摘要
通过在没食子酸与硝酸银的混合溶液中加入微量氯金酸,利用首先生成的纳米金对银离子还原的催化和成核作用,促进没食子酸与硝酸银反应制备了纳米银溶胶。研究了所得溶液的紫外可见吸收光谱特性,用HRTEM和EDX对纳米银颗粒的形貌和元素组成进行了表征和分析,并初步探讨了反应机理。实验结果表明,在优化的最佳条件下,用该法制备的纳米银最大吸收峰在420nm左右,颗粒呈球形,粒度均匀,单分散性好。反应中微量氯金酸的加入是促进没食子酸与硝酸银反应生成纳米银的必要条件之一。该法操作简单,反应快速,无需特殊设备。
The bright yellow nano-silver hydrosol was synthesized at 100 ℃by adding small amounts of chloroauric acid to a mixed solution of gallic acid and silver nitrate. The silver nanoparticles were characterized by UV-Visible absorption spectroscopy, high resolution transmission electron microscopy （HRTEM） and energy dispersion X-ray spectrometry （EDX）. The results show that the presence of small amounts of chloroauric acid is one of the most important factors, which can catalyze the reduction of Ag^＋ by gallic acid. The reaction mechanism is thought to be that the formed nanogold particles are acted as both crystal-core and catalyst to induce the reduction of silver ions by gallic acid. The method is simple, facile and fast. The prepared silver nanoparticles are close to sphere, monodispersed, symmetrical distributed with their average diameter of about 18 nm.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2007年第10期1683-1688,共6页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金资助项目(No.20675011)。
关键词
没食子酸
纳米银
氯金酸
催化
gallic acid
nano-silver
chloroauric acid
catalyse
