Photoelectron Properties of Multi-Walled and Single-Walled Titania a Nanotubes

Константинова, Е. А.; Kytina, E. V.; Зайцев, В. Б.; Martyshov, M. N.; Savchuk, Timofey; Kamaleev, Maxim

doi:10.1134/s1990793122040224

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…Registered carbon also can be associated with carbon dangling bonds. Such carbon bonds can accumulate an excess negative charge, thereby contributing to greater photocatalytic activity during CO 2 conversion [31,38].…”

Section: Functional Properties Investigationmentioning

confidence: 99%

Effect of Thermal Treatment of Symmetric TiO2 Nanotube Arrays in Argon on Photocatalytic CO2 Conversion

et al. 2022

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Symmetric titania nanotube arrays (TiO2 NTs) are a well-known photocatalyst with a large surface area and band edge potentials suitable for redox reactions. Thermal treatment of symmetrical arrays of TiO2 nanotubes in argon was used to change the carbon content of the samples. The influence of the carbon content in the structure of symmetrical TiO2 NTs on their photoelectrochemical properties and photocatalytic activity in the conversion of CO2 into organic fuel precursors has been studied. The structure, chemical, and phase composition of obtained samples were studied by X-ray analysis, Raman spectroscopy, and SEM with energy dispersive analysis. It is established that carbon-related defects in the samples accumulate electrons on the surface required for the CO2 conversion reaction. It has been shown for the first time that varying the carbon content in symmetric TiO2 NTs arrays by annealing at different temperatures in argon makes it possible to control the yield of methane and methanol in CO2 conversion. It is revealed that too high a concentration of carbon dangling bonds promotes the growth of CO2 conversion efficiency but causes instability in this process. The obtained results show a high promise of symmetric carbon-doped TiO2 NTs arrays for the photocatalytic conversion of CO2.

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Section: Functional Properties Investigationmentioning

confidence: 99%

Effect of Thermal Treatment of Symmetric TiO2 Nanotube Arrays in Argon on Photocatalytic CO2 Conversion

et al. 2022

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“…Введение примесей в TiO 2 сопровождается образованием энергетических уровней в запрещенной зоне, и соответственно расширением спектра поглощения в видимую область [8]. Нами разработан новый оригинальный метод определения положения энергетических уровней примесных центров (дефектов) в запрещенной зоне наноструктурированных полупроводников с помощью спектроскопии электронного парамагнитного резонанса [9,10]. Комбинирование TiO 2 c узкозонными полупроводниками также приводит к поглощению видимого света с последующей инжекцией электронов в зону проводимости TiO 2 , что обеспечивает его фотокаталитическую активность.…”

Section: Introductionunclassified

Влияние условий синтеза на структурные, оптические и электрофизические свойства нанокомпозитов TiO-=SUB=-2-=/SUB=-/Cu-=SUB=-x-=/SUB=-O

Мартышов¹,

Павликов²,

Кытина³

et al. 2023

Журнал Технической Физики

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Nanocomposites based on anodic titanium oxide nanotubes with copper oxide nanoparticles were formed and their structural, optical, and electrophysical properties were studied. Defects in the structure of the samples were identified by electron paramagnetic resonance and it was shown that, as a result of copper oxide deposition, CuO nanoparticles were formed on the surface of nanotubes. It was found that the conductivity of the structure decreases by several orders of magnitude with an increase in the number of deposition cycles. It was shown that this effect could be associated with the formation of TiO2 /CuO heterojunctions on the nanotube surface. It was shown for the first time that an increase in the content of copper oxide in TiO2/CuxO nanocomposites was accompanied by a decrease in conductivity and an increase in the number of defects.

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“…The introduction of impurities into TiO 2 is accompanied by the formation of energy levels in the forbidden band and, accordingly, by the expansion of the absorption spectrum into the visible region [8]. We developed a new original method for determining the position of the energy levels of impurity sites (defects) in the forbidden band of nanostructured semiconductors using electron paramagnetic resonance spectroscopy [9,10]. The combination of TiO 2 with low-energy-gap semiconductors also leads to the visible light absorption with subsequent injection of electrons into the conduction band of TiO 2 , which ensures its photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Influence of Synthesis Conditions on the Structural, Optical, and Electrophysical Properties of TiO-=SUB=-2-=/SUB=-/Cu-=SUB=-x-=/SUB=-O Nanocomposites

et al. 2023

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Nanocomposites based on anodic titanium oxide nanotubes with copper oxide nanoparticles were formed and their structural, optical, and electrophysical properties were studied. Defects in the structure of the samples were identified by electron paramagnetic resonance and it was shown that, as a result of copper oxide deposition, CuO nanoparticles were formed on the surface of nanotubes. It was found that the conductivity of the structure decreases by several orders of magnitude with an increase in the number of deposition cycles. It was shown that this effect could be associated with the formation of TiO2/CuO heterojunctions on the nanotube surface. It was shown for the first time that an increase in the content of copper oxide in TiO2/CuxO nanocomposites was accompanied by a decrease in conductivity and an increase in the number of defects. Keywords: titanium oxide, nanotubes, nanocomposites, copper oxide nanoparticles, defects, conductivity.

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Photoelectron Properties of Multi-Walled and Single-Walled Titania a Nanotubes

Cited by 8 publications

References 20 publications

Effect of Thermal Treatment of Symmetric TiO2 Nanotube Arrays in Argon on Photocatalytic CO2 Conversion

Effect of Thermal Treatment of Symmetric TiO2 Nanotube Arrays in Argon on Photocatalytic CO2 Conversion

Влияние условий синтеза на структурные, оптические и электрофизические свойства нанокомпозитов TiO-=SUB=-2-=/SUB=-/Cu-=SUB=-x-=/SUB=-O

Influence of Synthesis Conditions on the Structural, Optical, and Electrophysical Properties of TiO-=SUB=-2-=/SUB=-/Cu-=SUB=-x-=/SUB=-O Nanocomposites

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