聚酰胺酸包覆银纳米粒子的制备及表征

Preparation and characteristic of PAA-stabilized silver nanoparticles

以硝酸银为原料,用N,N二甲基甲酰胺溶剂作还原剂,聚酰胺酸(poly amic acid,PAA)为稳定剂,制备金属银纳米粒子。利用红外光谱分析银纳米粒子的形成对PAA结构的影响;用X射线衍射确定银/PAA复合粉末中银粒子的结晶状态;用紫外可见吸收光谱实时检测不同PAA质量浓度的溶液中纳米粒子的等离子体共振吸收情况;用透射电镜观察银纳米粒子的形状和大小。结果表明:银纳米粒子的生成对PAA的分子结构几乎没有影响;银纳米粒子具有很好的结晶度;紫外可见吸收光谱出现明显的不对称双峰;银纳米粒子长大是奥斯特瓦尔成熟过程,制备的银纳米粒子具有较好的形貌,呈软团聚多晶态。

Silver nanoparticles with good monodispersity and well-dispersion were produced using AgNO3 as raw materials, N, N-dimethylformamide as reductive and poly amide acid （PAA） as stabilizer. FT-IR was used to study the effect of silver nanoparticle on the structure of PAA molecule. XRD was used to detect the crystalline state of silver partcles. UV-vis spectroscopy was used to test the absorptiometry. TEM was used to study the shape and size of silver nanoparticles. The results show that, the formation of silver nanoparticles has little effect on the structure of polyamide acid molecular; UV - visible absorption spectrum shows a significant asymmetry of bimodal; the growth of silver nanoparticles is by means of Ostwald ripening process, the silver nanoparticles is in softly-agglomerated polycrystalline state with better morphology.