Stretchable gold tracks on flat polydimethylsiloxane (PDMS) rubber substrate
(2008) The Journal of Adhesion — Vol. 84, n° 3, p. 231-239 (2008)
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- Abstract
- A process to fabricate stretchable gold tracks on silicone rubber substrates is studied by XPS, static water contact angle measurement, AFM, and SEM. The process involves several steps: removing uncured oligomers by hexane Soxhlet extraction; pre-stretching the substrate; activating the strained silicone surface by an oxygen plasma treatment; coating the strained substrate with 5nm titanium and 80nm gold layers; and finally releasing the sample. The plasma treatment creates a thin brittle silica-like layer that temporarily increases the substrate's surface energy. Indeed, the plasma treatment is followed by a hydrophobic recovery. As a consequence, the delay between plasma treatment and metal deposition has to be reduced as much as possible. The silica-like layer can be nicely observed after release. The entire process allows us to obtain stretchable metallized samples that remain conductive even after an excessive deformation leading to electrical failure.
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Citations
Béfahy, S., Yunus, S., Burguet, V., Heine, J.-M., Troosters, M., & Bertrand, P. (2008). Stretchable gold tracks on flat polydimethylsiloxane (PDMS) rubber substrate. The Journal of Adhesion, 84(3), 231-239. https://doi.org/10.1080/00218460801954292 (Original work published 2008)