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Effect of graphene oxide nanosheets on visible light-assisted antibacterial activity of vertically-aligned copper oxide nanowire arrays

Kiani, F ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcis.2018.03.013
  3. Publisher: Academic Press Inc , 2018
  4. Abstract:
  5. In the present work, the effect of graphene oxide (GO) nanosheets on the antibacterial activity of CuO nanowire arrays under visible light irradiation is shown. A combined thermal oxidation/electrophoretic deposition technique was employed to prepare three-dimensional networks of graphene oxide nanosheets hybridized with vertically aligned CuO nanowires. With the help of standard antibacterial assays and X-ray photoelectron spectroscopy, it is shown that the light-activated antibacterial response of the hybrid material against gram-negative Escherichia coli is significantly improved as the oxide functional groups of the GO nanosheets are reduced. In order to explore the physicochemical mechanism behind this behavior, ab-initio simulations based on density functional theory were performed and the effect of surface functional groups and hybridization were elucidated. Supported by the experiments, a three-step photo-antibacterial based mechanism is suggested: (i) injection of an electron from CuO into rGO, (ii) localization of the excess electron on rGO functional groups, and (iii) release of reactive oxygen species lethal to bacteria. Activation of new photoactive and physical mechanisms in the hybrid system makes rGO-modified CuO nanowire coatings as promising nanostructure devices for antimicrobial applications in particular for dry environments. © 2018 Elsevier Inc
  6. Keywords:
  7. Antibacterial surface ; Copper oxide nanowire ; Graphene oxide ; Photocatalytic activation ; Chemical activation ; Density functional theory ; Escherichia coli ; Graphene ; Hybrid materials ; Hybrid systems ; Nanosheets ; Thermooxidation ; X ray photoelectron spectroscopy ; Antibacterial surfaces ; Copper oxide nanowires ; Graphene oxide nanosheets ; Photo-catalytic ; Physico-chemical mechanisms ; Surface functional groups ; Three-dimensional networks ; Visible-light irradiation ; Copper oxides ; Copper oxide nanoparticle ; Functional group ; Nanosheet ; Nanowire ; Reactive oxygen metabolite ; Antiinfective agent ; Cuprous oxide ; Nanomaterial ; Oxide ; Ab initio calculation ; Absorption spectroscopy ; Antibacterial activity ; Article ; Controlled study ; Hybridization ; In vitro study ; Nanofabrication ; Nonhuman ; photoactivation ; Physical chemistry ; Priority journal ; Scanning electron microscopy ; Surface property ; Synthesis ; Transmission electron microscopy ; X ray diffraction ; Chemistry ; Drug effect ; Human ; Metabolism ; Oxidation reduction reaction ; Photochemistry ; Anti-Bacterial Agents ; Catalysis ; Computer Simulation ; Copper ; Electron Transport ; Escherichia coli ; Graphite ; Humans ; Light ; Nanostructures ; Nanowires ; Oxidation-Reduction ; Oxides ; Particle Size ; Photochemical Processes ; Reactive Oxygen Species ; Surface Properties
  8. Source: Journal of Colloid and Interface Science ; Volume 521 , 2018 , Pages 119-131 ; 00219797 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0021979718302558