Electro-Optics and Band Gap Energies of Nanosilver-Coated TiO2 Nanotubes on Titanium Metal

Olgun, Uğursoy; Gülfen, Mustafa; Üstel, Fatih; Arslan, Hale

doi:10.1007/s40195-017-0664-6

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…As expected, all the samples show high absorbance values for wavelengths lower than 380 nm, in line with the anatase TiO 2 composition of the NTs. Moreover, periodic absorption signals are always present even in the undecorated TiO 2 sample: this spectroscopic effect is most likely due to scattering inside the nanotube array [53] as already reported in previous works [54,55]. Interesting differences were found when decorating TiO 2 with BC NPs.…”

Section: Characterization Of Tio 2 and Bc-tio 2 Photocatalystssupporting

confidence: 69%

Biochar Nanoparticles over TiO2 Nanotube Arrays: A Green Co-Catalyst to Boost the Photocatalytic Degradation of Organic Pollutants

et al. 2021

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Biochar nanoparticles (BC NPs), produced by low temperature pyrolysis (350 °C) of microalgae (Nannochloropsis sp.) and nutshells, are proposed as low-cost and sustainable co-catalysts to promote the photocatalytic activity of TiO2 nanotube (NT) arrays towards the degradation of methylene blue (MB) used as an organic pollutant model molecule. BC NPs (size < 25 nm) were obtained by treating bulk BC (i.e., biomass after pyrolysis) by sonication–centrifugation cycles in a water solution. The filtered BC NPs dispersion was deposited by simple drop-casting on the TiO2 NT support. The BC loading was varied by performing multiple depositions. Photocatalytic experiments under UV light (365 nm) revealed that the decoration with BC NPs significantly improves the TiO2 photoactivity. Such enhancement is mainly influenced by the amount of BC deposited; upon optimizing the BC deposition conditions, the rate of photocatalytic degradation of MB increases approximately three times with respect to bare TiO2, almost irrespective of the nature of the raw material. The greater photocatalytic activity of BC-TiO2 can be attributed to the synergistic combination of reactant/product adsorption and catalytic degradation of the adsorbed organic pollutant, as well as an improved charge carrier separation and electron transfer.

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Section: Characterization Of Tio 2 and Bc-tio 2 Photocatalystssupporting

confidence: 69%

Biochar Nanoparticles over TiO2 Nanotube Arrays: A Green Co-Catalyst to Boost the Photocatalytic Degradation of Organic Pollutants

et al. 2021

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“…Total intracellular RNA was isolated to perform the qPCR analysis of Arg1 c. *P < 0.05 versus cell 1 3 [6]. Titanium dioxide nanotubes (NT) have been well studied previously [21,22]. Our previous study demonstrated that the 30 nm diameter NT (NT-30) has an intrinsic potential to induce macrophage polarization toward the M2 direction Fig.…”

Section: Discussionmentioning

confidence: 99%

Inducing Macrophages M2 Polarization by Dexamethasone Laden Mesoporous Silica Nanoparticles from Titanium Implant Surface for Enhanced Osteogenesis

Luo

Ding

Song

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The study conveys an idea to enhance the osseointegration of titanium implant (Ti) through modulating macrophages M2 polarization. The ~ 100 nm spherical mesoporous silica nanoparticles (MSN) that compromised of ~ 4-nm-diameter nanotunnels were synthesized by the conventional "sol-gel" method, into which the dexamethasone (DEX) was loaded (DEX@ MSN). The DEX@MSN could consistently release DEX and showed favorable cytocompatibility in RAW264.7 cells. The arginase-1 expression, a specific marker for macrophages M2 polarization, was also enhanced by DEX@MSN treatment. Then, the Ti was pre-treated with anodization under 5 V to generate the titania nanotubes with ~ 30 nm diameter (NT-30) and the DEX@MSN was introduced onto NT-30 surface via electrophoretic deposition, with the aid of chitosan. After optimizing the deposition parameters, the supernatants of RAW264.7 from the decorated implant surface could significantly promote the osteogenic differentiation of murine primary bone marrow mesenchymal stem cells. These findings demonstrate that delivery of DEX from implant surface can modulate the macrophages M2 polarization and result in favorable osteogenesis.

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“…It should be noted that the electrocatalytic activity of catalysts increases along with an increase in the Pt loading on the TiO 2 support. In order to deposit metallic nanoparticles on nanotubes, various methods of deposition have been used, including electrodeposition, 14 photochemical reduction, 15 and magnetron deposition. 16 The filling of narrow channels of nanotubes with metal nanoparticles is challenging technologically, and so the choice of a suitable method is crucial for proper structural optimization.…”

Section: ■ Introductionmentioning

confidence: 99%

Effect of Pt Deposits on TiO₂ Electrocatalytic Activity Highlighted by Electron Tomography

Andrzejczuk

Roguska

Pisarek

et al. 2019

ACS Appl. Mater. Interfaces

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Characterizing materials at small scales presents major challenges in the engineering of nanocomposite materials having a high specific surface area. Here, we show the application of electron tomography to describe the three-dimensional structure of highly ordered TiO2 nanotube arrays modified with Pt nanoparticles. The titanium oxide nanotubes were prepared by the electrochemical anodization of a Ti substrate after which Pt was deposited by magnetron sputtering. Such a composite shows high electrochemical activity that depends on the amount of the metal and the morphological parameters of the microstructure. However, a TiO2 structure modified with metallic nanoparticles has never been visualized in 3D, making it very difficult to understand the relationship between electrocatalytic activity and morphology. In this paper, TiO2 nanotubes of different sizes and different amounts of Pt were analyzed using the electron microscopy technique. Electrocatalytic activity was studied using the cyclic voltammetry (CV) method. For selected samples, electron tomography 3D structure reconstruction was performed to describe their fine microstructure. The highest activity was detected in the sample having bigger nanotubes (25 V) where the porosity of the structure was high and the Pt content was 0.1 mg cm–2. 3D imaging using electron tomography opens up new possibilities in the design of electrocatalytic materials.

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Electro-Optics and Band Gap Energies of Nanosilver-Coated TiO2 Nanotubes on Titanium Metal

Cited by 8 publications

References 38 publications

Biochar Nanoparticles over TiO2 Nanotube Arrays: A Green Co-Catalyst to Boost the Photocatalytic Degradation of Organic Pollutants

Biochar Nanoparticles over TiO2 Nanotube Arrays: A Green Co-Catalyst to Boost the Photocatalytic Degradation of Organic Pollutants

Inducing Macrophages M2 Polarization by Dexamethasone Laden Mesoporous Silica Nanoparticles from Titanium Implant Surface for Enhanced Osteogenesis

Effect of Pt Deposits on TiO₂ Electrocatalytic Activity Highlighted by Electron Tomography

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Electro-Optics and Band Gap Energies of Nanosilver-Coated TiO2 Nanotubes on Titanium Metal

Cited by 8 publications

References 38 publications

Biochar Nanoparticles over TiO2 Nanotube Arrays: A Green Co-Catalyst to Boost the Photocatalytic Degradation of Organic Pollutants

Biochar Nanoparticles over TiO2 Nanotube Arrays: A Green Co-Catalyst to Boost the Photocatalytic Degradation of Organic Pollutants

Inducing Macrophages M2 Polarization by Dexamethasone Laden Mesoporous Silica Nanoparticles from Titanium Implant Surface for Enhanced Osteogenesis

Effect of Pt Deposits on TiO2 Electrocatalytic Activity Highlighted by Electron Tomography

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Effect of Pt Deposits on TiO₂ Electrocatalytic Activity Highlighted by Electron Tomography