IMPURITY INDUCED WRINKLING PATTERNS IN METAL FILMS DEPOSITED ON SOFT ELASTIC SUBSTRATES

Yong-Ju Zhang, Sen-Jiang Yu, Miao-Gen Chen, Ping-Gen Cai and Hong Zhou
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Yong-Ju Zhang: Department of Physics, Taizhou University, Linhai 317000, P. R. China
Sen-Jiang Yu: #x2020;Department of Physics, China Jiliang University, Hangzhou 310018, P. R. China
Miao-Gen Chen: #x2020;Department of Physics, China Jiliang University, Hangzhou 310018, P. R. China
Ping-Gen Cai: #x2021;Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310014, P. R. China
Hong Zhou: #x2020;Department of Physics, China Jiliang University, Hangzhou 310018, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 03, 1-7

Abstract: Metal (iron and nickel) films have been deposited on soft elastic polydimethylsiloxane (PDMS) substrates by direct current sputtering technique and the impurity induced wrinkling patterns are investigated by using optical microscopy and atomic force microscopy. It is found that the metal films can spontaneously form disordered wrinkles due to the isotropic compressive stress. In the vicinity of film impurities such as extraneous particles, linear defects, cracks and thickness-gradient film edges, the stress field becomes anisotropic owing to symmetry breaking and thus complex wrinkling patterns including straight stripes, herringbones, crossings, labyrinths and their transitions can be observed. The morphological evolutions, structural characteristics and physical mechanisms of the impurity induced wrinkles have been discussed and analyzed based on the continuum elastic theory.

Keywords: Metal film; elastic substrate; wrinkling; edge effect; internal stress (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500342

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