Synthesis of Composite Based on Carbon Nanotubes and Anodic Titania

Камалов, Р. В.; Вохминцев, А. С.; Дорошева, И. Б.; Kravets, N. N.; Weinstein, I. A.

doi:10.1166/asl.2016.6997

Cited by 11 publications

(4 citation statements)

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“…Although titanium dioxide has been the subject of wide experimental [9,[24][25][26][27][28][29][30] and theoretical [31][32][33][34][35] investigations, the full scope of its photocatalytic and antibacterial properties, as well as their potential enhancements, remains an open field for exploration. State-of-the-art spectroscopy can analyze electronic structure at the atomic scale, including binding energies [36,37] and imaging reaction sites [38].…”

Section: Introductionmentioning

confidence: 99%

Excited State Calculations of Cu-Doped Anatase TiO2 (101) and (001) Nanofilms

Lin,

Neilande,

Bandarenka

et al. 2024

Crystals

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Excited state calculations are performed to predict the electronic structure and optical absorption characteristics of Cu-doped anatase TiO2 nanofilms, focusing on their (101) and (001) surface terminations. Using model structures that successfully represent the equilibrium positions of deposited Cu atoms on the TiO2 surface, a comprehensive analysis of the absorption spectra for each considered model is made. The proposed modeling reveals phenomena when photogenerated electrons from TiO2 tend to accumulate in the vicinity of the deposited Cu atoms exposed to photon energies surpassing the band gap of TiO2 (approximately 3.2 eV). The crucial transition states that are essential for the creation of potential photocatalytic materials are identified through detailed calculations of the excited states. These insights hold substantial promise for the strategic design of advanced photocatalytic materials. The obtained results provide a base for subsequent analyses, facilitating the determination of heightened surface reactivity, photostimulated water splitting, and antibacterial properties.

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Section: Introductionmentioning

confidence: 99%

Excited State Calculations of Cu-Doped Anatase TiO2 (101) and (001) Nanofilms

Lin,

Neilande,

Bandarenka

et al. 2024

Crystals

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“…In this regard, the material is modified in various ways: by creating a heterostructure, doping with metal ions, annealing in atmospheres of air, hydrogen, argon, nitrogen, etc. [42][43][44][45][46][47][48][49] to create atomic defects and surface states capable to capture photons with lower energy. One of the instruments for study such states is the surface photovoltage spectroscopy (SPS), which allows a non-contact, non-destructive and highly sensitive way to determine the electronic features in surface of solids and can be used to analyze charges separation and transfer in the mechanisms of photocatalysis, dye sensitization, etc.…”

Section: Introductionmentioning

confidence: 99%

Induced surface photovoltage in TiO2 sol-gel nanoparticles

Dorosheva,

Vokhmintsev,

Weinstein

et al. 2023

Nanosystems: Phys. Chem. Math.

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TiO 2 nanoparticles synthesized by the sol-gel method and modified by annealing in air and hydrogen atmospheres were studied by surface photovoltage spectroscopy (SPS). SPS measurements showed that the modified in air TiO 2 nanoparticles have a more intense signal than those treated in hydrogen. A linear correlation was found between the SPS and the diffuse reflectance spectra of the samples. KEYWORDS Titanium dioxide, sol-gel method, nanoparticles, surface photovoltage (SPV). ACKNOWLEDGEMENTS A.S.V. and I.A.W. thank the Ministry of Science and Higher Education of the Russian Federation (research project FEUZ-2023-0014) for support. Part of synthesis of titanium dioxide carried out within the framework of RF State assignment for IMET UB RAS.

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“…Titanium dioxide (TiO 2 ) is one of the most popular materials with photocatalytical activity that is known to provide irreversible chemical transformation of organic molecules [13][14][15]. TiO 2 nanostructures can be synthesized using various methods including anodic oxidation [16], sol-gel [17,18], hydrothermal [19] and extraction pyrolytic [20] techniques. Therefore, different morphological forms have been actively used to improve disinfecting features of PPE [21].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Heat Dissipation in Ag/Ni Substrates for Testing Cu-TiO2/TiO2-Modified Filters Using SERS Spectroscopy

et al. 2023

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Surface-enhanced Raman scattering (SERS) spectroscopy is used to investigate a composition of wash swabs from the Cu-TiO2/TiO2-modified filters with disinfecting ability. Macroporous Si chips coated with conformal 800 nm thick Ni layer and Ag particles (Ag/Ni) are engineered to act as SERS-active substrates. Such substrates are characterized by a moderate reflection band in the visible range and provide an improved heat dissipation from contaminants in wash swabs during SERS study. This prevents thermal-induced destruction of analyzing media for reliable assessment of its composition. The anatase Cu-TiO2 and TiO2 nanoparticles are synthesized using the sol-gel method and characterized via Raman spectroscopy and X-ray diffractometry. The filters are modified with Cu-TiO2/TiO2 nanoparticles and embedded in three-valve facial masks that are worn by a volunteer to breathe for 4 h. Comparative SERS analysis of the filters shows that they slightly destroy chemical bonds in the molecules constituting airborne contaminations upon ceiling day lights, which can be associated with Cu-TiO2 photocatalytic activity. The filters additionally exposed to near-ultraviolet light prominently decrease the intensity of Raman signatures of airborne contaminant due to the presence of pure TiO2.

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Synthesis of Composite Based on Carbon Nanotubes and Anodic Titania

Cited by 11 publications

References 0 publications

Excited State Calculations of Cu-Doped Anatase TiO2 (101) and (001) Nanofilms

Excited State Calculations of Cu-Doped Anatase TiO2 (101) and (001) Nanofilms

Induced surface photovoltage in TiO2 sol-gel nanoparticles

Improvement of Heat Dissipation in Ag/Ni Substrates for Testing Cu-TiO2/TiO2-Modified Filters Using SERS Spectroscopy

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