MULTIMODE WRINKLING PATTERNS OF IRON FILMS SPUTTER DEPOSITED ON FLEXIBLE SUBSTRATES WITH GRADIENT MODULUS

Yongju Zhang (), Pinggen Cai, Li Zhang and Senjiang Yu
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Yongju Zhang: College of Mechanical Engineering, Taizhou University, Jiaojiang 318000, P. R. China
Pinggen Cai: #x2020;Department of Applied Physics, College of Science, Zhejiang University of Technology, Hangzhou 310023, P. R. China
Li Zhang: College of Mechanical Engineering, Taizhou University, Jiaojiang 318000, P. R. China
Senjiang Yu: #x2021;Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Advanced Magnetic Materials, Hangzhou Dianzi University, Hangzhou 310018, P. R. China

Surface Review and Letters (SRL), 2021, vol. 28, issue 05, 1-10

Abstract: Wrinkling patterns are beneficial for a wide range of engineering applications including flexible electronics, tuned optics, sensoring, energy harvesting, surface wetting and biomedicine. Here we report on controllable multimode wrinkling patterns of metal (iron) films sputter deposited on flexible substrates with gradient modulus. It is found that disordered wrinkles (G1 wrinkling) form in the weakly crosslinking region at the early stage of film deposition. Disordered labyrinth wrinkles with larger wavelengths and ordered stripe wrinkles localized by cracks (both G2 wrinkling) appear in the strongly crosslinking region for the samples with small film thickness and large thickness, respectively. The coexistence of the labyrinth G1 wrinkling and labyrinth G2 wrinkling (or stripe G2 wrinkling) can be obtained by tuning the substrate modulus and film thickness. The morphologies, evolutions and mechanisms of such wrinkles are discussed in detail based on the stress theory. This study can promote better understanding of the substrate effect on the complex wrinkling patterns.

Keywords: Thin film; wrinkling; PDMS; gradient modulus; sputtering (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X21500359

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