Atanu NASKAR, Hasmat KHAN, Sunirmal JANA; Cobalt Doped ZnO–Graphene Nanocomposite: Synthesis, Characterization and Antibacterial Activity on Water Borne Bacteria; Advanced Nano-Bio-Materials and Devices; 2017:1(4):182-190

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This work reports on successful one pot surfactant free in-situ synthesis of cobalt doped ZnO-chemically converted graphene (CCG) nanocomposite (CZG) by adopting a low temperature solution process utilizing zinc acetate dihydrate and graphene oxide with varying content of cobalt acetate tetrahydrate (upto 10% Co with respect to Zn) in the precursor medium. The materials properties were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), FTIR and Raman spectral analyses. The presence of ZnO nanoparticles (NPs) in the nanocomposites was confirmed by XRD and TEM studies. The TEM study revealed the uniform distribution of hexagonal ZnO in the CCG matrix. The existence of chemical interaction / complexation between CCG with ZnO/Zn2+ of the samples was confirmed by FTIR and Raman spectral analyses. The antibacterial activity was measured on Escherichia coli and Staphylococcus aureus as water borne bacteria to examine the efficiency of the nanocomposite towards killing the bacterial cells. Among the nanocomposites, 5% Co doped sample showed best antibacterial activity against the microorganisms. This synthesis strategy could open an avenue of Co doped other metal oxide-CCG nanocomposites for biomedical applications.