| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.40 |
| 발표분야 | 기능성 고분자 |
| 제목 | Fabrication of Nanowires using Block Copolymer Nano-porous Templates with High Aspect Ratio |
| 초록 | Block copolymers which self-assemble to make periodic structures with well-defined size and spacing on the tens of nanometers length scale have attracted a lot of attention due to its possible usage as functional nanostructures. Especially, nanoporous template prepared by block copolymer thin films can be used as an etch mask, or the pores filled via electrochemical depostion of conducting polymers or magnetic materials. In this study, we used polystyrene-block-poly(methyl methacrylate) copolymers (PS-b-PMMA) with PMMA cylindrical nanodomains to make nano-porous structures oriented perpendicularly to the substrate. PS-b-PMMA was spin-coated onto a neutral brush modified by polystyrene-random-poly(methyl methacrylate) copolymers (PS-r-PMMA) layer attached to the ITO glass. It is found that even if the thickness of the thin film increased up to ~300 nm, PMMA cylindrical microdomains were perpendicularly oriented to the substrates. Nanoporous templates were made after UV irradiation followed by rinsed by acetic acid. The hole diameter of pores was controlled by the amount of added PMMA homopolymer. These nanoporous templates are also employed to produce photovoltaic devices with high conversion efficience. For this purpose, hexagonally-packed nanowires of polypyrrole(PPy) or poly(3-hexyltiophene) (P3HT), which is commonly used as a P-type material, were preapred by electro-polymerization of pyrrole monomer inside nanoholes and by spin-coating of P3HT. After removing PS matrix, N-type materials can be spin-coated. This geometry gives large contact area of P-N heterojunction, which allows a high efficiency of the current conversion from the light. |
| 저자 | 이정인1, 장정아1, 오승원2, 장범진2, 유재웅2, 김진곤1 |
| 소속 | 1포항공과대, 2한국과학기술(연) |
| 키워드 | blockcopolymer nano-porous template; nanowires |
