以醋酸镉、硫粉为原料制备CdS量子点, 研究了硫的加入量对其光学性质的影响. 结果表明: 合成的CdS量子点粒径均匀, 分散性较好, 随着硫加入量的增加CdS量子点的粒径增大; 反应中过量的硫能有效地填补硫空位, 从而抑制表面态发光. 同时, ODA的修饰也能有效地钝化表面态, 减小表面态的发光强度.
The 2.5 nm, 3.5 nm and 5.0 nm diameter CdS quantum dots had been synthesized using octadecylamine (ODA) as surfactant and solvent. The size and composition of quantum dots could be adjusted by changing the amount of added sulfur. The size of CdS quantum dots was increased with the increase of sulfur during the synthesis procedure. On the other hand, the excess sulfur will eliminate the sulfur vacancies effectively and suppress the surface state emission. The ODA could passivate the surface states presented on the surface of CdS quantum dots and suppress the surface states emission effectively.
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