期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 251, 期 -, 页码 50-56出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2012.10.011
关键词
Bacterial inactivation; Actinic light; Cu-sputtering; Cu-cotton films; XPS
资金
- COST Action Highly Ionized Impulse Plasma Processes (HiPIMS) [MP0804]
- COST Action Biological Adhesives, from Biology to Biomimetics [TD0906]
- EPFL
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 6 log(10) (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 Ti- and 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. (C) 2012 Elsevier B.V. All rights reserved.
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