The effect of process parameters on the structure, photocatalytic and self-cleaning properties of TiO2 and Ag-TiO2 coatings deposited using reactive magnetron sputtering

Navabpour, Parnia; Ostovarpour, Soheyla; Hampshire, J.; Kelly, Peter; Verran, Joanna; Cooke, Kevin

doi:10.1016/j.tsf.2014.10.040

Cited by 29 publications

(18 citation statements)

References 38 publications

(44 reference statements)

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“…Cell membrane damage is due to the increase in the outer cell membrane permeability. This leads to membrane destabilization not allowing the cell membrane to keep the osmotic pressure of the internal cytoplasm leading ultimately to cell dead [10,14,[22][23][24][25][26][27]. Control experiments with E. coli cells incubated on PE alone kept alive up to 120 min exposure remaining green.…”

Section: Resultsmentioning

confidence: 99%

“…TiO 2 composites with added bactericide metal/oxides deposited by colloids calcined on heat resistant surfaces has been the subject of many recent studies [1,2]. The effect of TiO 2 -N,S nanoparticles and sputtered TiO 2 films to increase visible light absorption and accelerate bacterial inactivation kinetics have been recently reviewed by Dionysiou et al, [3,4], Foster et al, [5], Pillai et al, [6][7][8], Byrne et al, [9], Navabpour et al, [10], Verran et al, [11] and Bahnemann et al, [12,13]. Since the uniform and reproducible adhesion of TiO 2 films on substrates starting form colloidal depositions has been shown to present serious problems, antibacterial TiO 2 and TiO 2 -composites have been recently prepared by chemical vapor deposition (CVD), by RF-sputtering and evaluated in regards to their bactericide features [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

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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“…In Table 2 Ceramic matrix and silver crystalline structures and grain sizes reported in the literature. [48,49] 3-8 Amorphous AlAO -TiO 2 [11,14,118,119] 12. 3.…”

Section: Microstructure and Phase Compositionmentioning

confidence: 99%

Functional properties of ceramic-Ag nanocomposite coatings produced by magnetron sputtering

Calderón

Cavaleiro

Carvalho

2016

Progress in Materials Science

125

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In recent years, the use of nanocomposite materials to functionalize surfaces has been investigated, taking advantage of the complementary properties of the nanocomposite constituents. Among this family of materials, ceramic-Ag coatings have been widely studied due to the large variety of functionalities that silver possesses and the possibility of tuning the coating's practical features by selecting the proper matrix to support this noble metal. Therefore, this review focuses on the effects of silver nanoparticles on the functional properties of ceramic-Ag nanocomposites. The chemistry, structure, morphology and topography of the coatings are analyzed with respect to the changes produced by the silver nanoparticles' distribution, amount and sizes and by altering production process variables. To offer a clear understanding of the functionalities of these materials, the optical, electrical, mechanical, tribological, electrochemical and biological properties reported in the last decade are reviewed, focusing on the ability to tune such properties by modifying the silver distribution, morphology and composition. In particular, the surface plasmon resonance, self-lubricating ability and antibacterial effect of silver are covered in detail, establishing their correlation with factors such as silver diffusion, segregation and ionization.

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“…Our previous work [24,26] showed the potential of magnetron sputtering for the deposition of photoactive TiO 2 at high deposition rates and with excellent mechanical properties without a need for subsequent heat treatment. It also presented the potential of silver in improving the photocatalytic properties and imparting antimicrobial properties.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous studies [24,26], we presented the potential of closed-field, unbalanced magnetron sputtering (CFUBMS) for the production of photocatalytic TiO2 and Ag-doped TiO2 coatings at a high deposition rate. In this work, we attempted to improve the photocatalytic activity of the coatings through the use of other dopants and to gain a better understanding of the effect of the coating structure on its activity.…”

Section: Preparation Of Coated Surfacesmentioning

confidence: 99%

Photocatalytic Properties of Doped TiO2 Coatings Deposited Using Reactive Magnetron Sputtering

2017

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Mechanically robust photocatalytic titanium oxide coatings can be deposited using reactive magnetron sputtering. In this article, we investigate the effect of doping on the activity of reactively sputtered TiO 2 . Silver, copper and stainless steel targets were used to co-deposit the dopants. The films were characterised using XRD, SEM and EDX. Adhesion and mechanical properties were evaluated using scratch testing and nano-indentation, respectively, and confirmed that the coatings had excellent adhesion to the stainless steel substrate. All coatings showed superhydrophilicity under UV irradiation. A methylene blue degradation test was used to assess their photocatalytic activity and showed all coatings to be photoactive to varying degrees, dependent upon the dopant, its concentration and the resulting coating structure. The results demonstrated that copper doping at low concentrations resulted in the coatings with the highest photocatalytic activity under both UV and fluorescent light irradiation.

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The effect of process parameters on the structure, photocatalytic and self-cleaning properties of TiO2 and Ag-TiO2 coatings deposited using reactive magnetron sputtering

Cited by 29 publications

References 38 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.

Functional properties of ceramic-Ag nanocomposite coatings produced by magnetron sputtering

Photocatalytic Properties of Doped TiO2 Coatings Deposited Using Reactive Magnetron Sputtering

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