Abstract
The morphology and microstructure parameters of nanoporous gold (NPG) during thermal coarsening were investigated by automatic thresholding and image recognition algorithms. The ligaments width distributions, pore width distributions and curvature distributions are determined to quantitatively characterize microstructure of NPG. The results show a clear temperature dependence of these parameters. The measured activation energy (∼100 kJ/mol) for coarsening process supports the surface diffusion mechanism during ligaments coarsening of NPG. It was also found that the ligament and pore size are topological equivalent. Because of the dangling ligaments formed by pinch-off process have convex curvature, the ratio of positive curvature is higher than that of negative curvature. This structural geometry and microstructure characteristics analysis of NPG could help researchers better understanding the structure evolution, physical and chemical properties.
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