Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26471
Title: Analysis and improvement of cyclic stability of H2 sensing properties of Pd/Mg-Ni films
Authors: Tang, YM
Ong, CW 
Issue Date: 2011
Source: International journal of hydrogen energy, 2011, v. 36, no. 16, p. 10188-10196
Abstract: The nominal electrical resistivity of palladium coated magnesium-nickel (Pd/Mg-Ni) films was measured by exposing the films iteratively to hydrogen (H2) at a concentration of CH2 for hydrogenation and air for dehydrogenation. When a low CH2 was used, the film remained in an amorphous α-phase. H atoms interacted "interstitially" with the atomic network, and the H2 detection sensitivity S was relatively stable in the cyclic test. If higher CH2 values were used, the film was partially or completely transformed to an amorphous β-phase. Significant volumetric breathing occurred in the course, leading to severe roughening of the film and oxidation of the Mg-Ni layer. S became unstable. These suggestions are supported by the results of film thickness measurements, atomic force microscopy and X-ray photoelectron spectroscopy analyses. Stability of S of a Pd/Mg-Ni film can be greatly improved by either (i) operating the film in a low CH2 environment to prevent substantial volume breathing, or (ii) choosing an appropriate thickness of the Pd layer to optimize both oxidation resistance and sensing response of the film sensor.
Keywords: Cyclic stability
H2 sensing properties
Magnesium-nickel alloy films
Publisher: Pergamon Press
Journal: International journal of hydrogen energy 
ISSN: 0360-3199
EISSN: 1879-3487
DOI: 10.1016/j.ijhydene.2011.05.039
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