【摘要】 首先用改进的Hummers法制备氧化石墨烯(GO);其次用原位还原法将银氨溶液中的Ag纳米粒子通过还原剂葡萄糖和GO复合,获得Ag/GO胶体;最后在真空干燥条件下得到Ag/GO涂层,并用真空阶梯热还原技术制备Ag/还原氧化石墨烯(rGO)涂层。利用X射线衍射、扫描电子显微镜、透射电子显微镜等方法对膜样品结构形貌进行表征,并用润湿角测量仪和抑菌环方法分别检测样品的亲/疏水性和抗菌性能。实验结果表明:石墨烯基膜材料与基底结合较好,Ag纳米粒子在石墨烯片层间呈球形均匀分布,粒径为20～50nm;纯GO和rGO膜表面未见菌落,大肠杆菌与金黄色葡萄球菌均未出现有效抑菌环;复合Ag纳米粒子后,涂层的抑菌效果得到显著提高;与Ag/GO复合膜相比,Ag/rGO复合膜呈更强的抗菌活性,即低温退火有助于提高石墨烯基复合涂层的抗菌性能。更多还原

【Abstract】 Firstly,graphene oxide(GO)was prepared by modified Hummers method.Secondly,Ag/GO colloids were synthesized from GO and using glucose as reducing agent to reduce silver nanoparticles in silver ammonia solution.Finally,Ag/GO coating was obtained under vacuum drying condition,and Ag/reduced graphene oxide(rGO)coating was prepared by vacuum step-by-step thermal reduction technology.The structure and morphology of the films were characterized by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The hydrophilic/hydrophobic and antibacterial properties of the samples were tested by wetting angle tester and inhibition zone method.The results show that the graphene-based coatings have a good combination with the substrate,Ag nanoparticles are spherical shape and uniformly distributed between the layers of graphene sheets,and the particle size range is 20—50 nm.No bacterial was observed on the surface of GO and rGO films,and no clear zone of inhibition is found in E.coli and S.aureus.Compared with the Ag/GO composite film,Ag/rGO composite film has stronger antibacterial activity,and low temperature annealing is helpful to improve the antibacterial performance of graphene-based composite coating.更多还原