低代端酯基PAMAM树形分子存在下银纳米颗粒的制备  

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

作　　者：李国平[1] 罗运军[1] 李杰[1] 谭惠民[1] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081

出　　处：《无机化学学报》2005年第2期165-168,共4页Chinese Journal of Inorganic Chemistry

基　　金：教育部跨世纪优秀人才基金;国防科工委基础研究计划资助项目(No.J1500E002)

摘　　要：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),紫外鄄可见吸收光谱(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±0.5nm,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。Ag nanoparticles were prepared by reduction of AgNO3 with H-2 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.

关 键 词：树形分子 制备 纳米颗粒 尺寸稳定 酯基 粒径 氢气 PAMAM 电子衍射 透射 

分 类 号：O614[理学—无机化学] TQ132.32[理学—化学]