Journal
NANO RESEARCH
Volume 6, Issue 2, Pages 77-86Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-012-0282-6
Keywords
single walled carbon nanotubes; carbon nanobuds; Ar-plasma; ethanol vapor sensor
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Funding
- NanoSystem project
- Nokia research center, Academy of Finland
- Finnish Funding Agency for Technology and Innovation (TEKES) [LIBACAM 211247]
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Networks of pristine high quality single walled carbon nanotubes (SWNTs), the SWNTs after Ar-plasma treatment (from 2 to 12 min) and carbon nanobuds (CNBs) have been tested for ethanol vapor sensing. It was found that the pristine high quality SWNTs do not exhibit any ethanol sensitivity, while the introduction of defects in the tubes results in the appearance of the ethanol sensitivity. The CNB network showed ethanol sensitivity without plasma treatment. Both CNB and low defect (after 3 min treatment) SWNT networks exhibit significant drift in the resistance baseline, while heavily plasma-treated (9 min) SWNTs exhibited high ethanol vapor sensitivity without the baseline change. The mechanisms of the ethanol sensitivity and stability after the plasma irradiation are attributed to the formation of sensitive dangling bonds in the SWNTs and formation of defect channels facilitating access of the ethanol vapor to all parts of the bundled nanotubes.
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