薄膜与小尺度材料及力学性能研究组

Thermomechanical properties of gold nanowires supported on a flexible substrate
Pages 273-276
Sven Olliges, Stephan Frank, Patric A. Gruber, Vaida Auzelyte, Karsten Kunze, Harun H. Solak, Ralph Spolenak

Nanoindentation of single-crystalline gold thin films: Correlating hardness and the onset of plasticity

Marianne Dietiker^a, Ralph D. Nyilas^a, Christian Solenthaler^a and Ralph Spolenak^a

^aLaboratory for Nanometallurgy, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland

Received 22 December 2007; revised 9 April 2008; accepted 10 April 2008. Available online 22 May 2008.

Abstract

Understanding the mechanical properties of materials with external dimensions on the nanometer scale is crucial for the design and fabrication of nanoelectronics and nanosystems. Metal thin films exhibit a size-dependent hardening effect that scales inversely with the film thickness down to 200 nm. The thickness range below 200 nm is mostly unexplored and initial experiments indicate a change in the scaling law. Here, the mechanical properties of single-crystalline Au films are investigated in the thickness range from 31 to 858 nm by nanoindentation. Maximum shear stresses at the onset of plasticity are determined by the finite element method. While the hardness increases with decreasing film thickness, as expected from macroscopic experiments, the onset of plasticity shifts to lower shear stresses for thinner films. These observations are interpreted with respect to detailed observations of the microstructures of the films investigated.

Keywords: Gold thin films; Single crystal; Nanoindentation; Hardness; Plastic deformation

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