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Capping antibacterial Ag nanorods aligned on Ti interlayer by mesoporous TiO2 layer

Akhavan, O ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.surfcoat.2009.03.033
  3. Publisher: 2009
  4. Abstract:
  5. In this work, aligned and compact Ag nanorods capped by sol-gel mesoporous TiO2 layer were grown on Ti/Si(100) in order to be applied in antibacterial applications. The Ag nanorods with a high effective surface were grown by applying an electric field perpendicular to the surface of the Ag/Ti/Si thin film while it was being heat-treated at 700 °C in an Ar + H2 ambient. The grown silver nanorods had widths and lengths of 20-50 and 250-500 nm with an abundance in {100} facet, respectively. The TiO2 cap layer also had the specific surface area, the total pore volume and the pore diameter of 474 m2/g, 0.49 cm3/g and 8.0 nm, respectively. Antibacterial activities of the TiO2-capped Ag nanorods against E. coli bacteria were examined in the dark and under UV irradiation, and then compared to the corresponding activities of the TiO2-capped Ag thin film and the TiO2-capped Ag nanoparticles grown on the Ti layer. The Ag+ ion release measurements showed that the mesoporous and aqueous TiO2 cap layer can control the silver release process by inter-diffusion of water and silvers thorough its capillary structures, completely different from the ion release behavior of the silver nanorods not capped by the TiO2 layer. The results showed a strong and lasting antibacterial activity for the TiO2-capped Ag nanorods with 2.34 h- 1 for the relative rate of reduction of the number of viable bacteria. © 2009 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Ag nanoparticle ; Ag nanorods ; Anti-bacterial activity ; Antibacterial ; Cap layers ; E. coli ; Inter-diffusion ; Ion release ; Mesoporous ; Mesoporous TiO ; Pore diameters ; Relative rates ; Release process ; Silver nanorods ; TiO ; Titania thin films ; Total pore volume ; UV irradiation ; Bacteriology ; Electric fields ; Escherichia coli ; Gelation ; Nanoparticles ; Nanorods ; Organic polymers ; Thin film devices ; Thin films ; Titanium ; Titanium dioxide ; Titanium oxides ; Silver
  8. Source: Surface and Coatings Technology ; Volume 203, Issue 20-21 , 2009 , Pages 3123-3128 ; 02578972 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S025789720900293X