Poly (N-vinyl-2-pyrrolidone)-capped CdS nanocrystals with different crystalline sizes were synthesized through a simple solvothermal method. The structures of the as-synthesized samples were characterized by XRD, N2 physisorption, TEM, IR spectroscopy, and UV-Vis spectroscopy. The results show that the as-synthesized samples are poly (N-vinyl-2-pyrrolidone)-capped CdS nanohybrid materials; the grain size of CdS nanocrystals is smaller when tetramethylammonium hydroxide(TMAH) is introduced in the reaction system. In addition, it is also found that the bandgap of CdS nanocrystals is blue shifted and the visible-light photocatalytic activity of the sample synthesized in the presence of TMAH increases due to the size effect.%采用溶剂热法合成了具有不同晶粒尺寸的聚乙烯吡咯烷酮(PVP)修饰的CdS纳米晶,并运用XRD,N2物理吸附,TEM,IR,UV-Vis等手段进行表征.结果表明,所制得的样品均为聚乙烯吡咯烷酮(PVP)修饰的CdS纳米晶;添加四甲基氢氧化铵(TMAH)有利于获得晶粒尺寸较小的CdS纳米晶;受纳米晶粒尺寸的影响,CdS纳米晶的吸收边发生蓝移且可见光催化活性明显提高.
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