Formation of Nanoporous Gold by Chemical Dealloying of an AlAu Intermetallic Compound
Here, we report the synthesis of nanoporous gold (NPG) with a uniform structure by chemical dealloying of an AlAu intermetallic compound under free corrosion conditions. The length scales of ligaments/channels in NPG can be tuned by changing the dealloying solution. We verify that Cl- can accelerate the surface diffusion of Au atoms and induce the coarsening of ligaments/channels in NPG. In addition, a metastable intermediate Al2Au5 phase appears during the dealloying of AlAu.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
J. K. Lin and Z. H. Zhang, "Formation of Nanoporous Gold by Chemical Dealloying of an AlAu Intermetallic Compound", Advanced Materials Research, Vols. 236-238, pp. 2092-2096, 2011