| 초록 |
Here, we demonstrate the directed-dewetting of polymer thin film on topographical patterns of gold nanoparticles(AuNPs). To prepare the topographical patterns of AuNPs, the nano-stripe patterns of poly(tetrafluoroethylene)(PTFE) are first fabricated by physically rubbing a PTFE bar on Si substrate over its melting point. Then the bare surface exposed between nano-stripe patterns is chemically modified. Therefore, once the substrates are immersed in the AuNPs solution, the particles are spatially placed between the soft patterns due to interaction of AuNPs and amine. By applying RIE process, all organic components are removed and only uniform arrays of the NPs are remained on the substrate. Finally, polymer thin films are spin-coated on AuNPs patterns. To induce directed-dewetting of the film, samples are thermally annealed. After that, it is found that the films are selectively dewetted on the surface due to synergetic effect of surface tension difference and topographical Au patterns. |
