Preparation and Luminescent Properties of CdSe and Core-Shell CdSe/CdS Quantum Dots in Aqueous Solution
Preparation and Luminescent Properties of CdSe and Core-Shell CdSe/CdS Quantum Dots in Aqueous Solution
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发表时间：
2006
影响因子：
1.7
通讯作者：
T. Ai
中科院分区：
文献类型：
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作者：
T. Ai
以巯基乙酸为稳定剂，在水溶液中制备了CdSe和核/壳CdSe/CdS量子点。利用紫外-可见吸收光谱和发射光谱对其发光特性进行了研究。采用x射线粉末衍射（XRD）、透射电子显微镜（TEM）和x射线光电子能谱（XPS）对纳米晶体进行了表征，并对其结构、形状和组成进行了表征。结果表明，用该方法合成的量子点具有更好的分散性，修饰表面的量子点发光强度大大增强，发射光谱和吸收光谱均出现红移。吸收峰的位置随量子点尺寸的不同而不同。
CdSe and core/shell CdSe/CdS quantum dots (QDs) were prepared in aqueous solution by using mercapto-acetate acid as stabilizer.Their luminescence characterization was studied by UV-Vis absorption and emission spectra. The nanocrystals were characterized by X-ray powder diffraction (XRD),transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS), which were used to characterized their structure, shape and composition. The results indicated that the quantum dots synthesized with this method possessed better dispersibility, as well as the intensity of luminescence of the quantum dots modified the surface was enhanced greatly and the red shift was shown in the emission and absorption spectra. The position of absorption peak was different with the different quantum dots' sizes.