Laser-assisted modification of titanium dioxide nanotubes in a tilted mode as surface modification and patterning strategy

Wawrzyniak, Jakub; Karczewski, Jakub; Kupracz, Piotr; Grochowska, Katarzyna; Załęski, Karol; Pshyk, Oleksandr; Coy, Emerson; Bartmański, Michał; Szkodo, Marek; Siuzdak, Katarzyna

doi:10.1016/j.apsusc.2019.145143

Cited by 27 publications

(29 citation statements)

References 38 publications

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“…Although they achieved crystallization to anatase phase, in all irradiation regimes applied, the tops of TNT layers were molten and recrystallized with formation of a "ower-like" structure. In extensive studies, [46][47][48] a similar effect of fusion of a layer of $0.3 mm on the TNT tops was observed upon annealing with ns Nd:YAG laser at wavelengths of 266 nm and 355 nm. The regimes of minimizing material distortion have been explored.…”

Section: Introductionmentioning

confidence: 78%

“…[36][37][38][39][40][41][42] and references herein, laser annealing of TNT layers has been less explored. [43][44][45][46][47][48] Furthermore, two additional publications show an additional laser treatment aer thermal annealing as an effective method to increase the charge carrier density on the anatase TiO 2 surface. 49,50 The rst report on laser annealing of amorphous TNT layers was published in 2008 by Likodimos et al 43 who used the laser with the highest power from a Raman spectrometer for a phase transformation to anatase phase.…”

Section: Introductionmentioning

confidence: 99%

“…Morphological investigations of the TNT layers aer the laser treatment were not carried out in this study. Further approaches, carried out by different groups, [44][45][46][47][48] showed a deeper investigation of the laser treatment of amorphous TNT layers, with thicknesses up to 7 mm, irradiated by focussed laser beams of different wavelength and pulse duration. Hsu et al performed laser annealing of TNT layers with a nanosecond excimer laser.…”

Section: Introductionmentioning

confidence: 99%

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Laser-induced crystallization of anodic TiO₂nanotube layers

et al. 2020

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser-induced crystallization of anodic TiO₂nanotube layers

et al. 2020

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“…To our knowledge, such structures have not been yet reported in the literature. Although few works regarding laser-modification of TiO 2 NTs are available 22,23,31,32 , all of the investigators have focused on the densely packed nanotube arrays, where melting of neighboring nanotubes caused their individual features to disappear. Irradiation of differently spaced nanotubes 33 with λ = 355 nm and 30 mJ/cm 2 , however, is a reliable method of TiO 2 NT encapsulation ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Formation of the hollow nanopillar arrays through the laser-induced transformation of TiO2 nanotubes

Wawrzyniak

Karczewski

Kupracz

et al. 2020

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In the following article, we present a simple, two-step method of creating spaced, hollow nanopillars, from the titania nanotube arrays via pulsed laser-treatment. Due to the high ordering of the structure, the prepared material exhibits photonic properties, which has been shown to increase the overall photoefficiency. The optical and morphological changes in the titania nanotubes after pulsed laser-treatment with 532, 355, and 266 nm wavelengths in the 10–50 mJ/cm2 fluence range are studied. The investigation reveals, that by using appropriate wavelength and energy, the number of surface defects, geometrical features, or both can be tailored.

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“…The effect of laser annealing on the pristine TiO 2 -NTs was studied by several authors [16,17,37,39,47]. In all cases, it was concluded that the laser fluence required to create the continuous re-solidified layer has to be higher than 40 mJ/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

The Effect of Laser Re-Solidification on Microstructure and Photo-Electrochemical Properties of Fe-Decorated TiO2 Nanotubes

et al. 2020

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Fossil fuels became increasingly unpleasant energy source due to their negative impact on the environment; thus, attractiveness of renewable, and especially solar energy, is growing worldwide. Among others, the research is focused on smart combination of simple compounds towards formation of the photoactive materials. Following that, our work concerns the optimized manipulation of laser light coupled with the iron sputtering to transform titania that is mostly UV-active, as well as exhibiting poor oxygen evolution reaction to the material responding to solar light, and that can be further used in water splitting process. The preparation route of the material was based on anodization providing well organized system of nanotubes, while magnetron sputtering ensures formation of thin iron films. The last step covering pulsed laser treatment of 355 nm wavelength significantly changes the material morphology and structure, inducing partial melting and formation of oxygen vacancies in the elementary cell. Depending on the applied fluence, anatase, rutile, and hematite phases were recognized in the final product. The formation of a re-solidified layer on the surface of the nanotubes, in which thickness depends on the laser fluence, was shown by microstructure studies. Although a drastic decrement of light absorption was recorded especially in UV range, laser-annealed samples have shown activity under visible light even 20 times higher than bare titania. Electrochemical analysis has shown that the improvement of photoresponse originates mainly from over an order of magnitude higher charge carrier density as revealed by Mott-Schottky analysis. The results show that intense laser light can modulate the semiconductor properties significantly and can be considered as a promising tool towards activation of initially inactive material for the visible light harvesting.

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Laser-assisted modification of titanium dioxide nanotubes in a tilted mode as surface modification and patterning strategy

Cited by 27 publications

References 38 publications

Laser-induced crystallization of anodic TiO₂nanotube layers

Laser-induced crystallization of anodic TiO₂nanotube layers

Formation of the hollow nanopillar arrays through the laser-induced transformation of TiO2 nanotubes

The Effect of Laser Re-Solidification on Microstructure and Photo-Electrochemical Properties of Fe-Decorated TiO2 Nanotubes

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Laser-assisted modification of titanium dioxide nanotubes in a tilted mode as surface modification and patterning strategy

Cited by 27 publications

References 38 publications

Laser-induced crystallization of anodic TiO2nanotube layers

Laser-induced crystallization of anodic TiO2nanotube layers

Formation of the hollow nanopillar arrays through the laser-induced transformation of TiO2 nanotubes

The Effect of Laser Re-Solidification on Microstructure and Photo-Electrochemical Properties of Fe-Decorated TiO2 Nanotubes

Contact Info

Product

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Laser-induced crystallization of anodic TiO₂nanotube layers

Laser-induced crystallization of anodic TiO₂nanotube layers