| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.171 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Arrays of Nanoparticles from Self-Assemblies of Diblock Copolymer Micelles in Bimodal Size Distribution |
| 초록 | In a selective solvent for one of the blocks, diblock copolymers spontaneously self-associate into spherical micelles consisting of a soluble corona and an insoluble core. These micelles can be coated onto solid substrates by dip coating or spin coating to form nanostructured arrays, which can be used as a template to synthesize nanoparticles. In this research, we prepared a binary mixture solution of diblock copolymer micelles having the two different sizes. Within the condition that hybridization of large and small micelles was excluded, the size and number ratios of copolymer micelles in the mixture solution were effectively controlled. From the mixture solution, an ordered nanostructure of bimodal micelles was self-assembled, in which hexagonally ordered large micelles were surrounded by small micelles. We utilized the ordered self-assembly of diblock copolymer micelles in the bimodal size distribution as a structured template to synthesize two different types of nanoparticles in specific locations. For example, Au nanoparticles were synthesized in the core of large micelles and Pt nanoparticles in the core of small micelles, resulting in an array of Au nanoparticles enclosed by Pt nanoparticles. Moreover, spatial locations of Au and Pt nanoparticles were switched over simply by exchanging the precursors of nanoparticles between the cores of large and small micelles. The methodology based on an ordered self-assembly of diblock copolymer micelles in the bimodal size distribution can be applicable to various pairs of nanoparticles to generate multifunctional arrays. Fig. 1. Plan-view TEM images of single-layered films of polystyrene-block-poly(4-vinyl pyridine) copolymer micelles having two different sizes. The control on the size and number ratio of copolymer micelles made it possible to fabricate an ordered self-assembly shown in (b). |
| 저자 | 유성일1, 손병혁2, 최정화2, 진왕철1 |
| 소속 | 1포항공과대, 2서울대 |
| 키워드 | micelle; nanoparticles; bimodal size |
