Indoor Light Enhanced Photocatalytic Ultra-Thin Films on Flexible Non-Heat Resistant Substrates Reducing Bacterial Infection RisksReport as inadecuate


Indoor Light Enhanced Photocatalytic Ultra-Thin Films on Flexible Non-Heat Resistant Substrates Reducing Bacterial Infection Risks


Indoor Light Enhanced Photocatalytic Ultra-Thin Films on Flexible Non-Heat Resistant Substrates Reducing Bacterial Infection Risks - Download this document for free, or read online. Document in PDF available to download.

Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland





Abstract Photocatalytic antibacterial sol-gel coated substrates have been reported to kill bacteria under light or in the dark. These coatings showed non-uniform distribution, poor adhesion to the substrate and short effective lifetime as antibacterial surfaces. These serious limitations to the performance-stability retard the potential application of antibacterial films on a wide range of surfaces in hospital facilities and public places. Here, the preparation, testing and performance of flexible ultra-thin films prepared by direct current magnetron sputtering DCMS at different energies are reviewed. This review reports the recent advancements in the preparation of highly adhesive photocatalytic coatings prepared by up to date sputtering technology: High Power Impulse Magnetron Sputtering HIPIMS. These latter films demonstrated an accelerated antibacterial capability compared to thicker films prepared by DCMS leading to materials saving. Nanoparticulates of Ti and Cu have been shown during the last decades to possess high oxidative redox potentials leading to bacterial inactivation kinetics in the minute range. In the case of TiO2CuOx films, the kinetics of abatement of Escherichia coli E. coli and methicillin resistant Staphylococcus aureus MRSA were enhanced under indoor visible light and were perceived to occur within few minutes. Oligodynamic effect was seen to be responsible for bacterial inactivation by the small amount of released material in the dark and-or under light as detected by inductively-coupled plasma mass spectrometry ICP-MS. The spectral absorbance detected by Diffuse Reflectance Spectroscopy DRS was also seen to slightly shift to the visible region based on the preparation method. View Full-Text

Keywords: catalytic thin films; sputtering; bacterial inactivation; surface characterization; metal oxides; interfacial charge transfer IFCT; nanoparticulates catalytic thin films; sputtering; bacterial inactivation; surface characterization; metal oxides; interfacial charge transfer IFCT; nanoparticulates





Author: Sami Rtimi

Source: http://mdpi.com/



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