Abstract
Pd-Ni nanoparticles have been fabricated by gas aggregation process. The formation of Pd-Ni nano-alloys was confirmed by X-ray photoelectron spectroscopy measurements. By depositing Pd-Ni nanoparticles on the interdigital electrodes, quantum conductance-based hydrogen sensors were fabricated. The Ni content in the nanoparticle showed an obvious effect on the hydrogen response behavior corresponding to the conductance change of the nanoparticle film. Three typical response regions with different conductance-hydrogen pressure correlations were observed. It was found that the α-β phase transition region of palladium hydride moves to significant higher hydrogen pressure with the addition of nickel element, which greatly enhance the hydrogen sensing performance of the nanoparticle film.
Highlights
In recent years, hydrogen has become an important new alternative energy source which can be used in various fields, including fuel cells, metallurgical, and electronic industries
The formation of Pd-Ni nano-alloys was confirmed by X-ray photoelectron spectroscopy measurements
Hydrogen sensor based on dense Pd-Ni alloy nanoparticle arrays deposited on interdigital electrodes has been demonstrated
Summary
Hydrogen has become an important new alternative energy source which can be used in various fields, including fuel cells, metallurgical, and electronic industries. Pd nanoparticle arrays have been used to fabricate highly selective sensors for the detection of hydrogen gas [2]-[4]. The phase transition from α phase of Pd to the “hydride” β phase occurs at fairly low hydrogen partial pressures, and this transition leads to irreversible structural changes in Pd[6, 7]. To improve these drawbacks, films of Pd-based alloys, such as Pd–Mg[8], Pd–Au[9], Pd–Ag[10], and Pd–Ni[11-13] alloys, have been investigated. We study the modification of the α to β-phase transition and hydrogen sensing behaviors of the Pd nanoparticles with nickel additions
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