Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Al Doping Effect of Pd/TiO2 for Improved Hydrogen Detection

수소 감지 성능 향상을 위한 Pd/TiO2 분말에서의 Al 도핑 효과

  • Lee, Yeongan (Department of Materials Science & Engineering and Department of Energy Systems Research, Ajou University) ;
  • Seo, Hyungtak (Department of Materials Science & Engineering and Department of Energy Systems Research, Ajou University)
  • 이영안 (아주대학교 신소재공학과/에너지시스템학과) ;
  • 서형탁 (아주대학교 신소재공학과/에너지시스템학과)
  • Received : 2014.05.14
  • Accepted : 2014.05.30
  • Published : 2014.05.31
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Abstract

$TiO_2$ oxide semiconductor is being widely studied in various applications such as photocatalyst and photosensor. Pd/$TiO_2$ gas sensor is mainly used to detect $H_2$, CO and ethanol. This study focus on increasing hydrogen detection ability of Pd/$TiO_2$ in room temperature through Al-doping. Pd/$TiO_2$ was fabricated by the hydrothermal method. Contacting to Aluminum (Al) foil led to Al doping effect in Pd/$TiO_2$ by thermal diffusion and enhanced hydrogen sensing response. $TiO_2$ nanoparticles were sized at ~30 nm of diameter from scanning electron microscope (SEM) and maintained anatase crystal structure after Al doping from X-ray diffraction analysis. Presence of Al in $TiO_2$ was confirmed by X-ray photoelectron spectroscopy at 73 eV. SEM-energy dispersive spectroscopy measurement also confirmed 2 wt% Al in Pd/$TiO_2$ bulk. The gas sensing test was performed with $O_2$, $N_2$ and $H_2$ gas ambient. Pd/Al-doped $TiO_2$ did not response $O_2$ and $N_2$ gas in vacuum except $H_2$. Finally, the normalized resistance ratio ($R_{H2on}/R_{H2off}$) of Pd/Al-doped $TiO_2$ increases about 80% compared to Pd/$TiO_2$.

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References

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