Hysteresis behavior of electrical resistance in Pd thin films during the process of absorption and desorption of hydrogen gas

Eunsongyi Lee, Jun Min Lee, Ja Hoon Koo, Wooyoung Lee, Taeyoon Lee

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

We report the fabrication of a novel hydrogen sensor that utilizes the electrical resistance changes in the palladium thin films with nanometer thicknesses. The sensing mechanism is based on transitory absorption of hydrogen atoms into the palladium layer, which leads to the reversible alteration of the electrical resistance. In concentrated hydrogen ambient, the excess hydrogen absorption process leads to mechanical deformation on the surface of the palladium films, corresponding to the phase transition from α-phase to β-phase. The reversible sensing process results in a hysteresis curve for resistive properties, of which the height (sensitivity) could be controlled by manipulating the thickness of the palladium layers. The peel-off phenomena on the surface of the palladium film were suppressed by decreasing the thickness of the film. At the thickness of 20 nm, a hysteresis curve of resistance was obtained without any structural change in the palladium thin film. These results provide a significant insight to the fundamental understanding of the relationship between the electrical sensitivity of pure Pd thin films and related structural deformation, which is essential to develop robust H-sensors with high sensibility.

Original languageEnglish
Pages (from-to)6984-6991
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume35
Issue number13
DOIs
Publication statusPublished - 2010 Jul

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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