Skip to main content
padlock icon - secure page this page is secure

Ultrathin Films of Single-Walled Carbon Nanotubes: A Potential Methane Gas Sensor

Buy Article:

$105.00 + tax (Refund Policy)

Due to unique electrical, mechanical and optical properties of carbon nanotubes (CNTs), they find huge industrial application. For some device applications, CNTs need preferential alignment onto the solid substrates. Here we demonstrate a control over alignment of bundles of single-walled carbon nanotubes (SWCNTs) during the ultrathin film fabrication on the solid substrates by Langmuir–Blodgett (LB) technique. During the LB film deposition process, the long axis of the SWCNTs are made to align either parallel or perpendicular to the direction of the electric field applied by a patterned interdigitated electrode (IDE). The current–voltage characterization of such films indicated a strong evidence of the parallel and perpendicular alignments of the SWCNTs between the IDE. The LB film of SWCNTs on the oxidized silicon substrate is employed to sense the methane (CH4) gas in dry and humid environments at the room temperature. The sensing capability of highly organized SWCNTs in the LB films is compared with that of randomly oriented SWCNTs in the drop cast film. The LB films of the SWCNTs show a step like response (contact potential difference) due to a change in the concentration of the CH4 gas molecules. Interestingly, the sensitivity in the humid condition was found to be significantly larger as compared to that in dry environment. The enhanced capability of LB film for sensing CH4 gas can be attributed to the aligned SWCNTs which may provide aligned adsorption sites for the gas molecules.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics


Document Type: Research Article

Publication date: 01 March 2015

More about this publication?
  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more