Abstract
This work examines mechanical properties of 50–300 nm gold thin films deposited onto micrometer-thick flexible polymer substrates by means of tensile testing of the film–substrate system and modeling. The film properties are extracted from mechanical testing of the film–substrate system and modeling of the bimaterial. Unlike materials in bulk geometry, the film elastic modulus and yield strength present an important dependence with film thickness, with modulus and yield strength of about 520 and 30 GPa, respectively, for the thinner films and decreasing toward the bulk value as the film thickness increases. The relation between grain size, film thickness, and yield strength is examined. Finite element analysis provides further insight into the stress distribution in the film–substrate system.
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Acknowledgements
This work was partially supported by CONACYT (Mexico) through project numbers F1-54173 and 79609. The authors deeply appreciate technical advice and know-how on polymer membrane (substrate) manufacturing by solution casting from Dr Manuel Aguilar and María Bastarrachea at CICY. The authors are also grateful to Alejandro May (CICY), Emilio Corona, and Oscar Ceh (CINVESTAV-Merida) for their technical support.
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L. Llanes—MS student at ITM, Merida, Mexico.
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Avilés, F., Llanes, L. & Oliva, A.I. Elasto-plastic properties of gold thin films deposited onto polymeric substrates. J Mater Sci 44, 2590–2598 (2009). https://doi.org/10.1007/s10853-009-3339-5
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DOI: https://doi.org/10.1007/s10853-009-3339-5