Vertically aligned carbon nanotube arrays for room temperature gas sensors

Suresh Rajaputra, Raghu Mangu, Ning Ma, Patricia Clore, Dali Qian, Rodney Andrews, Sovannary Phok, Janet Lumpp, Vijay Singh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


Vertically aligned multiwalled carbon nanotube (CNT) arrays were fabricated in anodized aluminum oxide (AAO) templates without the use of a catalyst, using xylene pyrolysis. The CNT arrays in AAO template were integrated into a resistive sensor design. The sensors were found to be highly responsive to NH3 and NO2 with steady state sensitivities of 5% and 10% for 100ppm of NH3 and NO2 respectively, at room temperature. Results were interpreted in terms of the CNTs acting as p-type semiconductors. A study was undertaken to elucidate the dependence of sensitivity on the thickness of the conducting amorphous carbon layers on top and bottom. Recovery of the MWNT gas sensor was studied for different types of desorption techniques. The thickness of the amorphous carbon layer (sheet resistance) was found to be critical in determining the sensor response.

Original languageEnglish
Title of host publicationNanotubes and Related Nanostructures
Number of pages7
StatePublished - 2008
Event2007 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 26 2007Nov 30 2007

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Conference2007 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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