Photo-induced self-cleaning and biocidal behaviour of titania and copper oxide multilayers

Yates, Heather M.; Brook, L.A.; Ditta, Iram B.; Evans, Philip G.; Foster, H. A.; Sheel, David W.; Steele, Abbey

doi:10.1016/j.jphotochem.2007.12.023

Cited by 78 publications

(62 citation statements)

References 31 publications

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“…Also nosocomial infections due to antibiotic resistant bacteria are becoming more frequent developing into a serious problem associated with high health care costs. Recently, Mills et al [6], Parkin et al [7][8][9][10], Foster et al [11], Dunlop et al [12] and Yates et al [13] have reported antibacterial Ag, Cu, and TiO 2 coatings on glass and polymer films depositing the metal/oxides by CVD and sputtering techniques. Our laboratory has reported the antibacterial properties and kinetics of Ag-and Cu-modified textiles deposited by DC-magnetron, pulsed DC-magnetron and high power impulse magnetron sputtering (HIPIMS).…”

Section: Introductionmentioning

confidence: 99%

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Rtimi

Pascu

Sanjinés

et al. 2013

Applied Catalysis B: Environmental

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a b s t r a c tThis study reports visible light sensitive ZrNO and ZrNO-Ag polyester samples prepared by sputtering in an Ar/N 2 /O 2 atmosphere leading to Escherichia coli bacterial inactivation. The bacterial inactivation by ZrNO avoids the increasing environmental concern involving the fate of Ag-leaching of many disinfectants. The simultaneous co-sputtering of ZrNO and Ag 2 O enhanced the E. coli bacterial inactivation kinetics compared to the sequential sputtering of ZrNO and Ag. A reaction mechanism is suggested triggered by photoinduced interfacial charge transfer (IFCT) suggesting electron injection form the Ag 2 O cb to the ZrO 2cb . The sizes of the ZrO 2 and Ag nanoparticles in the co-sputtered ZrNO-Ag were 80-130 nm and 8-15 nm respectively as determined by high angular annular dark field (HAADF) microscopy. Evidence is presented by X-ray photoelectron spectroscopy (XPS) for the self-cleaning of the photocatalysts after bacterial inactivation. This enabled a stable catalyst reuse. The XPS experimental spectra of ZrNO and ZrNO-Ag were deconvoluted into their ZrN, ZrNO and ZrO 2 components. The amounts of Ag-ions released during bacterial inactivation were < 5 ppb/cm 2 and well below the Ag cytotoxic levels. Since no cytotoxicity was introduced during the bacterial inactivation process, the ZrNO-Ag disinfection proceeds through an oligodynamic effect.

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Section: Introductionmentioning

confidence: 99%

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Rtimi

Pascu

Sanjinés

et al. 2013

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

show abstract

“…More effective antibacterial films are needed at present due to the increasing resistance of pathogenic bacteria to synthetic antibiotics when administered for long times [2]. Recently, Mills et al [3], Parkin et al [4][5][6][7], Foster et al [8], Dunlop et al [9] and Yates et al [10] have reported antibacterial films of Ag and Cu films on glass and thin polymer films by chemical vapor deposition (CVD) and in some cases sputtering techniques.…”

Section: Introductionmentioning

confidence: 99%

Coupling of narrow and wide band-gap semiconductors on uniform films active in bacterial disinfection under low intensity visible light: Implications of the interfacial charge transfer (IFCT)

Rtimi

Sanjinés

Pulgarín

et al. 2013

Journal of Hazardous Materials

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“…More recently, Qiu et al reported Cu/TiO 2 powdwes inducing self-cleaning of dyes besides E. coli bacterial inactivation [14]. To obtain a better film adhesion/reproducibility on the underlying support and preparation reproducibility of these antibacterial films compared to colloidal deposited films, sputtering of Cu, TiO 2 or both on glass have been reported [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Insight into the catalyst/photocatalyst microstructure presenting the same composition but leading to a variance in bacterial reduction under indoor visible light

Rtimi

Pulgarín

Robyr

et al. 2017

Applied Catalysis B: Environmental

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a b s t r a c tInsight into two different uniform atomic-scale microstructures of Cu-and Ti-oxides sputtered on polyethylene (PET) presenting different redox properties and a distinct bacterial inactivation dynamics. Co-sputtered (CuOx-TiO 2 -PET) consists mainly of CuO. It leads to bacterial inactivation kinetics within 20 min under very low intensity actinic light (0.5 mW/cm 2 ). The sequential sputtered (CuOx/TiO 2 -PET) consist mainly of Cu 2 O and led to bacterial inactivation within 90 min. Evidence for redox catalysis is present leading to bacterial inactivation by X-ray photoelectron spectroscopy (XPS). The Cu and Ti uniform distribution on the catalyst surface was mapped along the coating thickness by wavelength dispersive spectrometry (WDS). The inactivation time of E. coli determined by fluorescence stereomicroscopy was in agreement with the time found by agar plating. The short-lived transient intermediates on the cosputtered catalyst were followed by laser spectroscopy in the femto/picosecond region (fs-ps). By atomic force microscopy (AFM) the roughness of the co-sputtered (CuO) and sequentially sputtered samples (Cu 2 O) were found respectively as 1.63 nm and 22.92 nm. The magnitude of the roughness was correlated with the bacterial inactivation times for both types of catalysts. The differentiated mechanisms for the vectorial charge transfer on co-sputtered and sequential sputtered CuOx/TiO 2 catalysts and it is suggested as one of the factors leading to a distinct bacterial inactivation kinetics.

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Photo-induced self-cleaning and biocidal behaviour of titania and copper oxide multilayers

Cited by 78 publications

References 31 publications

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Coupling of narrow and wide band-gap semiconductors on uniform films active in bacterial disinfection under low intensity visible light: Implications of the interfacial charge transfer (IFCT)

Insight into the catalyst/photocatalyst microstructure presenting the same composition but leading to a variance in bacterial reduction under indoor visible light

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