Abstract
Nanoporous palladium nickel (np-PdNi) was produced by dealloying PdNi alloy thin films. The pore and ligament dimensions were reduced by 50% when surfactants were added to the sulfuric acid etching solution. Changes in film composition and biaxial film stress were used to track the dealloying evolution in the surfactant-modified etching solution. Ultrasonic agitation was also used to enhance dealloying and shortened the required time from 5 h to 1 h, while retaining a pore/ligament size of ∼5 nm.
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