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Synthesis of titania/carbon nanotube heterojunction arrays for photoinactivation of E. coli in visible light irradiation

Akhavan, O ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.carbon.2009.07.046
  3. Publisher: 2009
  4. Abstract:
  5. TiO2/multi-wall carbon nanotube (MWNT) heterojunction arrays were synthesized and immobilized on Si(0 0 1) substrate as photocatalysts for inactivation of Escherichia coli bacteria. The vertically aligned MWNT arrays were grown on ∼5 nm Ni thin film deposited on the Si by using plasma enhanced chemical vapor deposition at 650 °C. Then, the MWNTs were coated by TiO2 using dip-coating sol-gel method. Post annealing of the TiO2/MWNTs at 400 °C resulted in crystallization of the TiO2 coating and formation of Ti-C and Ti-O-C carbonaceous bonds at the heterojunction. The visible light-induced photoinactivation of the bacteria increased from MWNTs to TiO2 to TiO2/MWNTs, in which the bacteria could even slightly breed on the MWNTs. In addition, the TiO2/MWNTs annealed at 400 °C showed a highly improved antibacterial activity than the TiO2/MWNTs annealed at 100 °C. The excellent visible light-induced photocatalytic efficiency of the TiO2/MWNTs/Si film annealed at 400 °C was attributed to formation of the carbonaceous bonds at the heterojunction, in contrast to the 100 °C annealed TiO2/MWNTs/Si sample which had no such effective bonds. © 2009 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Anti-bacterial activity ; Dip coating ; E. coli ; Escherichia coli bacteria ; Multi-wall carbon nanotubes ; Ni thin films ; Photocatalytic efficiency ; Photoinactivation ; Post annealing ; Si(0 0 1) ; Sol-gel methods ; TiO ; Vertically aligned ; Visible light ; Visible-light irradiation ; Annealing ; Bacteriology ; Carbon nanotubes ; Deposition ; Escherichia coli ; Gelation ; Light transmission ; Multiwalled carbon nanotubes (MWCN) ; Photocatalysis ; Plasma deposition ; Semiconducting silicon compounds ; Sol-gel process ; Synthesis (chemical) ; Plasma enhanced chemical vapor deposition
  8. Source: Carbon ; Volume 47, Issue 14 , 2009 , Pages 3280-3287 ; 00086223 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0008622309004813