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Effects of O2plasma and UV-O3assisted surface activation on high sensitivity metal oxide functionalized multiwalled carbon nanotube CH4sensors

  • Author(s): Humayun, MT
  • Sainato, M
  • Divan, R
  • Rosenberg, RA
  • Sahagun, A
  • Gundel, L
  • Solomon, PA
  • Paprotny, I
  • et al.

Published Web Location

https://doi.org/10.1116/1.4993579Creative Commons Attribution-ShareAlike 4.0 International Public License
Abstract

© 2017 American Vacuum Society. The authors present a comparative analysis of ultraviolet-O3(UVO) and O2plasma-based surface activation processes of multiwalled carbon nanotubes (MWCNTs), enabling highly effective functionalization with metal oxide nanocrystals (MONCs). Experimental results from transmission electron microscopy, scanning electron microscopy, x-ray photoelectron spectroscopy, and Raman spectroscopy show that by forming COOH (carboxyl), C-OH (hydroxyl), and C=O (carbonyl) groups on the MWCNT surface that act as active nucleation sites, O2plasma and UVO-based dry pretreatment techniques greatly enhance the affinity between the MWCNT surface and the functionalizing MONCs. MONCs, such as ZnO and SnO2, deposited by the atomic layer deposition technique, were implemented as the functionalizing material following UVO and O2plasma activation of MWCNTs. A comparative study on the relative resistance changes of O2plasma and UVO activated MWCNT functionalized with MONC in the presence of 10 ppm methane (CH4) in air is presented as well.

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