低代端酯基PAMAM树形分子存在下银纳米颗粒的制备

在低代端酯基PAMAM树形分子(G1.5-COOCH₃)存在时，用氢气还原AgNO₃制备出银纳米颗粒。用透射电子显微镜(TEM)，电子衍射(ED)，紫外-可见吸收光谱(UV-Vis)和红外光谱(FT-IR)对所制备的银纳米颗粒进行了表征。实验结果表明，当用氢气作为还原剂时，以低代树形分子为保护剂，通过优化还原条件，可成功制备尺寸稳定、均一的银纳米颗粒，其粒径为2.9±0.5 nm，且所制备的银纳米颗粒的粒径分布较窄。根据树形分子的理论尺寸与制备的银纳米颗粒的粒径关系，可推断出大多数的银纳米颗粒是由多个树形分子所包围而稳定存在。

Preparation of Ag Nanoparticles in the Presence of Low Generation PAMAM Dendrimer with Surface Ester Groups

Ag nanoparticles were prepared by reduction of AgNO₃ with H₂ in the presence of generation 1.5 poly(amidoamine) dendrimers with surface ester groups (G1.5-COOCH₃ PAMAM dendrimer). UV-Vis absorption, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM) and electron diffraction (ED) have been used to study the structure and characterization of the nanocomposites. By optimizing the conditions of the preparation, stable and uniform Ag nanoparticles of 2.9±0.5 nm were obtained. On the basis that the calculation diameter of G1.5-COOCH₃ PAMAM is smaller than the diameter of obtained Ag nanoparticles, it could be suggested that most of Ag nanoparticles were surrounded by G1.5-COOCH₃ PAMAM dendrimer.