Adhesion Enhancement of PDMS Surface for Stretchable Printed Conductive Tracks with Atmospheric Plasma Treatment
Date Issued
2016
Date
2016
Author(s)
Li, Chun-Yi
Abstract
In this study, an effective plasma treatment method was developed to modify polydimethylsiloxane (PDMS) surface to enhance the adhesion of printed conductive thin films. After the plasma treatment, a silica-like surface layer, which was confirmed with XPS results, was formed on the PDMS surface and resulted in a drastic decrease in water contact angle. The silica layer disappeared after a few hours and the treated PDMS surface recovered it hydrophobicity. Effects of gas and plasma powers on the transient contact angle decreases were carefully examined to extend the life time of the surface silica layers. Conductive ink with epoxy resin was screen-printed on the plasma-treated PDMS surface. The printed patterns showed good adhesion, as a result of the strong binding between epoxy resin and the silica surface layer, and can sustain well in tape and sonication tests. Bending and stretching tests were also performed to test the stability of the printed tracks. Finally, printed pressure sensors with good sensitivity and fast response times were fabricated to demonstrate the capability of applying this method for the realization of printed electric devices.
Subjects
adhesion
stretchable electronics
conductive thin film
PDMS
atmospheric plasma treatment
flexible printed electronics
Type
thesis
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