鞣酸还原法制备多形态纳米银

Shape Controllable Synthesis of Silver Nanostructures by a Facile Tannic Acid Reducing Approach

鞣酸还原AgNO3,得到不同形貌的银纳米结构体。反应物滴加的先后顺序及表面活性剂PVP的加入与否对生成物形貌的影响最大。无表面活性剂PVP加入时,改变鞣酸及银氨配离子的滴加顺序分别生成六边形及少量线状纳米银,平均粒径为55nm。加入表面活性剂PVP,易于生长银纳米线。利用XRD、TEM、FT-IR对其进行性能表征。并对其多形貌产生的原因进行了初步探讨。

Polymorphous silver nanostructures were synthesized by reducing silver nitrate with tannic acid. The different dropping order of the reagent and the addition of surfactant PVP had significantly effected on the shape of silver nanostructures. We got hexagon-like silver nano-particles through dropletting tannic acid to [Ag（NH3）2]^＋, While dropletting [Ag（NH3）2]^＋ to tannic acid, we got a little silver nanowire. With the addition of surfactant PVP, we got silver nanowire easily. The product was characterized by X-ray diffraction（XRD）, transmission electron microscopy （TEM）, FT-IR spectrum. The formation mechanism of the different Ag nanostructures was explained.