| 초록 |
We suggest unique method for achieving perpendicular orientation of the anisotropic microdomain of poly(styrene-b-isoprene) (PS-b-PI) diblock copolymer, which shows large difference in surface tensions of PS and PI blocks. Magnetic nanoparticle (mNP) monolayers on the Si substrate were successfully prepared with aid of Langmuir-Blodgett technique. To study the internal structure of a cylinder-forming PS-b-PI on the mNP monolayer, we fabricated bilayer structure by spin coating PS-b-PI on top of mNP monolayer by varying the thickness of block copolymer. The simple treatment of Si substrate with mNP created remarkable change in orientation of the PS-b-PI diblock copolymer. Particularly, for the higher surface coverage of mNPs above 70 %, clear vertical orientation of the PS-b-PI from the mNP substrate was observed in film thickness ranges from 150 nm to 600 nm verified by GISAXS, cross-sectional TEM and AFM. |
