纳米Cu2O/Ag复合材料的制备、表征和抗菌活性研究

通过溶胶-凝胶法制备了单分散性的球形纳米Cu2O,采用无还原剂的取代反应法在上面负载一层纳米Ag,制备了核壳结构的Cu2O/Ag纳米复合材料.利用透射电镜(TEM)分析了纳米Cu2O/Ag的形貌、并用X射线衍射测(XRD)X射线光电子能谱(XPS)分析了其物相组成,利用紫外-可见光谱(UV-Vis)和光致发光光谱(PL)研究了其光谱特征,用大肠杆菌和金黄色葡萄球菌作为测试菌研究Cu2O/Ag抑菌性能.结果表明,Cu2O平均直径为150 nm,表面纳米Ag粒子直径为7 nm,形成核壳结构Cu2O/Ag对大肠杆菌抑菌率为93 ;, 对金黄色葡萄球菌为95;.

Preparation,Characterization and Antibacterial Activity of Nano-Cu2O/Ag Composites

Monodisperse Cu2O colloidal spheres were produced by a sol-gel reaction process.The sub-micrometer sized Cu2O/Ag composite spheres with core-shell structure were obtained via galvanic replacement method.The as-prepared composites were characterized with transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-vis spectroscopy.Their antibacterial activities against Bacillus subtilis (B.subtilis)and Escherichia coli (E.coli) were also studied.The results show that the average size of Ag nanoparticles (NPs) and Cu2O in the composites is about 7 nm and 150 nm, respectively.Owing to the synergistic action of Cu2O and Ag NPs, the Cu2O/Ag composites show 93% antibacterial activity against E.coli, and the antibacterial rate can reach 95% against B.subtilis.