Detection of chlorinated methanes by tin oxide gas sensors

Tin oxide thin films prepared by thermal oxidation of Sn films were used for the detection of chlorinated methanes (CH2Cl2, CHCl3 and CCl4). This resulted in better chemical selectivity, sensitivity, response speed and detection limit than seen with previous detectors. The temperature dependence of...

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Bibliographic Details
Published in:Analyst (London) 2001-08, Vol.126 (8), p.1382-1386
Main Authors: SANG HYUN PARK, SON, Young-Chan, SHAW, Brenda R, CREASY, Kenneth E, SUIB, Steven L
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Chlorofluorocarbons, Methane - analysis
Chromatography, Gas - methods
Environmental Monitoring - methods
Environmental Pollutants - analysis
Exact sciences and technology
General, instrumentation
Sensitivity and Specificity
Temperature
Tin Compounds
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Summary:Tin oxide thin films prepared by thermal oxidation of Sn films were used for the detection of chlorinated methanes (CH2Cl2, CHCl3 and CCl4). This resulted in better chemical selectivity, sensitivity, response speed and detection limit than seen with previous detectors. The temperature dependence of the sensing of 1% CCl4 gas was studied and the best sensing behavior was observed at 300 degrees C. The films showed different chemical selectivity in both speed and direction of sensing response to each gas and were stable for more than 3 weeks under operating conditions. The films showed rapid gas sensing (
ISSN:0003-2654
1364-5528
DOI:10.1039/b006011i