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以乙二胺和丙烯酸甲酯为原料,采用扩散法合成了不同端基类型不同代数的聚酰胺-胺(PAMAM)树形分子,并用红外光谱进行表征;以G5.0-NH2PAMAM树形分子为模板,以二甲基亚砜为溶剂,在常温下制备了稳定的PAMAM树形分子包覆的CdSe@CdS核壳结构量子点,并用紫外-可见吸收光谱和荧光发射光谱进行表征。结果表明,适当厚度CdS的包覆修饰可以有效提高CdSe量子点的发光性能;与单一组分的CdSe量子点相比,CdSe@CdS核壳结构量子点的相对荧光强度最大提高约123%。
Polyamidoamine (PAMAM) dendrimers with different terminal groups were synthesized by diffusion method using ethylenediamine and methyl acrylate as raw materials. The dendrimers were characterized by FTIR spectroscopy. The dendrimers of G5.0-NH2PAMAM Template, a stable PAMAM dendrimer CdSe @ CdS core-shell quantum dot was prepared at room temperature with dimethylsulfoxide (DMSO) as a solvent. The quantum dots were characterized by UV-Vis absorption spectra and fluorescence emission spectra. The results show that CdSe CdS quantum dots can improve the luminescent properties of CdSe QDs. The relative fluorescence intensity of CdSe QS core-shell QDs increases about 123% compared with that of CdSe QDs.