Abstract

We reported a green method for the synthesis of silver nanoparticles (AgNPs) using Gallic acid (GA) as both reducing and capping agent. The effect of pH and GA concentration was investigated on the average size and stability. The synthesized NPs were characterized by UV-Vis spectroscopy, DLS and zeta potential. The pH of 9 for AgNPs synthesis was optimum in order to formation of more NPs with the smaller average size. Then, the effect of GA concentration on average size and stability of AgNPs at optimum pH were investigated. A large number of NPs with smaller average size were obtained at the GA concentration of 7 mM. Zeta potential values indicated that AgNPs had good stability at all of conditions. The characterization through XRD and TEM techniques inferred that the NPs synthesized under optimum conditions were metallic silver with a FCC crystalline structure and the average size of 5.77 nm, respectively.

摘要

我们报道了一种使用没食子酸 (GA) 作为还原剂和封端剂合成银纳米粒子 (AgNPs) 的绿色方法。研究了 pH 值和 GA 浓度对平均尺寸和稳定性的影响。合成的纳米颗粒通过紫外-可见光谱、DLS 和 zeta 电位进行表征。AgNPs 合成的最佳 pH 值为 9，以便形成更多平均尺寸较小的 NPs。然后，研究了 GA 浓度对最佳 pH 条件下 AgNPs 平均尺寸和稳定性的影响。在 7 mM 的 GA 浓度下获得了大量平均尺寸较小的 NP。Zeta电位值表明AgNPs在所有条件下都具有良好的稳定性。