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Visible light photoinactivation of bacteria by tungsten oxide nanostructures formed on a tungsten foil

Ghasempour, F ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2015.01.217
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. Antibacterial activity of tungsten oxide nanorods/microrods were studied against Escherichia coli bacteria under visible light irradiation and in dark. A two-step annealing process at temperatures up to 390 °C and 400-800 °C was applied to synthesize the tungsten oxide nanorods/microrods on tungsten foils using KOH as a catalyst. Annealing the foils at 400 °C in the presence of catalyst resulted in formation of tungsten oxide nanorods (with diameters of 50-90 nm and crystalline phase of WO3) on surface of tungsten foils. By increasing the annealing temperature up to 800 °C, tungsten oxide microrods with K2W6O19 crystalline phase were formed on the foils. The WO3 nanorods showed a strong antibacterial property under visible light irradiation, corresponding to >92% bacterial inactivation within 24 h irradiation at room temperature, while the K2W6O19 microrods formed at 800 °C could inactivate only ∼45% of the bacteria at the same conditions
  6. Keywords:
  7. Annealing ; Bacteria ; Catalysts ; Crystalline materials ; Escherichia coli ; Irradiation ; Light ; Nanorods ; Nanostructures ; Oxides ; Photocatalysts ; Tungsten compounds ; Annealing temperatures ; Anti-bacterial activity ; Antibacterial materials ; Antibacterial properties ; E. coli ; Escherichia coli bacteria ; Tungsten oxide ; Visible-light irradiation ; Tungsten
  8. Source: Applied Surface Science ; Volume 338 , May , 2015 , Pages 55-60 ; 01694332 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0169433215002597