Preparation And Bacteriostatic Properties Of Carbon/Silver Composite Materials

Nano silver has the special effect of the nano-particles,including the high surfaceenergy and chemical activity. Thus the light, heat, sound, electrical, magnetic, andmechanical properties of nano-silver are very good, it has been widely applied in thefield of anti-static materials, the low-temperature superconducting materials,biosensors materials and antibacterial materials. Nano-silver is a good antibacterialmaterial because of a broad-spectrum antimicrobial properties, low drug resistanceand low cytotoxicity. However, nano-silver is easy to lose and thus lose antimicrobialproperties in practical application. Therefore we take advantages of the carrier to fixthe nano-silver in order to play a long-lasting antibacterial effect. Carbon-basedmaterials, related to carbon nanotubes and graphene in this paper, is a good choice asthe nano-silver carrier. Nanotubes and graphene themselves have a certain inhibitoryperformance and a high specific surface area, so there will be great research value touse them as the carrier of the nano-silver.Firstly, the original multi-walled carbon nanotubes are modified with differentmodification methods, including the mixed acid modify method and dopamine modifymethod. Carbon nanotubes modified by two methods are characterized using a varietyof testing methods.The synthesis conditions of the mixed acid modified carbonnanotubes/nanosilver composite were investigated. TEM and XPS results show thatmodified carbon-based material contains uniform nano-silver particles with theparticle diameter of about7nm.The carboxyl carbon nanotubes are further modified with dopamine.Modification effect is proved by the test of Fourier transform infrared (FTIR).Dopamine-coated carbon nanotubes by nano-silver composites are successfullyprepared on this basis, and its performance is tested.Graphene oxide is prepared by the improved hummers method. TEM imagesshow that the degree of dispersion of the graphene oxide is good. Using the graphene oxide as a carrier, graphene oxide by nanocrystalline silver composites aresuccessfully prepared. TEM images show that folds of graphene oxide are veryobvious and that uniform nano-silver are deposited on the surface of the grapheneoxide. Inhibition zone test shows that the composite material has good antibacterialproperties.Acidification dopamine-modified the carboxyl carbon nanotubes and grapheneoxide nano-silver particles are prepared in this article. Fourier transform infrared(FTIR), scanning electron microscopy (SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy (EDS), the X-ray diffraction pattern (XRD)and X-ray photoelectron spectroscopy (XPS) methods were used to characterize thecomposite.The antibacterial properties of the composite are investigated throughinhibition zone.The carbon-based composite material with high stability and good antibacterialsilver added will have a potential in the field of marine antifouling paint.