Green synthesis of gold and silver nanoparticles using Hibiscus rosa sinensis
Green synthesis of gold and silver nanoparticles using Hibiscus rosa sinensis
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DOI：
10.1016/j.physe.2009.11.081
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发表时间：
2010-03-01
影响因子：
3.3
通讯作者：
Philip, Daizy
中科院分区：
文献类型：
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作者：
Philip, Daizy
报道了利用芙蓉叶提取物生物合成不同形状的金、银纳米颗粒。这是一种简单、经济、长时间稳定、可重复的室温水相合成方法，可获得金和银纳米粒子的自组装。通过改变反应介质中金属盐与萃取物的比例，可以调节金纳米颗粒的大小和形状。反应介质pH值的变化会产生不同形状的银纳米颗粒。采用紫外可见、透射电镜（TEM）、x射线衍射（XRD）和红外光谱（FTIR）对所制得的纳米颗粒进行了表征。在（1 1 1）、（2 0 0）、（2 0 0）、（2 0 0）、（3 1 1）面对应的XRD谱图中，电子衍射（SAED）区域中出现明亮的圆形斑点，高分辨率TEM图像中出现清晰的晶格条纹，证实了fcc结构中纳米颗粒的结晶性。红外光谱分析发现，金纳米粒子与胺基结合，银纳米粒子与羧酸离子结合。(C) 2009 Elsevier B.V.版权所有
Biological synthesis of gold and silver nanoparticles of various shapes using the leaf extract of Hibiscus rosa sinensis is reported. This is a simple, cost-effective, stable for long time and reproducible aqueous room temperature synthesis method to obtain a self-assembly of Au and Ag nanoparticles. The size and shape of Au nanoparticles are modulated by varying the ratio of metal salt and extract in the reaction medium. Variation of pH of the reaction medium gives silver nanoparticles of different shapes. The nanoparticles obtained are characterized by UV-vis, transmission electron microscopy (TEM), X-ray diffraction (XRD) and FTIR spectroscopy. Crystalline nature of the nanoparticles in the fcc structure are confirmed by the peaks in the XRD pattern corresponding to (1 1 1), (2 0 0), (2 2 0) and (3 1 1) planes, bright circular spots in the selected area electron diffraction (SAED) and clear lattice fringes in the high-resolution TEM image. From FTIR spectra it is found that the Au nanoparticles are bound to amine groups and the Ag nanoparticles to carboxylate ion groups. (C) 2009 Elsevier B.V. All rights reserved.