Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

Hysteresis Behavior in Electric Resistance-hydrogen Concentration of Pd Thin Films

Pd 박막의 전기저항-수소농도 이력현상

  • Lee, Eunsongyi (Department of Materials Science and Engineering, Yonsei University) ;
  • Lee, Jun Min (Department of Materials Science and Engineering, Yonsei University) ;
  • Jeon, Kye Jin (Department of Materials Science and Engineering, Yonsei University) ;
  • Lee, Wooyoung (Department of Materials Science and Engineering, Yonsei University)
  • Received : 2008.12.22
  • Published : 2009.06.25
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Abstract

We report on hysteresis behavior in the electrical resistance-hydrogen concentration of Pd thin films. The variation of the electrical resistance has been investigated during the process of absorption and desorption of hydrogen gas ($H_{2}$) as a function of thickness of Pd thin films. The hysteresis behavior in the electrical resistance with $H_{2}$ concentration was found for Pd thin films and consists of $\alpha$ phase, ${\alpha}+{\beta}$ phase, and $\beta$ phase regions. The sensitivity of Pd thin films with $H_{2}$ concentration was found to follow Sieverts' law in the $\alpha$ phase region. However, the sensitivity was observed to increase abruptly with $H_{2}$ concentration in the ${\alpha}+{\beta}$ phase co-exist region. This is because Pd-H interaction is stronger in the $\beta$ phase than in the $\alpha$ phase and needs a higher concentration gradient as a driving force to desorb. The formation of the $\beta$ phase also was observed to cause the structural change because of the lattice expansion during absorption. The hysteresis height and the trace of structural change were affected by the thickness of the Pd film. As the film becomes thinner, the hysteresis height becomes lower and the amount of delamination on the surface becomes smaller. For films thinner than 20 nm in thickness, the delamination was not found but electrical resistance hysteresis was still observed.

Keywords

Acknowledgement

Supported by : 과학재단, 서울시

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