不同溶剂中制备单分散量子点

选用比较缓和反应条件，用无毒、价廉、稳定性好的无机化合物作为反应前驱体制备半导体量子点材料．通过选择不同的反应溶剂，可以得到粒径大小不同从而发光波长可“调谐”的一系列CdSe量子点材料．用紫外吸收光谱（UV—Vis），荧光发射光谱（PL）跟踪了反应的过程，用X射线衍射（XRD）和透射电镜（TEM）对得到的量子点材料的结构进行了表征．对量子点材料在有机溶剂和水溶液中的转相进行了研究，为量子点与生物分子的连接，进而在生物标记方面的应用提供材料基础．该方法是对传统高温条件下有机金属化合物前驱体分解制备方法的补充，是一种环境友好的半导体量子点材料的制备方法．

The Synthesis and Characterization of Monodisperse CdSe Quantum Dots at Different Organic Solvents

Nearly monodisperse CdSe quantum dots were prepared by a soft solution approach using air-stable reagents at different organic solvents.This scheme is a supplement of the conventional organicmetal materials decomposing at higher temperature.Different size CdSe nanocrystals could be obtained by simply change the reaction solvent.The reaction process was monitored by the temporal evolution of the absorption and room temperature photoluminensce spectra.The structures of the CdSe quantum dots were determined by X-ray powder diffraction(XRD) and transmission electron microscopy(TEM).The phase transfer of oleic acid stabilized CdSe nanocrystals into PBS buffer solutions of mercaptopropionic acid was also studied for their potentials in biological applications.This method is reproducible and simple and thus can be readily scaled up for industrial production.