Optical properties of titanium dioxide nanotube arrays

Mohamed, Alaa; Sokoloff, J. B.; Lu, W. T.; Close, Thomas; Menon, Latika; Richter, Christiaan

doi:10.1063/1.4847575

Cited by 11 publications

(4 citation statements)

References 64 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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“…Experimentally, the optical properties are greatly affected by the preparing technologies, such as the anodization voltages, and annealed temperature . The light incident on open or closed sides also affects the optical properties, especially the reflectance and absorbance properties . Furthermore, the nanotubes with different diameters show significant difference in adsorption spectra .…”

Section: Resultsmentioning

confidence: 99%

“… The light incident on open or closed sides also affects the optical properties, especially the reflectance and absorbance properties . Furthermore, the nanotubes with different diameters show significant difference in adsorption spectra . The experimental adsorption spectra of nanotube with the smallest diameter of 38 nm were selected to compare with our calculated results in order to decrease the quantum size effect.…”

Section: Resultsmentioning

confidence: 99%

Electronic Structure Controlling of Assembly and Optical Properties of TiO₂ Nanotube Arrays

Dai

Song

2016

ChemistrySelect

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First principles calculations are carried out to study the interaction between TiO2 nanotubes. Two type tubes, the (9, 0) and (0, 6) tubes, with different separations and arrangements are studied in detail. Interactions between ions from neighboring nanotubes and contact angle between tubes could greatly affect the stability of nanotube arrays. The (0, 6) nanotubes tend to contact with each other owing to the attracting interactions between Ti and O ions from different tubes, while the (9, 0) nanotubes prefer to distribute separately due to the repulsion between oxygen ions in neighboring nanotubes. The atomic configurations in contact zone and the electronic structures are further studied to clarify the controlling mechanisms of the stability of TiO2 nanotube arrays. Regulation of arrangement of TiO2 nanotube arrays bring diverse electronic and optical properties.

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“…The incident photon that enters on the open side of TNT arrays is randomly scattered, and some photons are backscattered as a diffuse back reflection. 41 However, at the near band edge, the wavelength dependence of back reflection is not larger than that of absorption. Therefore, we considered only absorption to estimate the L(λ), without the consideration of reflection and scattering.…”

Section: Resultsmentioning

confidence: 99%

Clarification of Photoelectrochemical Oxygen Evolution Sites in TiO₂ Nanotube Array Electrodes by PbO₂ Deposition Method

Amano

Nomura

Tateishi

et al. 2023

J. Electrochem. Soc.

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TiO2 nanotube (TNT) photoanodes exhibit activity and stability for the oxygen evolution reaction (OER) by photoelectrochemical water oxidation. However, the location of the OER site by the photogenerated holes has not been clarified for the TNT photoanodes, unlike well-studied macrocrystalline photocatalysts. In this study, we performed reactions of TNT photoanodes in a 0.1 M Pb(NO3)2 under UV irradiation. The photoelectrochemically deposited PbO2 particles were observed through scanning electron microscopy in the backscattered electron mode. We found that β-PbO2 was deposited on the nanotubes with photocurrent decay and that the reaction site was located on the upper part (~1 µm) of the TNT array with ~3 µm length. The photocurrent decay implies the selective deposition of PbO2 on the catalytic site for water oxidation. The PbO2 nanoparticles were deposited on the inner and outer surfaces of the tube walls. This result is consistent with the mechanism of charge separation at the space charge layers formed on both surfaces of the walls. We also confirmed that the OER site changes depending on the wavelength of the incident light due to the change in the light penetration depth.

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Optical properties of titanium dioxide nanotube arrays

Abstract: Articles you may be interested inRoom-temperature ferromagnetism and optical properties in Mg-doped TiO2: A density functional theory investigation

Cited by 11 publications

References 64 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

Electronic Structure Controlling of Assembly and Optical Properties of TiO₂ Nanotube Arrays

Clarification of Photoelectrochemical Oxygen Evolution Sites in TiO₂ Nanotube Array Electrodes by PbO₂ Deposition Method

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Optical properties of titanium dioxide nanotube arrays

Abstract: Articles you may be interested inRoom-temperature ferromagnetism and optical properties in Mg-doped TiO2: A density functional theory investigation

Cited by 11 publications

References 64 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

Electronic Structure Controlling of Assembly and Optical Properties of TiO2 Nanotube Arrays

Clarification of Photoelectrochemical Oxygen Evolution Sites in TiO2 Nanotube Array Electrodes by PbO2 Deposition Method

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Electronic Structure Controlling of Assembly and Optical Properties of TiO₂ Nanotube Arrays

Clarification of Photoelectrochemical Oxygen Evolution Sites in TiO₂ Nanotube Array Electrodes by PbO₂ Deposition Method