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Superhydrophobic, Antireflective, Flexible Hard Coatings with Mechanically Ultra-resilient Moth-eye Structure for Foldable Displays
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- Authors
- Hye-Won Yun, Gwang-Mun Choi, Ho Kun Woo, Soong Ju Oh, Sung-Hoon Hong
- Issue Date
- 2020-10
- Citation
- Current Applied Physics, v.20, no.10, pp.1163-1170
- ISSN
- 1567-1739
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- Biomimetic inspiration from the moth-eye structure has led to many studies combining nanoimprint lithography (NIL) to realize low cost and large area anti-reflection (AR) coatings. However, the scope of application is severely limited by poor mechanical performance due to the intrinsic properties of the coating materials and the nanosized patterns. In this work, we demonstrate a moth-eye structured epoxy-siloxane molecular hybrid (ME-ESMH) fabricated using single UV-based NIL (UV-NIL) on a colorless polyimide (CPI), to be utilized as a flexible cover window (FCW) for foldable displays. Low reflection, a superhydrophobicity and good inward foldability were achieved, together with excellent thermal and chemical resistance. Furthermore, in situ uniaxial compression tests revealed that the fabricated structure can be elastically deformed and nearly restored to its original shape even after a large degree of compression. Our findings provide an easy-to-integrate solution for flexible hard coatings with superhydrophobic and AR properties, applicable to foldable optoelectronics.
- KSP Keywords
- Anti-Reflection, Chemical resistance, Colorless polyimide, Epoxy-siloxane, Fabricated structure, Intrinsic property, Low-cost, Mechanical performance, Molecular hybrid, Moth-eye structure, Scope of application