Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Hydrogen Gas Sensing of Co3O4-Decorated WO3 Nanowires

  • Park, Sunghoon (Department of Materials science and Engineering, Inha University) ;
  • Sun, Gun-Joo (Department of Materials science and Engineering, Inha University) ;
  • Kheel, Hyejoon (Department of Materials science and Engineering, Inha University) ;
  • Hyun, Soong Keun (Department of Materials science and Engineering, Inha University) ;
  • Jin, Changhyun (School of Mechanical Engineering, Konkuk University) ;
  • Lee, Chongmu (Department of Materials science and Engineering, Inha University)
  • Received : 2015.07.20
  • Accepted : 2015.09.17
  • Published : 2016.01.20
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Abstract

$Co_3O_4$ nanoparticle-decorated $WO_3$ nanowires were synthesized by the thermal oxidation of powders followed by a solvothermal process for $Co_3O_4$ decoration. The $Co_3O_4$ nanoparticle-decorated $WO_3$ nanowire sensor exhibited a stronger and faster electrical response to $H_2$ gas at $300^{\circ}C$ than the pristine $WO_3$ nanowire counterpart. The former showed faster response and recovery than the latter. The pristine and $Co_3O_4$-decorated $WO_3$ nanowire sensors showed the strongest response to $H_2$ gas at 225 and $200^{\circ}C$, respectively. The $Co_3O_4$-decorated $WO_3$ nanowire sensor showed selectivity for $H_2$ gas over other reducing gases. The enhanced sensing performance of the $Co_3O_4$-decorated $WO_3$ nanowire sensor was explained by a combination of mechanisms: modulation of the depletion layer width forming at the $Co_3O_4-WO_3$ interface, modulation of the potential barrier height forming at the interface, high catalytic activity of $Co_3O_4$ for the oxidation of $H_2$, active adsorption of oxygen by the $Co_3O_4$ nanoparticle surface, and creation of more active adsorption sites by $Co_3O_4$ nanoparticles.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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