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Abstract
We propose a technique for producing freestanding films having a wrinkled structure. In an experiment, we discovered that a wrinkle pattern can be made on the surface of a sacrificial resin layer by applying compressive strain under the appropriate conditions. Using this phenomenon, we made a freestanding wrinkled film by depositing a film on the wrinkled resin surface and then removing the resin layer with an organic solvent. Uniaxial tensile tests for 300 nm thick freestanding copper wrinkled films revealed that the films have superior deformability: the fracture elongation is more than ten times larger than that of its straight film counterpart.
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