| 초록 |
Recently block copolymers embedded with nanoparticles have been studied in various scientific field including electronics, biotechnology, and catalysis due to the special size effect. Block copolymers belong to a broad class of compounds that can self-assemble into ordered phase with periodic microstructure. The addition of a nanoparticle to a block copolymer can significantly alter the range of accessible self-assembled morphologies, and appropriate condition of external fields such as electric field, the self-assembly can produce long range order and particular alignment. When nanoparticles are inserted into block copolymer microdomains, they are selectively coordinated by one block due to the entropic & enthalpic interaction difference. In this study, we investigated orientation of nanoparticles in block copolymer thin films under electric field. We used electric sensitive block copolymer (PS-b-PMMA) and magnetic nanoparticles (γ-Fe2O3). We observed that γ-Fe2O3 nanoparticles are selectively located one microdomain on PS-b-PMMA, as confirmed by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS) experiments. We also studied the effect of electric field strength on nanoparticles and block copolymer morphology using TEM and atomic force microscopy(AFM). |
