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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.
Abstract

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.

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