PVP还原制备花朵状银纳米颗粒

Synthesis of flower-like silver nanoparticles by polyvinyl pyrrolidone(PVP) reduction

以硝酸银为前驱体,聚乙烯吡咯烷酮为还原剂和保护剂,制备出了花朵状纳米银。利用紫外可见吸收光谱(UV-Vis)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)及傅里叶红外光谱仪(FT-IR)等对其进行了分析表征。研究表明,制得的Ag纳米颗粒属于面心立方结构,随着反应温度的升高,Ag纳米颗粒形貌由类球形到立方体形、薄片形、花朵形转变,溶液中的Ag+会得到PVP分子内酰胺基中N的给电子,使Ag+获得电子而转化为Ag。

The flower-like silver nanoparticles were synthesizecl using silver nitrate （AgNO3） as precursor and polyvinyl pyrrolidone （PVP） as reductive and protective agent. Surface characteristics of the silver nanoparticles were analyzed by UV-Vis absorption spectroscopy （UV-vis）, Scanning Electron Microscope （SEM）, X-ray Diffraction （XRD）, Fourier transform infrared （FT-IR）. The result showed that silver nanoparticles belong to face-centered cubic structure and with the temperature increasing, the form will transform from spherical to cubic and then to slice shape, flower-like silver nanoparticle. Ag ^＋ in the solution would be reduced to Ag by amino N in PVP.