Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 7, Pages 1927-1933Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am1002537
Keywords
flexible electronics; gold; thin films; stress; elastomers
Funding
- New Jersey Commission on Brain Injury Research
- Alexander von Humboldt Foundation
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Gold films on poly(dimethylsiloxane) (PDMS) have applications in stretchable electronics, tunable diffraction gratings, soft lithography and as neural interfaces. The electrical and optical properties of these films depend critically on the morphology of the gold. Therefore, we examine qualitatively and quantitatively the factors that affect the morphology of the gold film. Three, morphologies can be produced controllably: microcracked, buckled, and smooth. Which morphology a gold film will adopt depends on the film stress and the growth mode of the film. The factors that affect the film stress and growth mode, and thus the morphology, are as follows: deposition temperature, film thickness, elastic modulus, adhesion layer thickness, surface properties of the PDMS, and mechanical prestrain applied during deposition We discuss how the different components of the film stress and growth mode of the film affect the morphology.
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