Characterization of nitrogen ion implanted TiO2 photocatalysts by XAFS and XPS

Yoshida, Tomoko; Niimi, Satoshi; Yamamoto, Masato; Ogawa, Soichi; Nomoto, T.; Yagi, Shunsuke

doi:10.1016/j.nimb.2015.04.010

Cited by 12 publications

(10 citation statements)

References 11 publications

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“…In this regard, nitrogen-doping has been considered one of most effective approaches to improve photocatalytic activity of TiO 2 in the visible region [25]. The methods currently reported to achieve it superficially or by replacing atoms include ion implantation [26], physical vapor deposition [27], and spray pyrolysis [28], as well as variants of the known process of sol-gel. An alternative method to include nitrogen is the refluxing methodology, which consists of inducing intimate contact between the nitrogen source precursor (hydrazine, urea, ethylene diamine, etc.)…”

Section: Introductionmentioning

confidence: 99%

Comparing the Efficiency of N-Doped TiO2 and N-Doped Bi2MoO6 Photo Catalysts for MB and Lignin Photodegradation

et al. 2018

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In this study, we tested the efficiency of nitrogen-doped titanium dioxide (N-TiO2) and nitrogen-doped bismuth molybdate (N-Bi2MoO6) compounds as photocatalysts capable of degrading methylene blue and lignin molecules under irradiation with ultraviolet (UV) and visible light (VIS). Moreover, we compared TiO2 and Bi2MoO6 catalysts with N-TiO2 and N-Bi2MoO6 compounds using chemical coprecipitation. The catalysts were prepared starting from Ti(OCH2CH2CH3)4, Bi(NO3)3·5H2O, and (NH4)6Mo7O24 reagents. N-doping was achieved in a continuous reflux system, using ethylene diamine as a nitrogen source. The resulting materials were characterized using Scanning Electron Microscopy (SEM), X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Additionally, we observed the decrease in particle size after processing the compounds in the reflux system. The results regarding photocatalytic degradation tests show a remarkable effect for nitrogen doped samples, achieving 90% of lignin degradation.

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Section: Introductionmentioning

confidence: 99%

Comparing the Efficiency of N-Doped TiO2 and N-Doped Bi2MoO6 Photo Catalysts for MB and Lignin Photodegradation

et al. 2018

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“…In our previous study, we have found that O–Ti–N species in TiO 2 contributed to visible-light responsiveness. 19−21 Thus, the formation of O–Ti–N bonding in TiO x N y is most likely the origin of the photocatalytic water splitting under visible-light irradiation. Actually, as shown in Figures 1 and 2, higher nitriding temperature led to higher photocatalytic activity with the increase in the intensity of the peak due to TiO x N y in XRD.…”

Section: Discussionmentioning

confidence: 99%

TiO_xN_y/TiO₂ Photocatalyst for Hydrogen Evolution under Visible-Light Irradiation. I: Characterization of N in TiO_xN_y/TiO₂ Photocatalyst

et al. 2019

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TiOxNy/TiO2 was synthesized by nitriding of TiO2 in NH3 gas. TiOxNy/TiO2 generated hydrogen from methanol aqueous solution under visible-light irradiation. It was revealed by N K-edge XANES and N 1s XPS measurements that the N species contributing to visible-light responsiveness was the O-Ti-N species. The structure of TiOxNy/TiO2 showing the photocatalytic activity was a double shell type with thin layers of TiOxNy that covers the TiO2 core. Although N content on the surface decreased during the photocatalytic reaction, N was supplied from the deeper side to keep the TiOxNy phase at the surface and the activity as well.

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“…In the fitting procedure of the bulk Si (substrate) XRR curve the X-ray beam energy was assumed to 6 keV, material (Si) thickness was set to 1 mm (infinitely thick for this energy) and initial Si density to 2.33 g/cm 3 . The fitting parameters were: density and roughness of the substrate.…”

Section: Unmodified Tio 2 Nanolayersmentioning

confidence: 99%

“…We also have made the attempt to model our samples with only one layer on the substrate, but it was not possible to obtain an acceptable fit of the reflectivity curves. Finally, in the fitting procedure of the TiO 2 nanolayers the X-ray beam energy was set to 6 keV, initial nanolayer thicknesses were set to 25, 50, and 75 nm, respectively, and initial TiO 2 density to 4.0 g/cm 3 . The initial top layer density was set to 2.0 g/cm 3 and the layer thickness to 2 nm.…”

Section: Unmodified Tio 2 Nanolayersmentioning

confidence: 99%

“…The modification of the nanolayers and production of surface nanostructures on metals, semiconductors, and oxides are of great importance in many fields of science, for example, to develop new production technologies of electronics systems with nanometer dimensions [1][2][3][4]. Among many tested materials, the studies of the surface modification of titanium and titanium oxides are particularly important because of their widespread use in biomedical devices and components [5].…”

Section: Introductionmentioning

confidence: 99%

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Application of Synchrotron Radiation Based X-ray Reflectometry in Analysis of TiO₂ Nanolayers, Unmodified and Irradiated with Xe^q+ Ions

et al. 2020

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In this work synchrotron radiation based X-ray reflectometry method was applied for determination of morphology of TiO2 nanolayers, unmodified, and irradiated with low energy highly charged Xe q+ ions. Using the synchrotron radiation based X-ray reflectometry technique density, thickness, and roughness of the TiO2 nanolayers were determined. The results showed that the thicknesses of the nanolayers obtained with synchrotron radiation based X-ray reflectometry method agree within the experimental uncertainty with the declared thicknesses. Moreover, the density of the nanolayers is much lower than density of the bulk TiO2 due to their nanometer thickness. The results obtained for irradiated samples suggest possible amorphization and smoothening of the TiO2 nanolayers surface due to interactions of the highly charged ions.

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Characterization of nitrogen ion implanted TiO2 photocatalysts by XAFS and XPS

Cited by 12 publications

References 11 publications

Comparing the Efficiency of N-Doped TiO2 and N-Doped Bi2MoO6 Photo Catalysts for MB and Lignin Photodegradation

Comparing the Efficiency of N-Doped TiO2 and N-Doped Bi2MoO6 Photo Catalysts for MB and Lignin Photodegradation

TiO_xN_y/TiO₂ Photocatalyst for Hydrogen Evolution under Visible-Light Irradiation. I: Characterization of N in TiO_xN_y/TiO₂ Photocatalyst

Application of Synchrotron Radiation Based X-ray Reflectometry in Analysis of TiO₂ Nanolayers, Unmodified and Irradiated with Xe^q+ Ions

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Characterization of nitrogen ion implanted TiO2 photocatalysts by XAFS and XPS

Cited by 12 publications

References 11 publications

Comparing the Efficiency of N-Doped TiO2 and N-Doped Bi2MoO6 Photo Catalysts for MB and Lignin Photodegradation

Comparing the Efficiency of N-Doped TiO2 and N-Doped Bi2MoO6 Photo Catalysts for MB and Lignin Photodegradation

TiOxNy/TiO2 Photocatalyst for Hydrogen Evolution under Visible-Light Irradiation. I: Characterization of N in TiOxNy/TiO2 Photocatalyst

Application of Synchrotron Radiation Based X-ray Reflectometry in Analysis of TiO2 Nanolayers, Unmodified and Irradiated with Xeq+ Ions

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TiO_xN_y/TiO₂ Photocatalyst for Hydrogen Evolution under Visible-Light Irradiation. I: Characterization of N in TiO_xN_y/TiO₂ Photocatalyst

Application of Synchrotron Radiation Based X-ray Reflectometry in Analysis of TiO₂ Nanolayers, Unmodified and Irradiated with Xe^q+ Ions