Low-level detection of ethanol and H2S with temperature-modulated WO3 nanoparticle gas sensors

被引:131
作者
Ionescu, R
Hoel, A
Granqvist, CG
Llobet, E
Heszler, P
机构
[1] Uppsala Univ, Dept Engn Sci, Angstrom Lab, SE-75121 Uppsala, Sweden
[2] Univ Rovira & Virgili, Dept Elect Elect & Automat Engn, ES-43007 Tarragona, Spain
[3] Univ Szeged, Hungarian Acad Sci, Res Grp Laser Phys, H-6701 Szeged, Hungary
关键词
WO3; nanoparticle; gas sensor; ethanol; H2S; fast Fourier transform; wavelet analysis; pattern recognition;
D O I
10.1016/j.snb.2004.05.015
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Low-level detection of ethanol and H2S was achieved with thermally modulated WO3 nanoparticle gas sensors. Nanoparticle WO3 films, with a mean grain size of similar to5 run and a thickness of similar to20 mum, were produced by advanced reactive gas evaporation onto alumina substrates. The working temperature of the sensor was periodically modulated between 150 and 250 degreesC, and the response was analysed by fast Fourier transform (FFT) and discrete wavelet transform (DWT) methods in order to extract characteristic parameters from the sensors' response transients. After calibration of the sensor for low concentrations of ethanol and H2S, it was possible to detect as little as 200 ppb of ethanol and 20 ppb of H2S (both of them dry gases) with good accuracy. Long-term sensor behaviour was assessed. Unsupervised and supervised linear pattern recognition methods, specifically principal component analysis (PCA) and discriminant factor analysis (DFA), were successfully applied to distinguish the investigated gases. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:132 / 139
页数:8
相关论文
共 36 条
  • [1] ADVANI GN, 1983, Patent No. 4399684
  • [2] TUNGSTEN OXIDE-BASED SEMICONDUCTOR SENSOR HIGHLY SENSITIVE TO NO AND NO2
    AKIYAMA, M
    TAMAKI, J
    MIURA, N
    YAMAZOE, N
    [J]. CHEMISTRY LETTERS, 1991, (09) : 1611 - 1614
  • [3] Brereton R. G., 1990, Chemometrics-applications of mathematics and statistics to laboratory systems
  • [4] Optimized temperature-pulse sequences for the enhancement of chemically specific response patterns from micro-hotplate gas sensors
    Cavicchi, RE
    Suehle, JS
    Kreider, KG
    Gaitan, M
    Chaparala, P
    [J]. SENSORS AND ACTUATORS B-CHEMICAL, 1996, 33 (1-3) : 142 - 146
  • [5] Sensors for detecting sub-ppm NO2 using photochemically produced amorphous tungsten oxide
    Chu, CW
    Deen, MJ
    Hill, RH
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1998, 145 (12) : 4219 - 4225
  • [6] ORTHONORMAL BASES OF COMPACTLY SUPPORTED WAVELETS
    DAUBECHIES, I
    [J]. COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS, 1988, 41 (07) : 909 - 996
  • [7] Gas identification by modulating temperatures of SnO2-based thick film sensors
    Heilig, A
    Barsan, N
    Weimar, U
    Schweizer-Berberich, M
    Gardner, JW
    Gopel, W
    [J]. SENSORS AND ACTUATORS B-CHEMICAL, 1997, 43 (1-3) : 45 - 51
  • [8] Hoel A, 2000, MATER RES SOC SYMP P, V581, P15
  • [9] DEVELOPMENT OF A THICK-FILM AMMONIA SENSOR FOR LIVESTOCK BUILDINGS
    HUYBERECHTS, G
    VANMUYLDER, M
    HONORE, M
    DESMET, J
    ROGGEN, J
    [J]. SENSORS AND ACTUATORS B-CHEMICAL, 1994, 18 (1-3) : 296 - 299
  • [10] Wavelet transform-based fast feature extraction from temperature modulated semiconductor gas sensors
    Ionescu, R
    Llobet, E
    [J]. SENSORS AND ACTUATORS B-CHEMICAL, 2002, 81 (2-3) : 289 - 295