聚酰胺酸包覆银纳米粒子的制备及表征

Fabrication and characterization of PAA-stabilized silver nanoparticles

以N，N-二甲基甲酰胺溶剂作为还原剂，聚酰胺酸（poly（amideacid），PAA）为稳定剂，制备金属银纳米粒子。利用红外光谱分析仪研究银纳米粒子的形成对PAA结构的影响；通过X射线衍射分析确定Ag／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；用透射电镜分析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 by a soft, convenient method on the reduction of silver nitrate with N, N-dimethylformamide in the presence of poly （amide acid） （PAA） as stabilizer. The FT-IR was used to study the effect of formation of nanoparticles on the structure of PAA molecule; Using XRD to analyze the crystalline state of silver, which is in the composite film of Ag/PAA; The ultraviolet-visible absorption spectrum was used to detect the resonance absorption of nanoparticles plasma in the solution with different PAA mass concentration; The shape and size of the silver nanoparticles were studied by TEM. The results show that, the formation of silver nanoparticles has little effect on the structure of polyamide acid molecular; the degree of crystalinity is higher for fabricated silver nanoparticles, ultraviolet-visible absorption spectrum shows a significant asymmetry twin peaks; the growth of silver nanoparticles is by means of ostwald ripening process, the prepared silver nanoparticles is in softly-agglomerated polycrystalline state and with better morphology.