Wetting phenomenon in nanoporous gold films

Erkin Seker, T. Tauer, J. Zhu, M. Begley, H. Bart-Smith, G. Zangari, R. G. Kelly, M. Utz, M. L. Reed

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We have fabricated nanoporous gold (np-Au) films on silicon wafers by dealloying films formed by simultaneous sputter deposition of gold and silver. We report an interesting wetting phenomenon observed after placing a droplet of liquid on the np-Au film surface. As a droplet was dispensed onto the surface, wetting equilibrium was quickly reached and a "wetting halo" appeared with its perimeter equidistant from the perimeter of the droplet. Non-porous gold control samples did not display such behavior. This phenomenon was systematically studied by dispensing liquid droplets with different surface tensions and then measuring the width of the wetting halo. It was observed that halo width increased with surface tension. Experiments were extended to observe the effects of film thickness and porosity on the halo width. The width increased as film thickness increased. The relationship between the width and porosity was inconclusive due to large data scatter.

Original languageEnglish (US)
Title of host publicationECS Trancsactions - Nanoporous Materials
Subtitle of host publicationChemistry and Applications
Number of pages7
StatePublished - Dec 1 2007
Externally publishedYes
EventNanoporous Materials: Chemistry and Applications - 211th ECS Meeting - Chicago, IL, United States
Duration: May 6 2007May 11 2007


OtherNanoporous Materials: Chemistry and Applications - 211th ECS Meeting
Country/TerritoryUnited States
CityChicago, IL

ASJC Scopus subject areas

  • Engineering(all)


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