Biosynthesis of gold and silver nanoparticles using Emblica officinalis fruit extract, their phase transfer and transmetallation in an organic solution
Biosynthesis of gold and silver nanoparticles using Emblica officinalis fruit extract, their phase transfer and transmetallation in an organic solution
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DOI：
10.1166/jnn.2005.184
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发表时间：
2005-10-01
影响因子：
--
通讯作者：
Sastry, M
中科院分区：
文献类型：
--
作者：
Ankamwar, B;Damle, C;Sastry, M
生物合成纳米材料的设计、合成和表征已经成为一个重要的研究领域。本文报道了以番荔枝果实提取物为还原剂的胞外合成纳米银和纳米银的方法，将纳米银和银的相转移到有机溶液中，以及疏水的银纳米粒子与疏水的氯金酸盐离子的跨金属反应。用余甘子提取液处理硫酸银和氯金酸水溶液时，银离子和氯金酸离子被迅速还原，形成了高度稳定的银和金纳米粒子。透射电子显微镜分析表明，银纳米粒子和金纳米粒子的尺寸分别为10~20 nm和15~25 nm。然后用阳离子表面活性剂十八胺将合成的银和金纳米颗粒转移到有机溶液中。疏水的银纳米粒子与疏水的氯金酸盐离子在氯仿中发生金属转移反应，形成金纳米粒子。
The design, synthesis and characterization of biologically synthesized nanomaterials have become an area of significant interest. In this paper, we report the extracellular synthesis of gold and silver nanoparticles using Emblica Officinalis (amla, Indian Gooseberry) fruit extract as the reducing agent to synthesize Ag and Au nanoparticles, their subsequent phase transfer to an organic solution and the transmetallation reaction of hydrophobized silver nanoparticles with hydrophobized chloroaurate ions. On treating aqueous silver sulfate and chloroauric acid solutions with Emblica Officinalis fruit extract, rapid reduction of the silver and chloroaurate ions is observed leading to the formation of highly stable silver and gold nanoparticles in solution. Transmission Electron Microscopy analysis of the silver and gold nanoparticles indicated that they ranged in size from 10 to 20 nm and 15 to 25 nm respectively. Ag and Au nanoparticles thus synthesized were then phase transferred into an organic solution using a cationic surfactant octadecylamine. Transmetallation reaction between hydrophobized silver nanoparticles and hydrophobized chloroaurate ions in chloroform resulted in the formation of gold nanoparticles.