芦荟叶提取物绿色制备单分散纳米金及其性能研究

Green synthesis and characterization monodisperse gold nanoparticles using Aloe vera leaf extract

摘要:

本文以芦荟叶提取液为还原剂和稳定剂,成功地制备了小粒径、球状的金纳米粒子。在这种方法中,简单的芦荟叶提取液和金源混合,没有使用有毒试剂,因此该方法是一种生态友好的合成纳米金的方法。混合溶液的颜色从浅黄色变到紫色,表明生成了纳米金粒子。采用紫外-可见吸收光谱(UV-vis)、激光粒径分析仪(DLS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FT-IR)、X-射线衍射(XRD)等方法对合成的纳米金粒子进行了表征和性能测试。紫外-可见光谱的吸收峰再次表明金纳米颗粒的形成。XRD分析表明所生成的纳米我金具有高度结晶性。TEM和SEM表明纳米金颗粒呈球形,粒径分布在20 nm到60 nm之间。FT-IR证实了金纳米粒子提取物所保护,使其不发生团聚和氧化。论文研究了反应温度、氯金酸溶液和提取物的用量对纳米金粒径的影响。结果表明,这些参数在金纳米粒子的合成中起着重要的作用。

Abstract:

By using Aloe vera leaf extract as both reducing and stabilizing agent, spherical and small size gold nanoparticles were successfully synthesized. The method is a simple, straightforward and eco-friendly approach because of absence of toxic reagent and the neutral pH conditions. The performance and characterization of synthesized gold nanoparticles were examined by UV-visible absorption spectroscopy (UV-vis), dynamic light scattering (DLS), Scanning electron microscope (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and powder X-ray diffraction (XRD). The change of color and the absorbance peak in UV-vis spectroscopy indicated the formation of gold nanoparticles. The XRD showed that the particles were highly crystalline in nature. The TEM and SEM illustrated the particles were spherical in shape a narrowly distribution from 20 nm to 60 nm. The FT-IR proved that the gold nanoparticles were capped with extracts, keeping them from agglomeration and oxidation. The effect of reaction temperature, amount of chloroauric acid solution and extracts was also studied. The results display that these parameters play important roles in the generation of gold nanoparticles.