CdS纳米锥的合成以及光致发光性能研究

摘要

将商用CdS粉在真空炉中通过简单的热蒸发获得了大量高纯的CdS锥状纳米结构.扫描电子显微镜(SEM)、透射电子显微镜(TEM)观察和X射线衍射谱(XRD)的分析表明:CdS纳米锥状晶体为六角硫镉矿晶体结构,其形状为典型的纳米锥,晶格常数为a=0.413 nm,c=0.671 nm,沿着[0001]方向生长.CdS纳米锥的长度是20 μm到50 μm,直径从～100 nm减少到～20 nm.本文还详细研究了CdS纳米锥晶体的拉曼特性及其在激光辐射下的室温光致发光行为,探讨了绿光(波长为～512 nm)发射的机制.结果表明,这种CdS纳米锥可能用于新颖的光学器件.%High purity CdS nanocones were obtained through a simple thermal evaporation process with highly active CdS nanoparticles as the evaporation source. It was found that these CdS nanocones had a single crystal hexagonal wurtzite structure growing along the [0001 ] direction. They had a cone-shaped morphology with typical length of 20 μm to 50 μm and their diameter decreases from ～ 100 nm to 20 nm with lattice constants of a = 0.413 nm and c = 0.671 nm. The photoluminescence (PL)characterization of the CdS nanocones shows strong near-band UV emission (about 512 nm), which indicates that the CdS nanocones have potential application in optoelectronic devices.