PAMAM树状大分子模板法合成CdSe量子点及其发光性质的研究

Preparation of CdSe quantum dots using inner PAMAM dendrimer templates and study on their photoluminescence

以聚酰胺-胺(PAMAM)树状大分子为模板合成了CdSe量子点,X-射线粉末衍射(XRD)分析表明产品与闪锌矿结构的CdSe晶体的标准粉末衍射花样的3个强峰位置相同,透射电镜(TEM)分析显示CdSe量子点包裹在树状大分子孔隙中,分散良好。实验表明以2.5G和3.5GPAMAM为模板合成的产品没有检测到荧光发射,而以4.5GPAMAM树状大分子为模板制备的产品在410～465nm范围内有较强的荧光发射,其发光波长随反应温度改变。

CdSe quantum dots（QDs）were synthesized using the generation 2.5 G,3.5 G and 4.5 G ester-terminated PAMAM dendrimers as inner-templates.CdSe QDs were characterized by X-ray powder diffractometry（XRD）and transmission electron microscopy（TEM）.The results showed that CdSe QDs templated by the generation 4.5 G PAMAM dendrimers were dispersed uniformly and the photoluminescence emission peak changed from 410 nm to 465 nm when the reaction temperature increased from 45 to 75 ℃.