长方体形CdS微粒的合成及光谱性质

采用溶胶法，以硫脲为表面修饰剂，合成了长方体形CdS微粒，并用X射线粉末衍射、透射电子显微镜、红外光谱以及荧光光谱等手段进行了表征。实验结果表明，硫脲分子中的硫原子与CdS纳米晶表面的Cd2+离子存在配位作用；硫脲分子表面修饰的CdS纳米晶为立方闪锌矿结构，具有较好的荧光性质；长方体形CdS微粒可能是由硫脲分子表面修饰的CdS初级纳米晶粒自组装组成。该研究结果为硫脲分子表面修饰的CdS初级纳米晶粒在分子组装及作为新型发光材料方面的进一步研究奠定了基础。

Synthesis and Spectral Properties of Cuboid-Shaped CdS Particles

Cuboid-shaped CdS particles were synthesized with sol-gel method by using thiourea as surface modifier and characterized by X-ray diffraction, transmission electron microscopy, infrared absorption spectrum and fluorescence spectrum. The results show that the sulfur atoms in thiourea molecules coordinate with Cd2 ions on the surface of the nanocrystals. The thiourea-modified CdS particles have a zinc blende crystal structure and good fluorescent characteristics. The cuboid-shaped CdS particles are probably assembled by hydrogen bonding between primary CdS nanocrystals surface-capped with thiourea. The result will promote the researches into molecular self-assembly of nanocrystals and help develop novel luminescence material.