Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 185, Issue -, Pages 39-46Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.04.080
Keywords
Polypyrrole; Polyaniline; Acetone; Conductimetric gas sensor; Sensitivity
Funding
- National Science Council of the Republic of China [NSC 101-2221-E-167-027-MY3]
- National Chin-Yi University of Technology
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Polypyrrole (PPy) and polyaniline (PANi) synthesized onto the Au/Al2O3 by chemical oxidation-casting (COC), chemical vapor deposition (CVD) and impregnated oxidation (IO) techniques are employed to monitor the level of acetone in gas phase. With PPy prepared by CVD (PPy(CVD)) as the sensing material, the sensitivity of acetone gas sensor is found to be 5.20 x 10(-7) ppm(-1). The sensitivity of acetone gas sensor based on PANi is greater than that of PPy. The maximum sensitivity and minimum response time are obtained for PANi prepared by IO technique. With PANi(IO)/Au/Al2O3 as the sensing electrode, the sensitivity, response and recovery times of acetone gas sensor are 5.908 x 10(-4) ppm(-1), 1.0-3.0 and 3.0-10.0 min, respectively. The detection limit of acetone gas sensor based on PANi(IO) is 29 ppm. (C) 2013 Elsevier B.V. All rights reserved.
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