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Synthesis and Characterization of CdSe/ZnSe/ZnS Quantum Dots and Biological Tagging

2005년 2월 23일 17시 27분 41초
금6C3심 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 15시 : 00분
물리화학 - 물리Ⅰ: 나노과학의 물리화학적 접근법
저자 및
포항공과대학교 화학부,
Highly luminescent semiconductor nanocrystals, often called quantum dots (QDs), offer a number of useful optical properties, such as the size-tunable emission color, a broad range of excitation wavelengths, and a symmetric and narrow emission spectrum. QDs have been widely used in biological labeling applications due to the brightness and the longevity in emission. In this report, we wish to present a CdSe/ZnSe/ZnS core/double shell structure that significantly enhances the PL properties. We synthesized approximately 3.5-nm size core CdSe QDs and passivated the surface with ZnSe and/or ZnS shells to prepare CdSe/ZnSe, CdSe/ZnS, CdSe/ZnSe/ZnS core/shell QDs. We characterized the optical properties of QDs by examining the temperature dependence of time-resolved photoluminescence in the 10-300 K range. The effect of the core/shell structure on the dynamics of emission states was elucidated from thermal variation of fluorescence lifetime. We characterized the lattice structures of QDs by investigating the temperature dependence of X-ray powder diffraction patterns in the 10-300 K range. The XRD patterns from the core, the shell, and the interface layers were differentiated from their thermal variations. QDs were made water-soluble by passivating the shell surface with mercapto-propionic acid. Bovine serum albumin (BSA) and Rat Immunoglobulin G (IgG) antibody were conjugated with QDs and the QD-protein conjugates were characterized by gel electrophoresis and other spectroscopic techniques. Details will be presented in the symposium.