Direct formation of new, phase-stable, and photoactive anatase-type Ti1−2Nb Sc O2 solid solution nanoparticles by hydrothermal method

Hirano, Masanori; Ito, Takaharu

doi:10.1016/j.materresbull.2007.08.027

Cited by 22 publications

(17 citation statements)

References 34 publications

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“…(3) Effect of mineralizers Urea as an excellent mineralizer has been widely used to synthesize various types of inorganic nanomaterials [27][28][29]. In previous reports, Bi 2 S 3 nanostructures and microstructures were successfully fabricated by hydrothermal (or solvothermal) method using NaOH and KOH as the mineralizers at >150 °C [15][16]30].…”

Section: Resultsmentioning

confidence: 99%

Low‐temperature urea‐assisted hydrothermal synthesis of Bi₂S₃ nanostructures with different morphologies

Zhu¹,

Liu

2009

Cryst. Res. Technol.

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Different morphologies of single-crystalline orthorhombic phase bismuth sulfide (Bi 2 S 3 ) nanostructures, including sub-microtubes, nanoflowers and nanorods were synthesized by a urea-assisted hydrothermal method at a low temperature below 120 °C for 12 h. The as-synthesized powders were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), highresolution transmission electron microscopy (HRTEM) and UV-vis spectrophotometry. The experimental results showed that the sulfur sources had a great effect on the morphology and size of the resulting powders. The formation mechanism of the Bi 2 S 3 nanostructures with different morphologies was discussed. All Bi 2 S 3 nanostructures showed an appearance of blue shift relative to the bulk orthorhombic Bi 2 S 3 , which might be ascribed to the quantum size effect of the final products.

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Section: Resultsmentioning

confidence: 99%

Low‐temperature urea‐assisted hydrothermal synthesis of Bi₂S₃ nanostructures with different morphologies

Zhu¹,

Liu

2009

Cryst. Res. Technol.

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“…To attain the crystallite growth the same as the anatase with pure TiO 2 composition, much higher heating temperature more than 200°C was necessary for the anatase in the samples with composition Eu x Ti 1–2 x Nb x O 2 , which is considered to be the cause of the enhancement of the phase stability of anatase. A single phase of rutile‐type M x Ti 1–2 x Nb x O 2 (M = Eu) is not formed through the phase transformation in the same composition range as the cases of co‐dopant M = Sc, Al, and Ga, which may be due to a little larger ionic radius of Eu(III) than that of Sc(III), Al(III), and Ga(III) …”

Section: Resultsmentioning

confidence: 97%

Hydrothermal Synthesis of Nb‐ and Eu‐ Co‐Substituted Nanocrystalline Anatase: Eu_xTi_1–2xNb_xO₂ with Photoluminescence and Photocatalytic Activity: Compositional Dependence of Multifunctional Properties

Hirano

Sato

2012

J. Am. Ceram. Soc.

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Nanocrystalline titania (EuxTi1–2xNbxO2, x = 0–0.15) co‐substituted with europium (Eu) and niobium (Nb) having photoluminescence (PL) and photocatalytic activity was formed as a single phase of anatase‐type structure from the precursor solutions of TiOSO4, NbCl5, and EuCl3 under mild hydrothermal conditions using the hydrolysis of urea. The amount of Eu and Nb that can be co‐doped into a metastable anatase‐type TiO2 lattice under hydrothermal conditions was limited up to 15 mol%, respectively, above which the aeschynite EuTiNbO6 coexisted with anatase. The nanocrystalline titania can be excited by ultraviolet light 395 nm (f–f transition) and emits red light (611 nm) with line spectrum corresponding to 5D0–7F2 transition. The PL intensity increased with increased replacement amount of Eu and Nb. The anatase solid solution co‐doped with 5 mol% Eu and 5 mol% Nb (x = 0.05) showed a similar activity to pure anatase (x = 0) on the photodecomposition of methylene blue under UV light irradiation. The anatase‐to‐rutile phase transformation was delayed via the copresence of Eu and Nb component. In the course of heating and the growth of anatase crystallite, a part of the dopants that could not exist in the titania precipitated as euxenite phase EuTiNbO6 from the anatase at 900°C–1000°C before the phase transformation.

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“…As an excellent mineralizer, urea has been widely used to synthesize various types of inorganic nano-and micron-sized inorganic materials [20][21][22]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Self-assembly of SnS2 submicron-sized flakes to form microspheres under template-free hydrothermal conditions

Peng

et al. 2010

Journal of Alloys and Compounds

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Direct formation of new, phase-stable, and photoactive anatase-type Ti1−2Nb Sc O2 solid solution nanoparticles by hydrothermal method

Cited by 22 publications

References 34 publications

Low‐temperature urea‐assisted hydrothermal synthesis of Bi₂S₃ nanostructures with different morphologies

Low‐temperature urea‐assisted hydrothermal synthesis of Bi₂S₃ nanostructures with different morphologies

Hydrothermal Synthesis of Nb‐ and Eu‐ Co‐Substituted Nanocrystalline Anatase: Eu_xTi_1–2xNb_xO₂ with Photoluminescence and Photocatalytic Activity: Compositional Dependence of Multifunctional Properties

Self-assembly of SnS2 submicron-sized flakes to form microspheres under template-free hydrothermal conditions

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Direct formation of new, phase-stable, and photoactive anatase-type Ti1−2Nb Sc O2 solid solution nanoparticles by hydrothermal method

Cited by 22 publications

References 34 publications

Low‐temperature urea‐assisted hydrothermal synthesis of Bi2S3 nanostructures with different morphologies

Low‐temperature urea‐assisted hydrothermal synthesis of Bi2S3 nanostructures with different morphologies

Hydrothermal Synthesis of Nb‐ and Eu‐ Co‐Substituted Nanocrystalline Anatase: EuxTi1–2xNbxO2 with Photoluminescence and Photocatalytic Activity: Compositional Dependence of Multifunctional Properties

Self-assembly of SnS2 submicron-sized flakes to form microspheres under template-free hydrothermal conditions

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Low‐temperature urea‐assisted hydrothermal synthesis of Bi₂S₃ nanostructures with different morphologies

Low‐temperature urea‐assisted hydrothermal synthesis of Bi₂S₃ nanostructures with different morphologies

Hydrothermal Synthesis of Nb‐ and Eu‐ Co‐Substituted Nanocrystalline Anatase: Eu_xTi_1–2xNb_xO₂ with Photoluminescence and Photocatalytic Activity: Compositional Dependence of Multifunctional Properties