Innovative photocatalyst (FeO<sub>x</sub>–TiO<sub>2</sub>): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light

Rtimi, Sami; Sanjinés, R.; Kiwi, J.; Pulgarín, C.; Bensimon, M.; Khmel, I. A.; Надточенко, В. А.

doi:10.1039/c5ra18960h

Cited by 22 publications

(29 citation statements)

References 40 publications

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“…Binary oxides and Cu-decorated binary oxides of TiO 2 -ZrO 2 have been investigated as TiO 2 -based composites [27]. Doping TiO 2 with cations [28] and more recently with FeOx increase the absorption of light in the visible region enhancing the bacterial inactivation under sunlight irradiation [29].…”

Section: Introductionmentioning

confidence: 99%

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

Rtimi

Giannakis

Bensimon

et al. 2016

Applied Catalysis B: Environmental

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a b s t r a c tInsight is provided in this study for the effect of the TiO 2 film densification/compactness on polyethylene (PE-TiO 2 ) by sputtering TiO 2 at two very different energy levels. Uniform, adhesive low energy films were prepared by direct current magnetron sputtering (DCMS) and compared with films sputtered at high energy levels by high power impulse magnetron sputtering (HIPIMS). Nano-particulate TiO 2 films sputtered by HPIMS presented sizes of ∼10.2 nm compared to films sputtered by DCMS with TiO 2 sizes of ∼16.5 nm as determined by X-ray diffraction (XRD). The E. coli inactivation kinetics was three times faster for the samples sputtered by HIPIMS compared to their DCMS counterparts. This is an unexpected finding since the DCMS presenting larger TiO 2 sized nanoparticles released a higher amount of Ti-ions compared to the HIPIMS samples as monitored by inductively coupled plasma mass-spectrometry (ICP-MS). The Ti-ions released do not seem to react through an oligodynamic effect but diffuse through the less compact TiO 2 sputtered by DCMS. The faster bacterial inactivation kinetics observed by the HIPIMS sputtered samples can be understood in terms of the complete of Ti 4+ /Ti 3+ redox conversion during bacterial inactivation detected by X-ray photo-electron spectroscopy (XPS) compared to the smaller Ti 4+ /Ti 3+ effect observed in the DCMS-samples. A higher optical density was detected for the HIPIMS sputtered samples by diffuse reflectance spectroscopy (DRS). Evidence is presented for the shift in surface potential and local pH during bacterial inactivation under aerobic and anaerobic conditions. A reaction mechanism is suggested based on the findings described in this study. The sputtered films present the potential to hinder biofilm formation on flexible thin polymers/textiles widely used in hospitals and health facilities.

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Section: Introductionmentioning

confidence: 99%

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

Rtimi

Giannakis

Bensimon

et al. 2016

Applied Catalysis B: Environmental

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“…The FeOOH photo-generated charges being very short lived due to its small band gap would increase their lifetime due to cbe-transfer to the anatase (trapping states) or the concomitant vbh+ injection into Ag 2 O [48].…”

Section: Mechanism Suggested For the Bacterial Inactivation Onmentioning

confidence: 99%

“…To increase the visible absorption of nanotubes, Fe-doping was carried out and their preparation and properties have been reported as well as their use in processes mediating dye degradation [18,19]. Fe-TiO 2 photocatalysts have also been reported recently to be effective in bacterial inactivation under solar irradiation [20,21].…”

Section: Introductionmentioning

confidence: 99%

FeOx magnetization enhancing E. coli inactivation by orders of magnitude on Ag-TiO2 nanotubes under sunlight

Mangayayam

Kiwi

Giannakis

et al. 2017

Applied Catalysis B: Environmental

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a b s t r a c tDrastic bacterial enhancement was observed when the Ag(3%)-TiO 2 nanotubes were modified with FeOx (3%) magnetic oxide. On bare TiO 2 -nanotubes a reduction of 0.2log 10 CFU was observed within one hour under simulated low intensity solar light. Under similar conditions, a bacterial reduction of 2.5log 10 CFU was observed on Ag(3%)TiO 2 increasing to 6.0log 10 CFU on Ag(3%)-TiO 2 -FeOx(3%) magnetic nanotubes. The bacterial inactivation kinetics is strongly influenced by the addition of FeOx. The fast inactivation induced by the composite catalyst seems to involve an increase in the interfacial charge transfer (IFCT) compared to a 2-oxide composite photocatalyst. Stable recycling of the photocatalyst was observed leading to bacterial oxidation. The unambiguous identification of the radical intermediates: OH-radicals, O-singlet and the valence holes vb(h + ) on the Ag-TiO 2 -FeOx interface showed that the valence band holes vb(h + ) were the main oxidative intermediates leading to bacterial inactivation. Nanotubes size, crystallinity and bulk composition of magnetite 1% ( = 51.0• ), anatase 5% ( = 8.9• ), goethite 37.3% ( = 9.0 • ), silver 1% ( = 2.7• ) was obtained by the Rietveld refinement for the Ag(3%)-TiO 2 -FeOx(3%) nanotubes. The redox chemistry during bacterial inactivation was determined by X-ray photoelectron spectroscopy (XPS).

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“…However, more work using fast kinetics by femto-and picosecond spectroscopy in the visible region is still necessary to identify the nature and lifetime of these ROS species intervening in the individual pathogen inactivation. Recent works involving the fast kinetics of surfaces producing ROS under visible light that lead to subsequent E. coli inactivation have been reported recently by Kiwi et al [47] and Rtimi et al [48]. Photocatalytic degradation of pollutants and bacteria mediated by TiO 2 is a promising approach to face the increasing environmental contamination.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Accelerated Antibacterial Inactivation on 2D Cu-Titania Surfaces under Indoor Visible Light

2017

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This review focuses on Cu/TiO 2 sequentially sputtered and Cu-TiO 2 co-sputtered catalytic/photocatalytic surfaces that lead to bacterial inactivation, discussing their stability, synthesis, adhesion, and antibacterial kinetics. The intervention of TiO 2 , Cu, and the synergic effect of Cu and TiO 2 on films prepared by a colloidal sol-gel method leading to bacterial inactivation is reviewed. Processes in aerobic and anaerobic media leading to bacterial loss of viability in multidrug resistant (MDR) pathogens, Gram-negative, and Gram-positive bacteria are described. Insight is provided for the interfacial charge transfer mechanism under solar irradiation occurring between TiO 2 and Cu. Surface properties of 2D TiO 2 /Cu and TiO 2 -Cu films are correlated with the bacterial inactivation kinetics in dark and under light conditions. The intervention of these antibacterial sputtered surfaces in health-care facilities, leading to Methicillin-resistant Staphylococcus Aureus (MRSA)-isolates inactivation, is described in dark and under actinic light conditions. The synergic intervention of the Cu and TiO 2 films leading to bacterial inactivation prepared by direct current magnetron sputtering (DCMS), pulsed direct current magnetron sputtering (DCMSP), and high power impulse magnetron sputtering (HIPIMS) is reported in a detailed manner.

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Innovative photocatalyst (FeO_x–TiO₂): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light

Abstract: This study reports the photosensitizing effect/mechanism of FeOx under visible light irradiation and charge transfer to TiO2 on FeOx–TiO2 cosputtered film.

Cited by 22 publications

References 40 publications

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

FeOx magnetization enhancing E. coli inactivation by orders of magnitude on Ag-TiO2 nanotubes under sunlight

Recent Developments in Accelerated Antibacterial Inactivation on 2D Cu-Titania Surfaces under Indoor Visible Light

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Innovative photocatalyst (FeOx–TiO2): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light

Abstract: This study reports the photosensitizing effect/mechanism of FeOx under visible light irradiation and charge transfer to TiO2 on FeOx–TiO2 cosputtered film.

Cited by 22 publications

References 40 publications

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

FeOx magnetization enhancing E. coli inactivation by orders of magnitude on Ag-TiO2 nanotubes under sunlight

Recent Developments in Accelerated Antibacterial Inactivation on 2D Cu-Titania Surfaces under Indoor Visible Light

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Innovative photocatalyst (FeO_x–TiO₂): transients induced by femtosecond laser pulse leading to bacterial inactivation under visible light