<abstract xmlns="http://www.w3.org/1999/xhtml">In this work, the effect of titanium dioxide (TiO2) thin film microstructure on photocatalytic and biological activity was described. The films were prepared by low-pressure and high-energy magnetron sputtering processes. The structural investigations performed by X-ray diffraction revealed that the films from both the processes were nanocrystalline. It was found that TiO2 prepared by low-pressure process had the anatase structure with crystallites in size of 20 nm, while the film deposited in high-energy process had the rutile form with crystallites in size of 5 nm. The analysis of surface topography with the aid of optical profiler showed that all prepared films were homogenous and their roughness was lower than 1 nm. The wettability studies revealed hydrophilic nature of both films. The values of water contact angle obtained for anatase and rutile films were equal to 40° and 49°, respectively. Both types of the thin films were photocatalitycally active, but rutile exhibited higher decomposition rate as compared to anatase. During the photocatalytic reaction in the presence of TiO2-rutile film after 12 hours of UV-Vis irradiation 30 % of phenol was decomposed, whereas in case of TiO2-anatase it was only 10 %. Moreover, the influence of as-deposited coatings on the growth of selected microbes (<italic>Staphylococcus aureus, Escherichia coli, Candida albicans</italic>) was examined. It was found that the structural properties of TiO2 had an effect on biological activity of these films.</abstract>

In this work, the effect of titanium dioxide (TiO2) thin film microstructure on photocatalytic and biological activity was described. The films were prepared by low-pressure and high-energy magnetron sputtering processes. The structural investigations performed by X-ray diffraction revealed that the films from both the processes were nanocrystalline. It was found that TiO2 prepared by low-pressure process had the anatase structure with crystallites in size of 20 nm, while the film deposited in high-energy process had the rutile form with crystallites in size of 5 nm. The analysis of surface topography with the aid of optical profiler showed that all prepared films were homogenous and their roughness was lower than 1 nm. The wettability studies revealed hydrophilic nature of both films. The values of water contact angle obtained for anatase and rutile films were equal to 40° and 49°, respectively. Both types of the thin films were photocatalitycally active, but rutile exhibited higher decomposition rate as compared to anatase. During the photocatalytic reaction in the presence of TiO2-rutile film after 12 hours of UV-Vis irradiation 30 % of phenol was decomposed, whereas in case of TiO2-anatase it was only 10 %. Moreover, the influence of as-deposited coatings on the growth of selected microbes (Staphylococcus aureus, Escherichia coli, Candida albicans) was examined. It was found that the structural properties of TiO2 had an effect on biological activity of these films.

Effect of the structure on biological and photocatalytic activity of transparent titania thin-film coatings

Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Janiszewskiego 11/17, 50-372 Wroclaw,

Faculty of Mechanical Engineering, University of Technology and Life Sciences in Bydgoszcz, Kaliskiego 7, 85-796 Bydgoszcz,

Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Rudolfa Weigla 12, 53-114 Wroclaw,

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

In this work, the effect of titanium dioxide (TiO2) thin film microstructure on photocatalytic and biological activity was described. The films were prepared...

Thin film	Process	Phase	Crystal plane	D [nm]	d [nm]	d_PDF [nm]	Δd (%)	PDF card
TiO₂	low-pressure	anatase	(1 0 1)	19.9	0.3519	0.3520 [24]	−0.03	21-1272 [24]
TiO₂	high-energy	rutile	(1 1 0)	4.6	0.3240	0.3247 [25]	−0.21	21-1276 [25]

Effect of the structure on biological and photocatalytic activity of transparent titania thin-film coatings

Data publikacji: 17 gru 2016

Zakres stron: 856 - 862

Otrzymano: 20 kwi 2016

Przyjęty: 29 sie 2016

DOI: https://doi.org/10.1515/msp-2016-0100

Słowa kluczowe
TiO, thin film, nanocrystalline structure, antibacterial properties, photocatalytic activity

© 2016 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Structural properties of TiO2 thin films determined based on the results of XRD.

Effect of the structure on biological and photocatalytic activity of transparent titania thin-film coatings

Data publikacji: 17 gru 2016

Zakres stron: 856 - 862

Otrzymano: 20 kwi 2016

Przyjęty: 29 sie 2016

DOI: https://doi.org/10.1515/msp-2016-0100

Słowa kluczoweTiO, thin film, nanocrystalline structure, antibacterial properties, photocatalytic activity

© 2016 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Structural properties of TiO2 thin films determined based on the results of XRD.

Słowa kluczowe
TiO, thin film, nanocrystalline structure, antibacterial properties, photocatalytic activity