Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Highly Sensitive and Selective Ethanol Sensors Using Magnesium doped Indium Oxide Hollow Spheres

  • Jo, Young-Moo (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Chul-Soon (Department of Materials Science and Engineering, Korea University) ;
  • Wang, Rui (Department of Materials Science and Engineering, Korea University) ;
  • Park, Joon-Shik (Smart Sensor Research Center, Korea Electronic Technology Institute) ;
  • Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
  • Received : 2017.05.13
  • Accepted : 2017.06.05
  • Published : 2017.07.31
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Abstract

Pure $In_2O_3$, 0.5 and 1.0 wt% Mg doped $In_2O_3$ hollow spheres were synthesized by ultrasonic spray pyrolysis of a solution containing In-, Mg-nitrate and sucrose and their gas sensing characteristics to 5 ppm $C_2H_5OH$, p-xylene, toluene, and HCHO were measured at 250, 300 and $350^{\circ}C$. Although the addition of Mg decreases the specific surface area and the volume of meso-pores, the gas response (resistance ratio) of the 0.5 wt% Mg doped $In_2O_3$ hollow spheres to 5 ppm $C_2H_5OH$ at $350^{\circ}C$ (69.4) was significantly higher than that of the pure $In_2O_3$ hollow spheres (24.4). In addition, the Mg doped $In_2O_3$ hollow spheres showed the highest selectivity to $C_2H_5OH$. This was attributed to the dehydrogenation of $C_2H_5OH$ assisted by basic MgO into reactive $CH_3CHO$ and $H_2$.

Keywords

References

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