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  • 09월 06일 11시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제112회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Supra- Quantum Dots

2013년 9월 5일 17시 04분 34초
PHYS2-5 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 16시 : 30분
물리화학 - Recent Trends in Physical Chemistry
저자 및
포항공과대학교 화학과, Korea
‘Bottom-up’ assembly of small building blocks such as atoms, molecules and nanoparticles into hierarchically organized structures can be ubiquitously found in nature. The building blocks can be designed with a precision that cannot be achieved by current lithographic techniques. Colloidal quantum dots (QDs) can be tailored by the size and shape typically in a few nm size regime, and they can be also assembled into three-dimensional superlattices of artificial metamaterials. Herein we intend to introduce unique structure of colloidal nanocluster which is composed by three dimensionally self-assembled QDs. Because of the similarity with supramolecule formation, we name the cluster as ‘supra- quantum dot (SQD)’. Slightly truncated zinc-blende QDs of a few nm in size can self-assemble into a relatively uniform size cluster of tens of nm via oriented attachment growth process which is often found in biomineralizations. The clusters evolve into larger clusters via a few discrete stages because of the topological uniqueness of its space filling incapability, and finally become nearly spherical SQDs of typically ∼100 nm in size. SQDs can be obtained with near monodispersity and can form superlattices of SQDs. SQDs have excellent colloidal properties allowing precipitation-based size selection, surface ligand exchange, and cation exchange process. As the result, uniquely structured SQDs of desired composition can be dispersed in any medium. For example, SQDs can be applied for photovoltaic devices for enhanced exciton migrations and carrier extractions.