Anatase or rutile TiO2 nanolayer formation on Ti substrates by laser radiation: Mechanical, photocatalytic and antibacterial properties

Medvids, Artūrs; Onufrijevs, Pāvels; Kaupužs, Jevgenis; Eglı̅tis, Raivis; Padgurskas, Juozas; Žunda, Audrius; Mimura, Hidenori; Skadiņš, Ingus; Varnagiris, Šarūnas

doi:10.1016/j.optlastec.2020.106898

Cited by 28 publications

(21 citation statements)

References 47 publications

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“…The Raman spectrum showed that the titanium oxides found on the surface are in anatase and rutile forms. Following [ 41 ], a layer of titanium dioxide (TiO 2 ) improves corrosion resistance, biocompatibility, and photocatalytic activity. In a comparison of titanium dioxide forms, an anatase improves implant properties, e.g., cytocompatibility and antibacterial properties.…”

Section: Discussionmentioning

confidence: 99%

“…In a comparison of titanium dioxide forms, an anatase improves implant properties, e.g., cytocompatibility and antibacterial properties. On the other hand, rutile phase of TiO 2 finds application in optoelectronic devices [ 41 , 42 ]. An ultrasonic cleaning process was used to test the effect of the cleaning on the wettability of the post-processed samples.…”

Section: Discussionmentioning

confidence: 99%

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An Experimental Investigation of Controlled Changes in Wettability of Laser-Treated Surfaces after Various Post Treatment Methods

et al. 2021

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In this paper, a quick nanosecond laser micro structuring process was employed to change the surface wettability of Ti6Al4V alloy. The same laser structuring method was used throughout, but with varying input fluence. The laser processing parameters resulted in high surface melting. After laser treatment, four post-processing methods were used, namely high vacuum, low temperature annealing, storage in a polyethylene bag, and storage in ambient air. Subsequently, the water droplet contact angle was measured over a long time period of 55 days. The results show that the sample stored in ambient air remained hydrophilic. On the other hand, the sample post-processed in a vacuum chamber behaved hydrophobically with a contact angle of approximately 150°. Other post-processing did not lead to specific wettability behavior. After wettability testing, all samples were cleaned ultrasonically in distilled water. This cleaning process led to annulation of all obtained properties through post-processing. In summary, this paper shows that it is more important to study surface chemistry than topography in terms of effects on wettability. Moreover, surface wettability can be controlled by laser structuring, post-processing, and surface cleaning.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

An Experimental Investigation of Controlled Changes in Wettability of Laser-Treated Surfaces after Various Post Treatment Methods

et al. 2021

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“…The photocatalytic efficiency of rutile is low due to the existence of numerous unordered grain boundaries, which act as the recombination centers of e-h pairs. The anatase phase of a TiO 2 crystal has better photocatalytic properties owing to the higher electron lifetime, which is 100 times higher than that in the rutile phase [4]. The bandgap of TiO 2 is wide (3.2 eV for anatase, 3.0 eV for rutile), which results in poor utilization ability of visible light [5,6].…”

Section: Introductionmentioning

confidence: 99%

A High-Efficiency TiO2/ZnO Nano-Film with Surface Oxygen Vacancies for Dye Degradation

Hao

Wei

et al. 2021

Materials

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Photocatalytic degradation of organic pollutants in water is a highly efficient and green approach. However, the low quantum efficiency is an intractable obstacle to lower the photocatalytic efficiency of photocatalysts. Herein, the TiO2/ZnO heterojunction thin films combined with surface oxygen vacancies (OVs) were prepared through magnetron sputtering, which was designed to drive rapid bulk and surface separation of charge carriers. The morphology and structural and compositional properties of films were investigated via different techniques such as SEM, XRD, XPS, Raman, AFM, and XPS. It has been found that by controlling the O2/Ar ratio, the surface morphology, thickness, chemical composition, and crystal structure can be regulated, ultimately enhancing the photocatalytic performance of the TiO2/ZnO heterostructures. In addition, the heterojunction thin film showed improved photocatalytic properties compared with the other nano-films when the outer TiO2 layer was prepared at an O2/Ar ratio of 10:35. It degraded 88.0% of Rhodamine B (RhB) in 90 min and 90.8% of RhB in 120 min. This was attributed to the heterojunction interface and surface OVs, which accelerated the separation of electron–hole (e–h) pairs.

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“…Titanium dioxide (TiO2) nanoparticles have been widely used for energy production, wastewater treatment, cosmetics, optics, self-cleaning and bio-medical applications 1 . Among its significant crystalline features, the anatase phase of TiO2 is preferred for use in antimicrobial coatings and hydrogen production due to its higher activity compared to rutile 2,3 . The rutile phase of TiO2 is preferred for optoelectronic applications 2,4 .…”

mentioning

confidence: 99%

“…Among its significant crystalline features, the anatase phase of TiO2 is preferred for use in antimicrobial coatings and hydrogen production due to its higher activity compared to rutile 2,3 . The rutile phase of TiO2 is preferred for optoelectronic applications 2,4 . Anatase has a simple tetragonal Bravais lattice, whereas that of the rutile has a body centred lattice 5 .…”

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confidence: 99%

Unravelling the impact of Ta doping on the electronic and structural properties of titania: A combined theoretical and experimental approach

Kumaravel

Maccioni

Mathew

et al. 2021

Preprint

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The introduction of new energy levels in the forbidden band through the doping of metal ions is an effective strategy to improve the thermal stability of TiO2. In the present study, the impact of Ta doping on the anatase to rutile transition (ART), structural characteristics, anion and cation vacancy formation were investigated in detail using Density Functional Theory (DFT) and experimental characterisation including, X-ray diffraction (XRD), Raman, and X-ray photoelectron spectroscopy (XPS). The average crystallite size of TiO2 decreases with an increase in the Ta concentration. At high temperatures, more oxygen atoms entered the crystal lattice and occupy the vacancies, leading to lattice expansion. Importantly, we find that Ta doping preserved the anatase content of TiO2 up to annealing temperatures of 850 °C which allows anatase stability to be maintained at typical ceramic processing temperatures. The substitution of Ti4+ by the Ta5+ ions increased the electron concentration in the crystal lattice through formation of Ti3+ defect states. Raman studies revealed the formation of new Ta bonds via disturbing the Ti-O-Ti bonds in the crystal lattice. It is concluded that under the oxidising conditions, Ta5+ ions could be enhanced on Ta-TiO2 surface due to the slow diffusion kinetics.

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Anatase or rutile TiO2 nanolayer formation on Ti substrates by laser radiation: Mechanical, photocatalytic and antibacterial properties

Cited by 28 publications

References 47 publications

An Experimental Investigation of Controlled Changes in Wettability of Laser-Treated Surfaces after Various Post Treatment Methods

An Experimental Investigation of Controlled Changes in Wettability of Laser-Treated Surfaces after Various Post Treatment Methods

A High-Efficiency TiO2/ZnO Nano-Film with Surface Oxygen Vacancies for Dye Degradation

Unravelling the impact of Ta doping on the electronic and structural properties of titania: A combined theoretical and experimental approach

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