Journal
SOFT MATTER
Volume 8, Issue 19, Pages 5375-5380Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2sm07440k
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Funding
- National Research Foundation of Korea (NRF) [20110017530]
- World Class University (WCU) [R31-2008-000-10083-0]
- Basic Science Research Program [2010-0027955]
- Korea Research Foundation [KRF-J03003]
- Institute of Advanced Machinery and Design (IAMD)
- Center for Multiscale Energy System
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We present a simple, yet robust, technique for controlling the tip geometry of nanopillars by utilizing a two-step process of partial photopolymerization of UV-curable polyurethane acrylate (PUA) resin and subsequent tip shape modification. With this technique, head structures of nanopillars were precisely transformed from hemispherical to protruding, mushroom-like tips without any loss in structural integrity of the nanopillars. Nanoscopic and macroscopic adhesion measurements for angled nanopillars with modified tips demonstrated that mushroom-like structures fabricated by our approach could greatly enhance adhesion strengths as compared to unmodified, round head structures. Also, directional adhesion characteristics of angled nanopillars were maintained regardless of tip shapes.
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