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

Wawrzyniak, Jakub; Karczewski, Jakub; Kupracz, Piotr; Coy, Emerson; Mazikowski, Adam; Ryl, Jacek; Siuzdak, Katarzyna

doi:10.1038/s41598-020-77309-2

Cited by 7 publications

(8 citation statements)

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“…The titania nanotube synthesis was reported previously elsewhere. , Prior to anodization, the titanium plate was ultrasonically cleaned in acetone, ethanol, and subsequently water. Single-step anodization of the titanium plate was performed in an electrolyte containing diethylene glycol/water/HF (69/5/1 vol %) and 9.4 mM NH 4 F. The anodization voltage was 30 or 40 V (as indicated in the text), the polarization time was 2 h, and the temperature was 40 °C.…”

Section: Methodsmentioning

confidence: 99%

Band Gap Engineering toward Semimetallic Character of Quinone-Rich Polydopamine

et al. 2023

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Semiconductor|melanin interfaces have received increasingly more attention in the fields of photocatalysis and applied electrochemistry because of their facile synthesis, unique electrical properties, and strong capability toward photosensitization. In this work, we describe the electropolymerization of quinone-rich polydopamine (PDA) on the surface of hydrogenated TiO 2 nanotubes with enhanced photoactivity in the visible spectrum. PDA is deposited uniformly on the nanotube walls, and the chemical structures of the resulting PDA layer strongly depend on the pH of the supporting electrolyte. The film thickness varies in the range of 2−8 nm depending on the number of electropolymerization cycles. Optical and electrochemical experiments coupled with density functional theory simulations revealed strong evidence of a semimetallic character of the junction with a broad distribution of midgap surface states induced by PDA. As a result of the nanotube modification, a 20-fold increase in the photocurrent response is observed. Quantum efficiency measurements show that the enhancement occurs mainly at wavelengths between 500 and 550 nm. Additionally, nonlinear electrochemical impedance spectroscopy experiments strongly suggest that, in the TiO 2 |PDA junction, PDA behaves as a set of redox mediators distributed at the surface rather than as a semiconducting polymer. This concept might be crucial for understanding the electronic properties of semiconductor|melanin junctions.

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Section: Methodsmentioning

confidence: 99%

Band Gap Engineering toward Semimetallic Character of Quinone-Rich Polydopamine

et al. 2023

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“…However, the effects of irradiation vary greatly when it is applied toward a free-standing (or self-standing) nanotube morphology [ 43 ]. Due to of the spacing between the nanotubes, the melted upper part cannot connect to the neighboring nanotubes; therefore, a uniform layer cannot form on top of the structure.…”

Section: The Laser-induced Morphological Transformation Of Titania Na...mentioning

confidence: 99%

“…TEM images of the hollow nanopillars from the top ( C ) and side ( D ). Reprinted with permission from [ 43 ].…”

Section: Figurementioning

confidence: 99%

“…As can be seen, the modification of TiO 2 NTs with laser radiation can be implemented using several different lasers which emit wavelengths from almost the whole spectrum. In most cases, the process leads to an amorphous-to-crystalline phase transition with a multi-fold increase in the measured photocurrent as well as a general enhancement of catalytic activity [ 35 , 40 , 41 , 42 , 43 ]. However, several drawbacks of the used treatment were also described.…”

Section: Introductionmentioning

confidence: 99%

“…In the work of Xu and Zangari [ 35 ], after increasing the laser fluence above 0.3 J/cm 2 , the amount of photoinduced charge carriers dropped significantly, resulting in a final decrease in the activity of the samples. Moreover, both Xu et al [ 40 ] and Wawrzyniak et al [ 43 ] observed an increment of formed structural defects, leading to a decrease in activity.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Side-Selective Laser Tailoring of Titania Nanotubes on Changes in Photoelectrocatalytic Activity

et al. 2023

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Over the last few decades, titanium(IV) oxide-based materials have gained particular attention due to their stability, corrosion resistance, photocatalytic activity under UV light, and possibilities for modification. Among various structures, TiO2 nanotubes (NTs) grown on Ti foil or glass substrates and obtained through a simple anodization process are widely used as photocatalysts or photoanodes. During the anodization process, the geometry of the nanotubes (length, distribution, diameter, wall thickness, etc.) is easily controlled, though the obtained samples are amorphous. Heat treatment is required to transform the amorphous material into crystalline material. However, instead of time- and cost-consuming furnace treatment, fast and precise laser annealing is applied as a promising alternative. Nonetheless, laser treatment can result in geometry changes of TiO2 NTs, consequently altering, their electrochemical activity. Moreover, modification of the TiO2 NTs surfaces with transition metals and further laser treatment can result in materials with unique photoelectrochemical properties. In this regard, we gathered the latest achievements in the field of laser-treated titania for this review paper. We mainly focused on single structural and morphological changes resulting from pulsed laser annealing and their influence on the electrochemical properties of titania. Finally, the theoretical basis for and combination of laser- and metal-modifications and their impact on the resulting possibilities for electrochemical water splitting are also discussed.

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Medical Implant Surface Technology: Geometrical Formation of Titania Nanotube Arrays by Divergence Anodization Parameters

et al. 2023

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Titania nanotube arrays (TNA) have high biocompatibility, less toxicity, and a large surface area per volume; thus, TNA offer great potential in biomedical applications. Interactions between micro environment and cell on the TNA surface are intensively investigated regarding cell attachment and interaction. Anodization was used to create a highly ordered nano-porous oxide layer with nano-sized pores on the surface of the titanium. This process was carried out at 30 V with a sweep rate of 1 V/sec for a different duration (10 s, 1 min, 2 min, 5 min, 10 min, 20 min, 30 min, 1 h, 2 h, 3 h and 6 h). On an anodized titanium surface, the cell adhesion of several adherence cells was observed using a eld emission scanning electron microscope (FESEM). Due to its important role in controlling the morphology of the nanotube structures, extending anodization time causes the length of the nanotubes increases. Hence, the optimised anodization time on the TNA surface at 30 V with a sweep rate of 1 V/s directly impacts cell adhesion after incubating for 48 h. The anodic potential of TNA was successfully obtained at 30 V with a sweep rate of 1 V/sec for 30 min, which could modulate diverse cellular responses of cell adhesion observed by FESEM.

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

Cited by 7 publications

References 50 publications

Band Gap Engineering toward Semimetallic Character of Quinone-Rich Polydopamine

Band Gap Engineering toward Semimetallic Character of Quinone-Rich Polydopamine

The Impact of Side-Selective Laser Tailoring of Titania Nanotubes on Changes in Photoelectrocatalytic Activity

Medical Implant Surface Technology: Geometrical Formation of Titania Nanotube Arrays by Divergence Anodization Parameters

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