纳米银的置换反应制备及其表征

通过对纳米银的制备和结构表征,研究贵金属纳米材料的制备方法和纳米结构。采用硝酸银和锌反应置换银纳米粒子,与传统化学还原法相比,工艺简单,无需添加保护剂和活性剂。采用光学显微镜、XRD、SEM、TEM、SAED等手段,表征纳米材料的尺寸、形貌、组成和晶体结构。结果表明,反应所得的产物为银枝晶结构,面心立方晶体。每个银枝晶都由主干、二次分枝、三次分枝组成,具有自相似性。

Synthesis and characterization of nanostructured silver prepared by replacement reaction

Dendritic nanostructured silver is prepared using the replacement reaction method with AgNO3, zinc and water as precursors. Comparing with traditional reaction method, this technique is simple and doesn’t need any additive. Optical microscopy, XRD, SEM, TEM and SAED are used to systemically characterize the morphology and structure of silver nanostructures. The results indicate that the microstructure of silver is dendrite with FCC structure, which is composed of trunk, branch and leave. The structure has self-similarity.