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Parnia Navabpour
Teer Coatings Ltd, Miba Coating Group, West Stone House, Berry Hill Industrial Estate, Droitwich WR9 9AS, UK

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Communication
Published: 17 January 2017 in Coatings
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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 TiO2. 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.

ACS Style

Parnia Navabpour; Kevin Cooke; Hailin Sun. Photocatalytic Properties of Doped TiO2 Coatings Deposited Using Reactive Magnetron Sputtering. Coatings 2017, 7, 10 .

AMA Style

Parnia Navabpour, Kevin Cooke, Hailin Sun. Photocatalytic Properties of Doped TiO2 Coatings Deposited Using Reactive Magnetron Sputtering. Coatings. 2017; 7 (1):10.

Chicago/Turabian Style

Parnia Navabpour; Kevin Cooke; Hailin Sun. 2017. "Photocatalytic Properties of Doped TiO2 Coatings Deposited Using Reactive Magnetron Sputtering." Coatings 7, no. 1: 10.

Journal article
Published: 16 October 2014 in Thin Solid Films
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This article reports on the morphology, structure, wettability, photocatalytic and mechanical properties of TiO2 and Ag-TiO2 thin films, with the latter also displaying antimicrobial activity. The coatings were deposited using reactive closed field unbalanced magnetron sputtering. It was possible, by varying the process parameters, to tailor the structure and composition of the coatings. TiO2 coatings which were deposited from a single titanium target (thickness ~ 1 μm) were relatively dense with low crystallinity and a mixed anatase and rutile structure. The addition of silver resulted in the formation of submicron sized silver particles dispersed throughout the coating. TiO2 coatings deposited from two titanium targets (thickness ~ 2 μm) had a mixed anatase and rutile structure with a less dense topography. Ag-TiO2 coatings deposited using this process showed a uniform dispersion of silver throughout the coating. All coatings presented excellent adhesion to the substrate and high photocatalytic activity under fluorescent light. Annealing at 600 °C had a detrimental effect on the photocatalytic activity as well as the mechanical properties of the coatings. The coatings deposited from a single Ti target were evaluated for their antimicrobial potential against E. coli. No reduction in the number of bacteria was observed using TiO2. Ag-TiO2 coatings, however, showed antimicrobial properties in the dark as well as light conditions, as a result of the innate antimicrobial potential of silver.

ACS Style

P. Navabpour; S. Ostovarpour; J. Hampshire; P. Kelly; J. Verran; K. Cooke. The effect of process parameters on the structure, photocatalytic and self-cleaning properties of TiO 2 and Ag-TiO 2 coatings deposited using reactive magnetron sputtering. Thin Solid Films 2014, 571, 75 -83.

AMA Style

P. Navabpour, S. Ostovarpour, J. Hampshire, P. Kelly, J. Verran, K. Cooke. The effect of process parameters on the structure, photocatalytic and self-cleaning properties of TiO 2 and Ag-TiO 2 coatings deposited using reactive magnetron sputtering. Thin Solid Films. 2014; 571 ():75-83.

Chicago/Turabian Style

P. Navabpour; S. Ostovarpour; J. Hampshire; P. Kelly; J. Verran; K. Cooke. 2014. "The effect of process parameters on the structure, photocatalytic and self-cleaning properties of TiO 2 and Ag-TiO 2 coatings deposited using reactive magnetron sputtering." Thin Solid Films 571, no. : 75-83.

Journal article
Published: 15 July 2014 in Coatings
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TiO2 coatings deposited using reactive magnetron sputtering and spray coating methods, as well as Ag- and Mo-doped TiO2 coatings were investigated as self-cleaning surfaces for beverage processing. The mechanical resistance and retention of the photocatalytic properties of the coatings were investigated over a three-month period in three separate breweries. TiO2 coatings deposited using reactive magnetron sputtering showed better mechanical durability than the spray coated surfaces, whilst the spray-deposited coating showed enhanced retention of photocatalytic properties. The presence of Ag and Mo dopants improved the photocatalytic properties of TiO2 as well as the retention of these properties. The spray-coated TiO2 was the only coating which showed light-induced hydrophilicity, which was retained in the coatings surviving the process conditions.

ACS Style

Parnia Navabpour; Soheyla Ostovarpour; Carin Tattershall; Kevin Cooke; Peter Kelly; Joanna Verran; Kathryn Whitehead; Claire Hill; Mari Raulio; Outi Priha. Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings. Coatings 2014, 4, 433 -449.

AMA Style

Parnia Navabpour, Soheyla Ostovarpour, Carin Tattershall, Kevin Cooke, Peter Kelly, Joanna Verran, Kathryn Whitehead, Claire Hill, Mari Raulio, Outi Priha. Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings. Coatings. 2014; 4 (3):433-449.

Chicago/Turabian Style

Parnia Navabpour; Soheyla Ostovarpour; Carin Tattershall; Kevin Cooke; Peter Kelly; Joanna Verran; Kathryn Whitehead; Claire Hill; Mari Raulio; Outi Priha. 2014. "Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings." Coatings 4, no. 3: 433-449.