Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Characteristics of a Metal-loaded SnO2/WO3 Thick Film Gas Sensor for Detecting Acetaldehyde Gas

  • Jun, Jae-Mok (Department of Chemistry, Keimyung University) ;
  • Park, Young-Ho (Department of Pharmaceutical Engineering, International University of Korea) ;
  • Lee, Chang-Seop (Department of Chemistry, Keimyung University)
  • Received : 2011.03.16
  • Accepted : 2011.04.06
  • Published : 2011.06.20
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Abstract

This study investigates the sensitivity of a gas sensor to volatile organic compounds (VOCs) at various operating temperatures and catalysts. Nano-sized powdered $WO_3$ prepared by sol-gel and chemical precipitation methods was mixed with various metal oxides. Next, transition metals (Pt, Ru, Pd, and In) were doped on the surface of the mixture. Metal-$WO_3$ thick films were prepared using the screen-printing method. The physical and chemical properties of the films were studied by SEM/EDS, XRD, and BET techniques. The measured sensitivity to VOCs is defined as the ratio ($R_a/R_g$) of resistance ($R_{air}$) of $WO_3$ film in the air to resistance ($R_{gas}$) of $WO_3$ film in a VOCs test gas. The sensitivity and selectivity of the films were tested with various VOCs such as acetaldehyde, formaldehyde, methyl alcohol, and BTEX. The thick $WO_3$ film containing 1 wt % of Ru and 5 wt % of $SnO_2$ showed the best sensitivity and selectivity to acetaldehyde gas at an operating temperature of 300 $^{\circ}C$.

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