Nanoporous Pd (np-Pd) was prepared by co-sputtering Pd-Ni alloy films onto Si substrates, followed by chemical dealloying with sulfuric acid. X-ray diffractometry and chemical analysis were used to track the extent of dealloying. The np-Pd structure was changed from particle-like to sponge-like by diluting the sulfuric acid etchant. Using suitable precursor alloy composition and dealloying conditions, np-Pd films were prepared with uniform and open sponge-like structures, with interconnected ligaments and no cracks, yielding a large amount of surface area for reactions with hydrogen. Np-Pd films exhibited shorter response time for hydrogen absorption/desorption than dense Pd films, showing promise for hydrogen sensing.
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This material is based upon work supported by the National Science Foundation under Grant No. DMR-0847693. Acknowledgment is made to the Donors of the American Chemical Society Petroleum Research Fund (Grant No. 43324-G10), for support of this research.
Li, Wen-Chung and Balk, Thomas John, "Preparation and Hydrogen Absorption/Desorption of Nanoporous Palladium Thin Films" (2009). Chemical and Materials Engineering Faculty Publications. 22.