石墨烯/银纳米复合材料的制备及抗菌性能研究

采用改进的Hummers法制备氧化石墨(GO),加入一定量的聚乙烯亚胺和硝酸银(PEI-Ag+)配位复合物,通过自组装法组装,利用硼氢化钠的还原性,制备石墨烯/银纳米复合材料。用紫外可见吸收光谱(UV-Vis)、红外吸收光谱(FT-IR)、X射线衍射(XRD)、循环伏安法(CV)、扫描电镜(SEM)、拉曼光谱(Raman)等手段对所制备的石墨烯/银纳米复合材料进行表征。以金黄色葡萄球菌和大肠杆菌为模型对纳米复合材料的抗菌性能进行研究。结果表明:银纳米粒子负载在石墨烯表面形成石墨烯/银纳米复合物材料,石墨烯/银纳米复合材料对金黄色葡萄球菌和大肠杆菌生长具有较好的抑制作用,且抗菌性能稳定。当石墨烯/银纳米复合材料浓度为4和15 mg/m L时,分别对金黄色葡萄球菌和大肠杆菌的抑菌效果好。

Synthesis of Graphene/Ag Nanocomposites and Their Antimicrobial Properties

The graphite oxide (GO) was synthesized by a modified Hummers method, and with adding a certain amount of PEI-Ag+ and using sodium borohydride as reducer, graphene/silver nanocomposites were prepared by a self-assembly method. The UV-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), cyclic voltammeter, scanning electronic microscope (SEM) and Raman spectroscopy were used to characterize graphene/silver nanocomposites. The antibacterial efficiency of graphene/silver nanocomposites was tested against E.coli and S.aureus. The results show that silver nanoparticles are distributed over the graphene sheet between layers. The graphene/silver nanocomposites have good and steady antimicrobial property against S.aureus and E.coli. When the concentrations of grapheme/Ag are 4 and 15 mg/mL, the antimicrobial property against S.aureus and E.coli is better, respectively.