【摘要】 采用两相法合成了CdSe/CdS核-壳结构的量子点,用氨水催化水解正硅酸乙酯制得复合结构的CdSe/CdS/SiO2发光纳米球.通过对量子点用量、氨水用量、反应时间及溶剂比例等实验条件的调节,得到了单分散性较好,尺寸在23~145 nm的复合发光纳米球.利用紫外-可见吸收光谱和荧光发射光谱对其发光性能进行了研究,同时利用透射电镜(TEM)观察复合纳米球的形貌.结果表明,复合发光纳米球样品的最高荧光量子产率可达8%.更多还原

【Abstract】 Luminescent CdSe/CdS core-shell quantum dots were synthesized by two-phase method.These CdSe/CdS quantum dots are encapsulated with silica spheres from hydrolysis of tetraethylorthosilicate(TEOS) in the presence of ammonium.Adjusting the amount of quantum dots and ammonia,the reaction temperature and time as well as ratio of solvents,the size of as-prepared CdSe/CdS/SiO2 nanospheres can be tuned in the range of 23—145 nm.The samples are characterized by TEM,UV-Vis,and fluorescence spectrometer,respectively.The highest quantum yield(QY) of the CdSe/CdS/SiO2 sample can reach 8.0%.更多还原