Substrate Topography Guides Pore Morphology Evolution in Nanoporous Gold Thin Films.
- Author(s): Chapman, Christopher AR
- Daggumati, Pallavi
- Gott, Shannon C
- Rao, Masaru P
- Seker, Erkin
- et al.
Published Web Locationhttps://doi.org/10.1016/j.scriptamat.2015.07.039
This paper illustrates the effect of substrate topography on morphology evolution in nanoporous gold (np-Au) thin films. One micron-high silicon ridges with widths varying between 150 nm to 50 µm were fabricated and coated with 500 nm-thick np-Au films obtained by dealloying sputtered gold-silver alloy films. Analysis of scanning electron micrographs of the np-Au films following dealloying and thermal annealing revealed two distinct regimes where the ratio of film thickness to ridge width determines the morphological evolution of np-Au films.