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

Baghriche, O.; Rtimi, Sami; Pulgarín, C.; Sanjinés, R.; Kiwi, J.

doi:10.1016/j.jphotochem.2012.10.011

Cited by 49 publications

(41 citation statements)

References 30 publications

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“…Cu-sputtered for 40 s by DCMSP inactivated E. coli under the same light within 1 hour. When sputtering TiO 2 for 10 min followed by sputtering of Cu-layers for 40 s, the composite film inactivated E. coli within less than 5 min under the same light [56] showing the beneficial synergic action of TiO 2 and Cu accelerating the E. coli inactivation kinetics. In the dark the E. coli inactivation for the sample CuO x /TiO 2 was reported to occur within 30 min.…”

Section: Cu Coupled With Tio 2 Sputtered Surfaces Active In the Visibmentioning

confidence: 98%

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

Rtimi

2017

Catalysts

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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 TiO 2 -CuO x 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.

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Section: Cu Coupled With Tio 2 Sputtered Surfaces Active In the Visibmentioning

confidence: 98%

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

Rtimi

2017

Catalysts

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“…After the eighth cycle, Figure 4 shows Cu was released at ppb levels <8 ppb. These Cu-levels are not considered cytotoxic to mammalian cells [150,166]. Figure 5 shows a concomitant lower release of 8 ppb Ti-ions during bacterial disinfection, which dropped to about 4 ppb after the eighth cycle.…”

Section: Current Work On Tio2/cu Sputtered Surfaces By Dcms Dcmsp Amentioning

confidence: 94%

“…After the eighth cycle, Figure 4 shows Cu was released at ppb levels <8 ppb. These Cu-levels are not considered cytotoxic to mammalian cells [150,166]. TiO2/Cu cotton samples increased the E. coli inactivation kinetics with the increase of the applied light intensity [166].…”

Section: Current Work On Tio2/cu Sputtered Surfaces By Dcms Dcmsp Amentioning

confidence: 95%

“…These Cu-levels are not considered cytotoxic to mammalian cells [150,166]. TiO2/Cu cotton samples increased the E. coli inactivation kinetics with the increase of the applied light intensity [166]. Therefore, the predominant effect leading to bacterial inactivation seems to be due to the photo-generated charges either by: (a) the TiO2; (b) the intermetallic TiO2/Cu and TiO2-Cu phases; and finally (c) the CuO.…”

Section: Current Work On Tio2/cu Sputtered Surfaces By Dcms Dcmsp Amentioning

confidence: 97%

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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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“…The amount of Cu + -ions increases with HIPIMS at 6 Amps to reach 97% along 3% Ar 2+ . Finally, at 60 Amps the composition of the gas phase is: 17% Ar + , 3% Ar 2+ , 75% Cu + and 5% Cu 2+ [41,42]. Because of the different power applied by HIPIMS the ion trajectory in the plasma and subsequent condensation on the substrate surface proceed with a different diffusion and condensation in the case of HIPIMS compared to DCMS.…”

Section: E Coli Inactivation Kinetics and Mechanism On Cu-polyester mentioning

confidence: 99%

Comparison of HIPIMS sputtered Ag- and Cu-surfaces leading to accelerated bacterial inactivation in the dark

Rtimi

Baghriche

Pulgarín

et al. 2014

Surface and Coatings Technology

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Recently, compact uniform and adhesive films of Ag and Cu have been prepared by DC-magnetron sputtering (DC), pulsed DC magnetron sputtering (DCP) and high power impulse magnetron sputtering (HIPIMS). This study reports the HIPIMS deposition for Ag and Cu on textile fabrics, the bacterial inactivation kinetics and the nature of the species in the plasma produced during HIPIMS sputtering. The deposition rates of Ag and Cu atoms and the bacterial inactivation times are reported in the dark and under light as a function of the applied peak currents during the sputtering by HIPIMS. By X-ray photoelectron spectroscopy (XPS), the surface percentage atomic concentration and the oxidation state changes are reported during bacterial inactivation. The Ar and metal-ions produced in the magnetron chamber were determined by mass spectroscopy (QMS). A mechanism for the bacterial inactivation is suggested for Ag and Cu HIPIMS sputtered surfaces.

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

Cited by 49 publications

References 30 publications

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

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

Comparison of HIPIMS sputtered Ag- and Cu-surfaces leading to accelerated bacterial inactivation in the dark

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