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Single-walled carbon nanotube networks for ethanol vapor sensing applications |
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| Authors: | Ilya V. Anoshkin Albert G. Nasibulin Prasantha R. Mudimela Maoshuai He Vladimir Ermolov Esko I. Kauppinen | |
| Affiliation: | 1. Department of Applied Physics, Aalto University School of Science, P.O. Box 15100, Espoo, FI-00076, AALTO, Finland 2. Research Center in Physics of Matter and Radiation (PMR), University of Namur (FUNDP), rue de Bruxelles 61, B-5000, Namur, Belgium 3. Department of Biotechnology and Chemical Technology, Aalto University, School of Chemical Technology, P.O. Box 16100, FI-00076, Aalto, Finland 4. Nokia Research Center, Helsinki, Finland |
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| Abstract: | 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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