|AVS 54th International Symposium|
|Applied Surface Science||Tuesday Sessions|
|Session:||Aspects of Applied Surface Science Poster Session|
|Presenter:||K. Honda, Kyushu University, Japan|
|Authors:||K. Honda, Kyushu University, Japan
M. Morita, Daikin Industries, Japan
A. Takahara, Kyushu University, Japan
|Correspondent:||Click to Email|
Various studies have been done on the nanofabrication of polymeric materials. However, most of the studies utilize conventional polymers and little attempt has been done for the design of polymeric materials for nanofabrication. In this study, room temperature nanoimprinting of polymer thin films will be presented. Nanoimprinting technology using compression molding of thermoplastic polymers is a low cost mass manufacturing technology and has been around for several decades.1 The polymer used for nanoimprint experiment is Poly(2-(perfluoroocthyl ethyl) acrylate) with long fluoroalkyl group (PFA-C8). In previous report, the authors studied wetting properties and surface molecular aggregation of PFA-C8 thin films and clarified that PFA-C8 showed the high water repellency because of crystaliization of long fluoroalkyl group.2,3 PFA-C8 was spin-coated on the Si-wafer. The film thickness was estimated as approximately 500 nm by atomic force microscopy (AFM). The mold patterned with lines (L/S of 500 nm) was imprinted onto a spin-coated PFA-C8 thin film under various imprinting conditions and nanoimprinting characteristics of PFA-C8 was investigated on the basis of scanning elerctron microscopy (SEM), AFM and contact angle measurement. The line patterns were observed on PFA-C8 film surface by AFM and SEM. In addition, PFA-C8 film was sucessfully nanoimprinted at room temperature because of the weak interaction among rigid fluoroalkyl groups in crysatallite. The nano-textured PFA-C8 exhibited super hydrophobicity as well as high oleophobicity. Also, line imprinted surface showed anisotropic wetting behavior. The super hydrophobicity was explained by the notion of heterogeneous wetting proposed by Cassie. In this case, the space between the solid surface and probe liquid was occupied by air and consequently the contact angle was increased.
1 S. Y. Chou, P. R. Krauss, and P. J. Renstrom, Science, 85, 272 (1996).
2 K. Honda, M. Morita, H. Otsuka, and A. Takahara, Macromolecules, 38, 5699 (2005).
3 K. Honda et al., Trans. Matter. Res. Soc. Jpn., 32, 239 (2006).