Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Selective NO2 Sensors Using MoS2-MoO2 Composite Yolk-shell Spheres

  • Jeong, Seong Yong (Department of Materials Science and Engineering, Korea University) ;
  • Choi, Seung Ho (Department of Materials Science and Engineering, Korea University) ;
  • Yoon, Ji-Wook (Department of Materials Science and Engineering, Korea University) ;
  • Won, Jong Min (Department of Materials Science and Engineering, Korea University) ;
  • Kang, Yun Chan (Department of Materials Science and Engineering, Korea University) ;
  • Park, Joon-Shik (Smart Convergence Sensor Research Center, Korea Electronic Technology Institute (KETI)) ;
  • Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
  • Received : 2015.05.05
  • Accepted : 2015.05.26
  • Published : 2015.05.31
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Abstract

The gas sensing characteristic of $MoS_2-MoO_2$ composite yolk-shell spheres were investigated. $MoO_3$-carbon composite spheres were prepared by ultrasonic spray pyrolysis of aqueous droplets containing Mo-source and sucrose in nitrogen, which were converted into $MoO_3$ yolk-shell spheres by heat treatment at $400^{\circ}C$ in air. Subsequently, $MoS_2-MoO_2$ composite yolk-shell spheres were prepared by the partial sulfidation of $MoO_3$. The $MoS_2-MoO_2$ composite yolk-shell spheres showed relatively low and irreversible gas sensing characteristics at < $200^{\circ}C$. In contrast, the sensor showed high and reversible response (S=resistance ratio) to 5 ppm $NO_2$ (S=14.8) at $250^{\circ}C$ with low cross-responses (S=1.17-2.13) to other interference gases such as ethanol, CO, xylene, toluene, trimethylamine, $NH_3$, $H_2$, and HCHO. The $MoS_2-MoO_2$ composite yolk-shell spheres can be used as reliable sensors to detect $NO_2$ in a selective manner.

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References

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