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Heterostructured TiO2/SiO2/γ-Fe2O3/rGO coating with highly efficient visible-light-induced self-cleaning properties for metallic artifacts

Mokhtarifar, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1021/acsami.0c06792
  3. Publisher: American Chemical Society , 2020
  4. Abstract:
  5. A novel nanohybrid composite of TiO2, SiO2, γ-Fe2O3, and reduced graphene oxide (TiO2@Si:Fe:rGO) is fabricated by the sol-gel method. The properties of the coated film were examined by structural and self-cleaning analyses using simulated discoloration/soiling and roofing tests. The fabricated transparent TiO2@Si:Fe:rGO composite showed excellent photoactivity and wettability, behaving well in self-cleaning applications. The addition of SiO2 improved the crystalline structure and surface hydroxylation of TiO2 nanoparticles. γ-Fe2O3 decreased the recombination rate of e-/h+ pairs, and significantly improved photocatalytic activity under visible light. Moreover, rGO sheets as excellent electron acceptors and transporters also reduced recombination, as well as affected wettability, achieving superhydrophilicity under irradiation. The coated substrate showed excellent resistance to simulated acid rain and significantly preserved the substrate from soiling in roofing tests. © 2020 American Chemical Society
  6. Keywords:
  7. Reduced graphene oxide ; Self-cleaning ; SiO2 ; Superhydrophilic photocatalyst ; TiO2 ; Transparent coating ; γ-Fe2O3 ; Acid rain ; Acid resistance ; Cleaning ; Graphene ; Hematite ; Light ; Roofs ; Silica ; Silicon ; SiO2 nanoparticles ; Sol-gel process ; Sol-gels ; Superhydrophilicity ; TiO2 nanoparticles ; Titanium dioxide ; Wetting ; Coated substrates ; Crystalline structure ; Nano-hybrid composites ; Recombination rate ; Self-cleaning properties ; Simulated acid rains ; Surface hydroxylations ; Visible light induced ; Photocatalytic activity
  8. Source: ACS Applied Materials and Interfaces ; Volume 12, Issue 26 , 3 June , 2020 , Pages 29671-29683
  9. URL: https://pubs.acs.org/doi/10.1021/acsami.0c06792