| 학회 | 한국고분자학회 |
| 학술대회 | 2003년 봄 (04/11 ~ 04/12, 연세대학교) |
| 권호 | 28권 1호, p.22 |
| 발표분야 | 특별 심포지엄 |
| 제목 | Fabrication and Patterning of Ultrathin Multilayer Films by Convective Self-Assembly |
| 초록 | Fabrication of multilayer thin films have attracted much interest because they are of great use in thin film devices based on electrochemical processes such as sensors, integrated optics, rectifiers, or light-emitting devices (LED). Most of these applications require the preparation of stable and well-organized films with fast fabrication time. According to the recent work demonstrated by Cho et al., multilayer films with highly ordered internal structure could be easily prepared by the spin self-assembly (SA) process although it is much simpler and faster in preparation than the conventional dip self-assembly process. By varying the spinning speed and the mole concentration of polyelectrolytes (poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate) (PSS)), the adsorbed film thickness per bilayer were easily controlled from about 5 Å to 40 Å Furthermore, the surface of the multilayer films was quite homogeneous and smooth. In this presentation, the spin SA process will be applied to various interactions such as electrostatic attraction and hydrogen bonding, which can give much deeper insight in the mechanism of the spin SA. For both electrostatic attraction and hydrogen bonding, it was found by X-ray reflectivity that the multilayers with well-ordered structure were obtained and showed higher thermal stability. The adsorbed amount employing the electrostatic interaction is effectively increased by the spin SA method than by the dip SA method. However, in the case of using hydrogen bonding, the film thickness and the adsorbed amount is not significantly affected by either coating method. A new approach to create multilayer ultrathin films with well-defined micropatterns is also introduced. To achieve such micropatterns with high line resolution, microfluidic channels were combined with the convective SA process employing both the hydrogen bonding and the electrostatic attraction. The channels were initially filled with polymer solution by the capillary pressure and the residual solution was then removed by the spinning process. Micropatterns with sharp edge boundaries and low roughness were obtained. The small ridges were also observed at the edges of the patterned lines and the feature height was easily controlled. In the light of wide application range of ultrathin multilayer films, the spin SA process presented in this study opens up new possibilities for highly efficient electronic/photonic devices based on multilayer structures. |
| 저자 | 차국헌;김상철;조진한;손희상;장홍석 |
| 소속 | 서울대 |
| 키워드 | patterning; multilayer; self-assembly |
