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TiON and TiON-Ag sputtered surfaces leading to bacterial inactivation under indoor actinic light

Paper ID Volume ID Publish Year Pages File Format Full-Text
27175 44006 2013 12 PDF Available
Title
TiON and TiON-Ag sputtered surfaces leading to bacterial inactivation under indoor actinic light
Abstract

This study reports the details Escherichia coli inactivation kinetics on TiON and TiON-Ag films sputtered on polyester by direct current reactive magnetron sputtering (DC) and pulsed magnetron sputtering (DCP) in an Ar/N2/O2 atmosphere. The use of TiON leads to bacterial inactivation avoiding leaching of Ag. The surface of TiON and TiON-Ag was characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), electron microscopy (EM), X-ray fluorescence (XRF) and contact angle (CA) measurements. Evidence for the photocatalyst self-cleaning after the bacterial inactivation was shown by XPS, contact angle (CA) and the Zetasizer zeta-potential of the proteins. The photo-induced charge transfer from Ag2O and TiO2 is discussed considering the relative positions of the electronic bands of the two oxides. An interfacial charge transfer mechanism (IFCT) for the photo-induced electron injection is suggested. The most suitable TiON coating sputtered on polyester was 70 nm thick and inactivated E. coli within 120 min under low intensity visible/actinic light (400–700 nm, 4 mW/cm2). TiON-Ag sputtered catalysts shortened E. coli inactivation to ∼55 min, since Ag accelerated bacterial inactivation due to its disinfecting properties. Evidence is presented for the repetitive performance within short times of the TiON and TiON-Ag polyester under low intensity visible light.

Graphical abstractSuggested reaction mechanism fir the visible light photo-induced electron injection by Ag2O into TiO2.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► This study present in detail TiON and TiON-Ag films effective in Escherichia coli inactivation under actinic light. ► The magnitude of the optical absorption of TiON films was seen to be in direct relation to the E. coli inactivation kinetics. ► A mechanism is suggested for E. coli inactivation related to interfacial charge transfer between two oxides.

Keywords
DC-sputtering; TiON films; TiON-Ag films; Interfacial charge transfer; E. coli
First Page Preview
TiON and TiON-Ag sputtered surfaces leading to bacterial inactivation under indoor actinic light
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 256, 15 March 2013, Pages 52–63
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering