Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Enhanced Gas Sensing Properties of Bi2O3-Core/In2O3-Shell Nanorod Gas Sensors

  • Park, Sung-Hoon (Department of Materials Science and Engineering, Inha University) ;
  • An, So-Yeon (Department of Materials Science and Engineering, Inha University) ;
  • Ko, Hyun-Sung (Department of Materials Science and Engineering, Inha University) ;
  • Jin, Chang-Hyun (Department of Materials Science and Engineering, Inha University) ;
  • Lee, Chong-Mu (Department of Materials Science and Engineering, Inha University)
  • Received : 2012.06.22
  • Accepted : 2012.07.20
  • Published : 2012.10.20
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Abstract

The $Bi_2O_3$ nanowires are highly sensitive to low concentrations of $NO_2$ in ambient air and are almost insensitive to most other common gases. However, it still remains a challenge to enhance their sensing performance and detection limit. This study examined the influence of the encapsulation of ${\beta}-Bi_2O_3$ nanorods with $In_2O_3$ on the $NO_2$ gas sensing properties. ${\beta}-Bi_2O_3-core/In_2O_3-shell$ nanorods were fabricated by a two-step process comprising the thermal evaporation of $Bi_2O_3$ powders and sputter-deposition of $In_2O_3$. Multiple networked ${\beta}-Bi_2O_3-core/In_2O_3-shell$ nanorod sensors showed the responses of 12-156% at 1-5 ppm $NO_2$ at $300^{\circ}C$. These response values were 1.3-2.7 times larger than those of bare ${\beta}-Bi_2O_3$ nanorod sensors at 1-5 ppm $NO_2$. The enhancement in the response of ${\beta}-Bi_2O_3$ nanorods to $NO_2$ gas by the encapsulation by $In_2O_3$ can be accounted for based on the space-charge model.

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