以聚酰胺-胺树形分子为模板制备AgI纳米簇

本文以聚酰胺-胺(PAMAM)树形分子为模板,原位制备AgI纳米簇.系统地研究了AgI纳米簇制备过程中各种反应条件如树形分子端基、反应时间、Ag⁺与PAMAM摩尔比等对AgI纳米簇粒径的影响,分别用紫外-可见光谱、荧光光谱、透射电镜等对所制备的纳米簇进行表征.在相同的条件下,以G4.5-COOH₃为模板较以G5.0-NH₂为模板制备的AgI纳米簇粒径小、分布均匀,这主要取决于G4.5-COOCH₃PAMAM树形分子所起的“内模板”作用.G4.5-COOH₃树形分子浓度为1×10^-5mol/L,Ag⁺与树形分子摩尔比为30:1时所制备的AgI纳米簇的粒径分布均匀、稳定性好,室温避光可稳定存在两个月以上.

Preparation and Characterization of AgI Nanoclusters with PAMAM Dendrimers as Template

AgI nanoclusters were successfully prepared by using PAMAM dendrimers as templates in water system. In the prepared process, the size and size distribution of prepared AgI nanoclusters depend on the the terminated groups of PAMAM dendrimers, reaction time, the molar ratio of silver ions to PAMAM dendrimers. The gained AgI/PAMAM dendrimer nanocomposites were characterized by UV-Vis spectrophotometer,fluorescence spectrophotometer,TEM. The size of prepared AgI nanoclusters depend on the the terminated groups of G4.5-COOCH_3 PAMAM dendrimers were smaller than G5.0-NH_2 PAMAM dendrimers in the same conditions. This was result of the inner-template of G4.5-COOCH_3 PAMAM dendrimers. The results show that the stability of AgI/PAMAM dendrimer nanocomposites was better and could preserve more than two months in the room temperature when G4.5 concentration is 1×10~ -6 mol/L,the ratio of Ag~+ to G4.5 dendrimer is 20.