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  4. Effect of the spectral properties of TiO2, Cu, TiO2/Cu sputtered films on the bacterial inactivation under low intensity actinic light
 
research article

Effect of the spectral properties of TiO2, Cu, TiO2/Cu sputtered films on the bacterial inactivation under low intensity actinic light

Baghriche, O.
•
Rtimi, S.  
•
Pulgarin, C.  
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2012
Journal of Photochemistry and Photobiology A

Bacterial inactivation by TiO2, Cu and TiO2/Cu DC-magnetron sputtered thin films was systematically investigated in the dark and under low intensity visible/actinic light. Low intensity actinic light led to a fast 6log10 (complete) bacterial inactivation within the minute range. The TiO2/Cu bifunctional composite films led to the fastest bacterial inactivation. The Cu sputtered on the TiO2 enabled the absorption of visible light by the supported film and triggered a photo-induced IFCT effect from TiO2 to the Cu/Cu-ions. Evidence for a direct relation between the films optical absorption obtained by diffuse reflection spectroscopy (DRS) and the bacterial inactivation kinetics (CFU) is presented. The film microstructure was characterized by X-ray fluorescence (XRF) and X-ray photoelectron spectroscopy (XPS). The Tiand Cu-ions in solution were followed by inductive coupled plasma spectroscopy (ICPS). The small amount of Cu-ions determined by ICPS provide the evidence for an oligodynamic effect during bacterial inactivation. The Cu-redox changes and the ratio of the oxidized C /reduced C species were determined by XPS within the bacterial inactivation time.

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Type
research article
DOI
10.1016/j.jphotochem.2012.10.011
Web of Science ID

WOS:000314259100007

Author(s)
Baghriche, O.
Rtimi, S.  
Pulgarin, C.  
Sanjines, R.
Kiwi, J.
Date Issued

2012

Publisher

Elsevier

Published in
Journal of Photochemistry and Photobiology A
Volume

251

Start page

50

End page

56

Subjects

Bacterial inactivation

•

Actinic light

•

Cu-sputtering

•

Cu-cotton films

•

XPS

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GPAO  
Available on Infoscience
November 8, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/86734
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