Neutralized fluorine radical detection using single-walled carbon nanotube network |
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Authors: | Sehun Jung Byoungjae Park Youngjin Kim Geunyoung Yeom Seunghyun Baik |
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Affiliation: | a School of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea b SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Republic of Korea c Department of Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea |
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Abstract: | It is known that single-walled carbon nanotubes (SWCNTs) can be functionalized by fluorine gas. Here, we report neutralized fluorine radical detection using a matted sheet of SWCNTs, prepared by alternating current dielectrophoresis. Upon exposure to neutralized radicals containing fluorine atoms in a plasma, as model analytes, the conductance of the SWCNT matt showed fast modulation. The transduction mechanism was investigated by electrical transport measurements, X-ray photoelectron spectroscopy and Raman spectroscopy. Metallic nanotubes were shown to react covalently to the near exclusion of semiconducting species. The selectivity was promoted by the curvature-induced strain of the nanotubes. The results open new opportunities for the detection of fluorine radicals at specific locations inside the reaction zone using a simple, miniaturized carbon nanotube network. |
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