Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 45, Pages 25171-25179Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06631
Keywords
surface adhesion; nanotextured substrate; nanoimprint lithography; metal-polymer interface; flexible substrate
Funding
- Center for Advanced Meta-Materials (CAMM) - Ministry of Science, ICT
- Future Planning as Global Frontier Project [CAMM 2014M3A6B3063707]
- Creative Research Program - Ministry of Strategy and Finance [ER150003]
- Korea Institute of Materials (KIMS) [PNK4151]
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Metal thin film electrodes on flexible polymer substrates are inherently unstable against humidity and mechanical stresses because of their poor adhesion properties. We introduce a novel approach for improving the adhesion characteristics of metal-polymer interface based on the nanostructuring of the polymer substrate by using nanoimprint lithography. The adhesion characteristics of metal-polymer interface were measured by accelerated test, cyclic bending test and double cantilever beam (DCB) test. The interface of Au/Ti dual layer thin film and nanoimprinted PMMA substrate shows over 2.03 and 1.95 times higher adhesion energy (G(c)) than that of Au/Ti dual layer thin film and plane PMMA substrate in air and wet environments, respectively. The adhesion energy between metal thin film and polymer substrate was dramatically improved by the increased surface roughness and mechanical interlocking effect of numerous nanoscale anchors at the edges of nanoimprinted surface, which was verified by both experiment and numerical analysis.
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