Nanoporous Gold Prism Microassembly through a Self-Organizing Route

Abstract

We report a simple and spontaneous synthesis of a nanoporous gold prism microassembly with highly dense skins, which is achieved just by immersing nanoporous gold into concentrated hydrochloric acid. The ligament size was coarsened to several hundred nanometers, but the crystal face orientation was still preserved. The same trends were seen in the case of coarsening by annealing; however, the morphology of the nanoporous gold prism microassembly was significantly different from the annealed nanoporous gold.

Preparation of nanoporous Ni and Ni–Cu by dealloying of rolled Ni–Mn and Ni–Cu–Mn alloys

“…The peak intensities for the (2 2 0) planes were strongest in the respective XRD patterns. The (2 2 0) orientation induced by the initial rolling of Ni-Mn and Ni-Cu-Mn alloys is likely to be maintained during dealloying [25]. The peak angles for nanoporous Ni-Cu were between those of pure Ni and Cu and increased with the Ni content, as clearly shown in Fig.…”

Using corrosion to fabricate various nanoporous metal structures

“…A proper post-treatment process on uniform np-Au can also be used for the fabrication of hierarchical nanostructure. For example, Hakamada and Mabuchi [111] reported that a np-Au prism microassembly with highly dense skins could be obtained by just immersing np-Au into concentrated HCl. Due to the original small cracks in the np-Au, the diffusion of the HCl solution, and greatly accelerated diffusivity of Au surface atoms (once contacted with Cl À ), hierarchical np-Au prism was spontaneously formed (Fig.…”

Nanoporous Gold Electrodes and Their Applications in Analytical Chemistry

“…A number of methods have been used to fabricate nanoporous gold in a variety of different forms including monoliths, nanowires, thin films, and ribbons [40][41][42], and most recently, nanoparticles [5] and nanoprisms [43]. Fabrication begins with an alloy of a defined composition and is followed by dealloying, either electrochemically or chemically, to remove the least noble constituent.…”