2019/12/30 by Maria Koifman Khristosov, Shiri Dishon, Khristosov, Maria Koifman +7
Materials Science · #Nanoporous metals and alloys #Nanocluster Synthesis and Applications #Supercapacitor Materials and Fabrication
paper · pdf · doi:10.48550/arxiv.2001.03496
Nanoporous gold is widely used in research and nanotechnology because of its\ndiverse properties, including high surface area and catalytic activity. The\nligament size is usually considered as the only parameter controlling thermal\nstability and mechanical properties of nanoporous gold. Recently we developed a\nmethod for creating nanoporous single crystal gold particles using eutectic\ndecomposition of Au-Ge, followed by selective etching of Ge. Here, we used this\nnovel method to create nanoporous gold particles with controlled ligament sizes\nby changing the initial sample relative concentrations of gold and germanium.\nWhen investigated from 1 to 4 hour at 250 to 400 degrees C the material was\nthermally stable up to 350 degrees C, which is higher than the thermal\nstability of classical nanoporous gold with similar ligament sizes prepared by\ndealloying. Mechanical properties were examined utilizing nanoindentation of\nnanoporous gold before and after annealing. For smaller ligament sizes,\nhardness increases with annealing temperature up to 300 degrees C and then\nstrongly decreases. For larger ligament sizes, hardness decreases with\nincreasing annealing temperature. Young modulus was unchanged up to 300 degrees\nC.\n