Graphene nanomesh by ZnO nanorod photocatalysts

Akhavan, O ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1021/nn1007429
  3. Publisher: 2010
  4. Abstract:
  5. Local photodegradation of graphene oxide sheets at the tip of ZnO nanorods was used to achieve semiconducting graphene nanomeshes. The chemically exfoliated graphene oxide sheets, with a thickness of ∼0.9 nm, were deposited on quartz substrates. Vertically aligned ZnO nanorod arrays with diameters of 140 nm and lengths of <1 μm were grown on a glass substrate by using a hydrothermal method. The graphene oxide sheets were physically attached to the tip of the ZnO nanorods by assembling the sheets on the nanorods. UV-assisted photodegradation of the graphene oxide sheets (with dimension of ∼5 × 5 μm) at a contact place with the ZnO nanorods resulted in graphene nanomeshes with a pore size of ∼200 nm. The graphene nanomeshes prepared by using the photocatalytic property of the ZnO nanorods contained smaller oxygen-containing carbonaceous bonds and higher defects as compared to the as-prepared graphene oxide sheets. When chemical reduction of the graphene nanomeshes by hydrazine was used, the oxygen bonds of the nanomeshes more decreased while their graphitization increased. Based on X-ray photoelectron spectroscopy at low binding energies, the graphene nanomeshes reduced by hydrazine exhibited as a broad sheet a p-type semiconductor with an ∼1.2 eV energy gap between the valence band and the Fermi level
  6. Keywords:
  7. Semiconductor ; ZnO nanorods ; Carbon nanostructures ; Chemical reduction ; Glass substrates ; Hydrothermal methods ; Nanomesh ; Oxygen bonds ; P type semiconductor ; Photocatalytic property ; Quartz substrate ; Vertically aligned ; ZnO nanorod ; Binding energy ; Graphene ; Graphite ; Hydrazine ; Oxide minerals ; Oxygen ; Photocatalysis ; Photodegradation ; Quartz ; Substrates ; X ray photoelectron spectroscopy ; Zinc oxide ; Nanorods
  8. Source: ACS Nano ; Volume 4, Issue 7 , 2010 , Pages 4174-4180 ; 19360851 (ISSN)
  9. URL: http://pubs.acs.org/doi/abs/10.1021/nn1007429