Professor Kookheon Char 講演会

New Layer-by-Layer Deposition Method for Ultrathin Multilayer Films and Their Mircopatterning

Professor Kookheon Char

School of Chemical & Biological Engineering
Seoul National University
E-mail: khchar@plaza.snu.ac.kr

主催：高分子学会九州支部
共催：九州大学　高分子機能創造リサーチコア、九州大学21世紀COE「分子情報科学の機能イノベーション」
日時：2005年2月10日（木）16:00-17:30
場所：九州大学箱崎キャンパス旧研究所建物２０１号室

Char教授はソウル大学化学生物工学部の教授で、韓国を代表する高分子科学の若手研究者です。Char教授は高分子ナノ材料の構造と物性に関して、中性 子散乱などの手法を用いて活発に研究されています。今回、九州を訪問され る機会に講演会を企画しました。多数、ご出席くださいますよう、ご案内申し上げます。

　Fabrication of multilayer thin films has recently 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. In this presentation, a new method to build up organic/organic and organic/inorganic multilayer films composed of organic polyelectrolytes and inorganic nanoparticles using a spinning process is introduced. The adsorption process of the spin-coating self-assembly (SCSA) method applied to the present work is mainly driven by both the viscous force by fast solvent elimination and the electrostatic interactions between oppositely charged species. On the other hand, the centrifugal and air shear forces applied by the spinning process significantly enhance the desorption of weakly adsorbed polyelectrolyte chains and also lead to the planarization of the adsorbed polyelectrolyte layer. We also demonstrate with X-ray reflectivity that the alternating organic/inorganic ultrathin films fabricated by the spin-coating SA process retain highly ordered internal structure in comparison with those prepared by the conventional dipping SA process.
　 A new approach to create multilayer thin 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. Additionally, by using the lift-off method, patterned multilayer films with arbitrary shape can be obtained and important parameters to control the pattern quality will be addressed. In the light of wide application range of the ultrathin multilayer films, the spin SA process presented in this study opens up new possibilities for highly efficient electronic/photonic devices based on the well-defined multilayer structure.

問合先：
九州大学先導物質化学研究所分子集積化学部門
大塚英幸、高原　淳
電話　092-642-2721
http://takahara.ifoc.kyushu-u.ac.jp
e-mail:takahara@cstf.kyushu-u.ac.jp