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Hybrid multiwalled carbon nanotubes and trioxide tungsten nanoparticles for hydrogen gas sensing

Ghasempour, R ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1088/0022-3727/42/16/165105
  3. Publisher: 2009
  4. Abstract:
  5. The WO3/multiwalled carbon nanotubes (MWNTs) hybrid films were fabricated by spin-coating on an alumina substrate. The structure, morphology, chemical composition and quality of the as-prepared WO3 nanoparticles, functionalized MWNTs and WO3/MWNTs hybrid films were studied by SEM, TEM, XRD, XPS, DLS and Raman spectroscopy methods. Results show that WO3 nanoparticles were nucleated on oxygenated functionalized MWNTs in hybrid suspension. After coating and annealing the films at 350 °C, the hybrid WO3/MWNTs films present rather linear gas sensitivity as a function of hydrogen concentrations at 300 °C. Results are discussed based on surface increase as well as development of two types of Schottky potential barrier height, one at the n-WO3/p-MWNTs hetero-junction and the other at WO3 grain boundaries. © 2009 IOP Publishing Ltd
  6. Keywords:
  7. Alumina substrates ; Chemical compositions ; Functionalized ; Gas sensitivity ; Hybrid film ; Hybrid suspension ; Hydrogen concentration ; Hydrogen gas sensing ; Potential barrier height ; Schottky ; SEM ; TEM ; XPS ; XRD ; Carbon films ; Carbon nanotubes ; Coatings ; Grain boundaries ; Hydrogen ; Multiwalled carbon nanotubes (MWCN) ; Nanoparticles ; Raman spectroscopy ; Spectroscopic analysis ; Tungsten ; Gas permeable membranes
  8. Source: Journal of Physics D: Applied Physics ; Volume 42, Issue 16 , 2009 ; 00223727 (ISSN)
  9. URL: https://iopscience.iop.org/article/10.1088/0022-3727/42/16/165105