Metallurgical and Materials Transactions A

, Volume 39, Issue 11, pp 2656–2665

Evolution of Structure, Composition, and Stress in Nanoporous Gold Thin Films with Grain-Boundary Cracks


DOI: 10.1007/s11661-008-9625-z

Cite this article as:
Sun, Y. & Balk, T.J. Metall and Mat Trans A (2008) 39: 2656. doi:10.1007/s11661-008-9625-z


Nanoporous gold (np-Au) thin films were fabricated from Au-Ag alloy films sputtered onto substrates. At several stages of dealloying, the evolution of the microstructure and Ag content were analyzed and stress in the np-Au thin films was measured. A nanoporous structure evolved almost immediately throughout the film thickness, and the ligament width coarsened during further dealloying, with a time dependence of t1/8. The initial alloy films, which contained 25 at. pct Au, became stress free after extended dealloying and during thermal cycling up to 200 °C. Preferential dissolution caused cracking at grain boundaries, which accommodated a portion of the volume contraction from dealloying, but the films nonetheless remained attached to their substrates.

Copyright information

© The Minerals, Metals & Materials Society and ASM International 2008

Authors and Affiliations

  1. 1.Department of Chemical and Materials EngineeringUniversity of KentuckyLexingtonUSA