CdS纳米颗粒的合成、表面修饰及光学特性研究

用一步室温固相化学反应法合成CdS纳米颗粒，并以氨催化水解法对其表面进行了修饰，得到了具有CdS／SiO2核／壳结构的纳米微球，以透射电子显微镜和X-射线衍射仪对其结构和物相进行了表征，并研究了其光致发射光谱的性质，研究结果表明：固相反应完全，产物为纯相CdS，室温固相化学反应法避免了传统湿法存在的团聚现象的缺点，具有产率高、无污染、节能等优点；而且CdS纳米颗粒表面经SiO2修饰后，其带边发射显增强，缺陷发射减弱，且在一定范围内随着SiO2包覆层厚度的增加，荧光强度增加。

Study of the Synthesis, Surface Modification and Optical Properties of CdS Nano-Particles

The optical properties of nanoparticles with Cds/SiO_2 core/shell were investigated.The CdS core of narrow size distribution were produced by solid-state synthesis method in room temperature, and the surface of CdS nanoparticles were coated with a layer of SiO_2 .The size and the coated structure were characterized by the transmission electron microscope and the powder X-ray diffraction. The results indicated that the solid state reaction was complete and the product was CdS. The photoluminescence(PL) showed that the coating of SiO_2 could reduce the emission of surface traps of CdS nanoparticles and enhance the emission of band edge. To some degree, the PL increased when the coated SiO_2 layer became thicker.