Synthesis of silver/montmorillonite nanocomposites using γ-irradiation

材料科学 硝酸银 核化学 纳米复合材料 蒙脱石 辐照 银纳米粒子 透射电子显微镜 傅里叶变换红外光谱 粒径 扫描电子显微镜 水溶液 纳米颗粒 化学工程 分析化学(期刊) 纳米技术 化学 复合材料 有机化学 物理 核物理学 工程类
作者
Kamyar Shameli,Mansor Bin Ahmad,Wan Zin Yunis,Nor Azowa Ibrahim,Majid Darroudi,Yadollah Gharayebi,Sajjad Sedaghat
出处
期刊:International Journal of Nanomedicine [Dove Medical Press]
卷期号:Volume 5: 1067-1077 被引量:108
标识
DOI:10.2147/ijn.s15033
摘要

Silver nanoparticles (Ag-NPs) were synthesized into the interlamellar space of montmorillonite (MMT) by using the γ-irradiation technique in the absence of any reducing agent or heat treatment. Silver nitrate and γ-irradiation were used as the silver precursor and physical reducing agent in MMT as a solid support. The MMT was suspended in the aqueous AgNO(3) solution, and after the absorption of silver ions, Ag(+) was reduced using the γ-irradiation technique. The properties of Ag/MMT nanocomposites and the diameters of Ag-NPs were studied as a function of γ-irradiation doses. The interlamellar space limited particle growth (d-spacing [d(s)] = 1.24-1.42 nm); powder X-ray diffraction and transmission electron microscopy (TEM) measurements showed the production of face-centered cubic Ag-NPs with a mean diameter of about 21.57-30.63 nm. Scanning electron microscopy images indicated that there were structure changes between the initial MMT and Ag/MMT nanocomposites under the increased doses of γ-irradiation. Furthermore, energy dispersive X-ray fluorescence spectra for the MMT and Ag/ MMT nanocomposites confirmed the presence of elemental compounds in MMT and Ag-NPs. The results from ultraviolet-visible spectroscopy and TEM demonstrated that increasing the γ-irradiation dose enhanced the concentration of Ag-NPs. In addition, the particle size of the Ag-NPs gradually increased from 1 to 20 kGy. When the γ-irradiation dose increased from 20 to 40 kGy, the particle diameters decreased suddenly as a result of the induced fragmentation of Ag-NPs. Thus, Fourier transform infrared spectroscopy suggested that the interactions between Ag-NPs with the surface of MMT were weak due to the presence of van der Waals interactions. The synthesized Ag/MMT suspension was found to be stable over a long period of time (ie, more than 3 months) without any sign of precipitation.
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