期刊
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
卷 19, 期 2, 页码 246-253出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JMEMS.2010.2041189
关键词
Microfabrication; nanocomposite; nanoparticle; photolithography; polytetrafluoroethylene (PTFE); superhydrophobicity; SU-8
类别
资金
- National Science Foundation [ECCS-0846502, CMMI-0944353]
- Directorate For Engineering [0846502] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [0846502] Funding Source: National Science Foundation
In this paper, we first report on directphotolithography-based microfabrication of transparent superhydrophobic micropatterns using novel photodefinable nanocomposites, combining the nanomorphology and hydrophobicity of polytetrafluoroethylene (PTFE) nanoparticles and the photopatternability and transparency of an SU-8 photoresist using both direct-mixing and coating-immobilization methods. The direct mixture of PTFE-SU-8 nanocomposite can be reliably spin-coated and photopatterned onto transparent substrates (e. g., glass or polymers) with a minimal feature resolution of 50 mu m. The resulting nanocomposite film possesses a contact angle of water at 150 degrees, although its optical transparency is less than 30%. Furthermore, a modified coating-immobilization approach, employing spray coating and thermal immobilization of PTFE nanoparticles onto an SU-8 polymer matrix, significantly enhances superhydrophobicity, lithography resolution, as well as optical transparency. The highest optical transparency of 80% and a minimal feature resolution of 10 mu m have been achieved using the standard photolithography approach, while the contact angle of water above 165 degrees. enables extraordinary superhydrophobicity with low hysteresis. The novel PTFE-SU-8 nanocomposites provide a unique combination of superhydrophobicity, optical transparency, and photopatternability, along with excellent adaptability and simple processability, which offer great extension to rapidly evolving micro -nanoengineering applications. [2009-0224]
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