Journal
LANGMUIR
Volume 26, Issue 8, Pages 5295-5299Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la100409c
Keywords
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Funding
- Ministry of Science and Technology for Complementary Hybridization of Optical and Fluidic Devices for Integrated Optotluidic Systems
- Brain Korea 21
- National Research Foundation of Korea [2006-0050630] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this Letter, we present a simple and reproducible method for generating polystyrene (PS) nanoneedle arrays by utilizing the trapping of inorganic silica particles at the polystyrene/air interface via capillary wetting of a thermoplastic polystyrene polymer and SF, reactive-ion etching. A monolayer of silica microspheres was directly formed and trapped on the smooth PS film, and subsequent wet etching with HF and reactive-ion etching with SF6 left behind hexagonal arrays of protruding tips with tip diameters around 20 nm. The patterned PS surface possessed a well-defined nanoneedle array with the pattern density as high as 2.5 x 10(8)/cm(2) and exhibited advancing and receding water contact tingles of 180 degrees. The surface showed no affinity for water as confirmed by a series of contact, compression, and release tests. Finally, the perfect hydrophobicity of the fabricated surface is explained in terms of its surface morphology and chemical composition.
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