作　　者： ; ; ; ; ; ;

机构地区： 河南大学

出　　处： 《物理化学学报》 2011年第3期722-728,共7页

摘　　要： 采用液相还原法,以单宁酸为还原剂,聚乙烯吡咯烷酮(PVP)为修饰剂制备出了水溶性的表面修饰Ag纳米颗粒.通过X射线粉末衍射仪(XRD)、透射电子显微镜(TEM)、紫外-可见吸收分光光度计(UV-Vis)、傅里叶变换红外(FTIR)光谱仪等对所得样品的形貌和结构进行了表征.采用肉汤稀释法测试了样品的抗菌性能,考察了样品在水相中的分散稳定性,提出了PVP修饰Ag纳米颗粒的形成机理.结果表明所制备的样品具有Ag的面心立方晶体结构,平均粒径为15-17nm.样品在水相中能长时间稳定分散;对埃希氏大肠杆菌(E.coli)、金黄色葡萄球菌(S.aureus)具有明显的抗菌作用.操作简便、条件温和的制备方法易于在工业规模上放大;试剂无毒,使得所制备的PVP修饰Ag纳米颗粒作为抗菌剂具有良好的应用前景. Water-soluble surface modified silver nanoparticles were synthesized by liquid phase reduction with tannic acid as the reductant and polyvinyl pyrrolidone （PVP） as the surface modification agent.The structure and morphology of the as-synthesized powders were investigated by X-ray powder diffraction （XRD）,transmission electron microscopy （TEM）,ultraviolet-visible （UV-Vis） absorption spectroscopy,and Fourier-transform infrared （FTIR） spectrometry.The antibacterial activity of the water-soluble Ag nanoparticles against Escherichia coli （E.coli） and Staphylococcus aureus （S.aureus） was investigated by broth dilution.The stable dispersion duration of the as-synthesized Ag nanoparticles in water was also determined.A mechanism for PVP modified Ag nanoparticle formation is proposed.The results show that the as-synthesized PVP modified Ag nanoparticles have a face-centered cubic crystalline structure.The average diameter of the Ag nanoparticles ranges from 15 to 17 nm.The assynthesized powders have good solubility in water over a long period of time.PVP modified Ag nanoparticles exhibit good antibacterial properties against E.coli and S.aureus.This simple and mild preparation method can be easily increased to an industrial scale process and,therefore,PVP modified Ag nanoparticles are potentially a new type of antibacterial.

关 键 词： 银纳米颗粒 水溶性 表面修饰 绿色无毒 抗菌性

领　　域： [理学] [理学]