Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 17, Issue 13, Pages 2211-2218Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200600564
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Wafer-scale polymer nanofabrillar structures have been fabricated using the combination of colloidal nanolithography, deep-silicon etching, and nanomolding to mimic the nanostructure of gecko foot-hairs. The artificial surface features densely packed polymeric nanofibrils with super-hydrophobic, water-repellent, and easy-to-clean characteristics. The lateral dimension of the nanofibrils is as small as 250 nm and an aspect-ratio as high as 10:1 has been achieved without lateral collapse between neighboring fibrils. The method allows both fabrication of synthetic structures over a large area and direct integration of a flexible membrane to assist the array of nanofibrils in making intimate contact with uneven surfaces. A single nanofibril exhibits a mean adhesive force ranging from (0.91 +/- 0.34) nN to (1.35 +/- 0.37) nN. In the macroscopic scale, the nanostructured surface can adhere firmly to a smooth glass substrate and inherits the in-use, self-cleaning property of the setal nanostructures found in gecko lamellae.
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