银纳米线的改进溶剂热法合成与表征

采用溶剂热法和晶种法相结合的改进方法,以硝酸银为银源,乙二醇为还原剂,聚乙烯吡咯烷酮为稳定剂和分散剂,制备银纳米颗粒晶种,进而在溶剂热环境中合成了高均匀性的银纳米线。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、和紫外-可见光分光光度计(UV-Vis)对产物的尺寸形貌、晶体结构以及光学性能进行了表征。结果表明,利用改进的溶剂热法制备的银纳米线具有较高的长径比,尺寸分布均匀,分散性良好,具有优异的等离激元共振吸收特性。

Preparation and Characterization of Silver Nanowires via an Improved Solvothermal Method

Uniform silver nanowires have been synthesized by the reduction of AgNO3 in the presence of polyvinyl pyrrolidone as surfactant and ethylene glycol as reducing agent through improved solvothermal method, wherein the silver nanoparticles were used as the crystal seeds. The morphology, structure and optical properties of silver nanowires have been characterized by X-ray diffractometer(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), and UV/Visible absorption spectrophotometry. Results indicate that, the silver nanowires, derived from the improved solvothermal approach, possesses high aspect ratios and uniform size distribution. In addition, the products are in a fine dispersion and exhibit obvious surface plasmon resonance characteristics.