焦性没食子酸还原制备纳米银

Preparation of silver nanoparticles using pyrogallic acid as reducing agent

以三聚磷酸钠为保护剂,用焦性没食子酸还原硝酸银得到了纳米银溶胶。利用X射线衍射、紫外-可见吸收光谱、透射电镜、粒度分析对得到的纳米银溶胶进行了表征。结果表明,通过改变体系中保护剂的含量、反应时间和反应温度,制备了平均粒径分别为15、17、22、25、26nm的均匀球形纳米银;用不同的焦性没食子酸衍生物(没食子酸甲酯和没食子酸月桂酯)作还原剂分别得到了多形貌纳米银和平均粒径为7nm且尺寸均一的球形纳米银。

Silver nanocolloids were prepared by reducing AgNOa with pyrogallic acid under the protection of sodium tripolyphosphate. The synthesized silver nanoparticles were characterized by X-ray powder diffraction, UV-visible spectroscopy,transmission electron microscopy and particle size distribution analysis. Results showed that uniform silver nanospheres with different diameters（15,17,22,25,26nm） were obtained by adjusting capping agent contents, reaction time and temperature. Moreover, silver nanocrystats with multimorphologies and silver nanospheres with an average diameter of 7nm were acquired by adopting gallicin and dodecyl gallate as reducing agents respectively.