubes

Mathur, A, Roy, SS., Hazra, KS, Wadhwa, S, Ray, SC, Mitra, SK, Misra, DS and McLaughlin, JAD (2012) Oxygen plasma assisted end-opening and field emission enhancement in vertically aligned multiwall carbon nanotubes. Materials Chemistry and Physics, 134 (1). p. 425. [Journal article]

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URL: http://dx.doi.org/10.1016/j.matchemphys.2012.03.012

DOI: doi:10.1016/j.matchemphys.2012.03.012

Abstract

This paper highlights the changes in micro-structural and field emission properties of vertically aligned carbon nanotubes (VACNTs) via oxygen plasma treatment. We find that exposure of very low power oxygen plasma (6 W) at 13.56 MHz for 15-20 min, opens the tip of vertically aligned CNTs. Scanning electron microscopy and transmission electron microscopy images were used to identify the quality and micro-structural changes of the nanotube morphology and surfaces. Raman spectra showed that the numbers of defects were increased throughout the oxygen plasma treatment process. In addition, the hydrophobic nature of the VACNTs is altered significantly and the contact angle decreases drastically from 110°to 40°. It was observed that the electron field emission (EFE) characteristics are significantly enhanced. The turn-on electric field (ETOE) of CNTs decreased from ?0.80 V ?m -1 (untreated) to ?0.60 V ?m -1 (oxygen treated). We believe that the open ended VACNTs would be immensely valuable for applications such as micro/nanofluidic based filtering elements and display devices. © 2012 Elsevier B.V. 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:28356
Deposited By: Mrs Ann Blair
Deposited On:14 Jan 2014 07:00
Last Modified:14 Jan 2014 07:00

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