Abstract
Single-walled carbon nanotube (SWNT) films were prepared on interdigitated electrodes by airbrush technique, and their sensing properties to dimethyl methylphosphonate (DMMP) were studied. The SWNT films were characterized by field-emission scanning electron microscope. The response to different concentrations of DMMP vapors were investigated at room temperature. The results showed that the capacitance of airbrush SWNT sensor decreased rapidly in varying concentrations ranging from 12 to 60 mg/m3 (2.4–12 ppm). The capacitance sensitivity was about 12.5 % when exposed to 12 mg/m3 DMMP vapor. The capacitance sensitivity was higher when the initial capacitance and loss tangent were higher and the SWNT film was denser. It was found that the capacitance sensitivity was nearly 10 times to the resistance sensitivity. The airbrush SWNT sensor exhibited highly and fast capacitance response, good repeatability and selectivity for DMMP vapor.
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This work was supported by the National Natural Science Foundation of China via Grant Nos. 60736005 and 60876050, the Foundation for Innovation Groups of NSFC via No. 61021061, and the Program for New Century Excellent Talents in University via Grant No. NCET-08-0086.
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Jing, H., Jiang, Y. & Du, X. Dimethyl methylphosphonate detection with a single-walled carbon nanotube capacitive sensor fabricated by airbrush technique. J Mater Sci: Mater Electron 24, 667–673 (2013). https://doi.org/10.1007/s10854-012-0789-3
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DOI: https://doi.org/10.1007/s10854-012-0789-3