Synthesis of Nanoporous Gold Tubes

Abstract

Hierarchical materials with tailored features provide promising structures for applications requiring light-weight, yet strong, materials. In this study, a method for synthesizing nanoporous gold tubes as a hierarchical structure is presented. Samples are fabricated via electrodeposition, homogenization, and dealloying to generate a random porous network in the tube wall. Electrodeposition parameters are optimized by using a reverse pulse current setup. As-prepared tubes exhibit a ligament diameter of approximately 45 nm and the hierarchy of the tubes is further altered by controlling the ligament size through heat treatments.

Nanoporous Metals with Structural Hierarchy: A Review

“…Both stochastic and periodic materials can be fabricated with a wide variety of base metals, from aluminum to titanium, and with closed or open porosity. [68,74,85] respectively. For instance, the latter implies permeability to fluids, typically along with a lower density.…”

“…[85] The processing steps for this method are shown in Figure 4. [85] The processing steps for this method are shown in Figure 4.…”

“…m, l, and c & d) reproduced with permission from ref. [68,74,85] respectively. Copyright 2011Copyright , 2006Copyright , 2015, John Wiley and Sons.…”

“…This type of templating and homogenization of the structures was expanded upon in a study by Juarez and Hodge, where the overall higher order structure was in the form of hollow tubes approaching the centimeter length scale in the largest dimension. [85] The processing steps for this method are shown in Figure 4. First, a hollow Au tube is coated with Ag followed by a heat treatment to form the alloy.…”