Solvothermal Synthesis of Surface-Modified Graphene/C and Au-Fe 3 O 4 Nanomaterials for Antibacterial Applications

Abstract We have investigated synthesis of simultaneously surface-modified Graphene/C, and Au-Fe 3 O 4 nanomaterials by using the simple solvothermal method: synthesis was carried out inside stainless steel autoclave, under temperatures 150°C - 170°C and pressure 1.5-1.8 MPa. No gas was used, and no pollutants were produced during synthesis. Varied synthesis conditions (temperature, time and concentration of initial reagents) allow us control and achieving nanomaterials with different structure and properties. Solvothermal synthesis mechanism of above nanoparticles have been described and explained in this work. Structure, morphology and phase compositions of as-synthesized nanoparticles were thoroughly characterized and analyzed by X-ray photoelectron, Raman, high resolution transmission electron microscopy and energy dispersive X-ray analyses. ATR-FTIR spectra observed peaks at 1310-1335 cm -1 , characterizing V a asymmetric, and peaks at 1130-1160 cm -1 for V s symmetric valence vibrations for alkyl sulfone (-SO 2 ) functional groups, released from SLS (sodium lauryl sulfate) surfactant and modified the Graphene surface. Distinct antibacterial activity of Au-Fe 3 O 4 nanoparticles, increasing by increase in Au-Fe 3 O 4 NPs concentration was established by 3M E.coli Pertifilm count plates.