Aqueous solution-based synthesis of rare earth-doped metal oxide thin films

Deki, Shigehito; Kuratani, Kentaro; Uemura, Mariko; Akamatsu, Kensuke; Mizuhata, Minoru; Kajinami, Akihiko

doi:10.1016/j.tsf.2004.01.077

Cited by 21 publications

(11 citation statements)

References 19 publications

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“…Small amounts (less than 1%) of pyrochlore-type Eu 2 Ti 2 O 7 nanophases also appear in the specimen heated above 900 °C, recognized on the appearance of (222) reflex near 30°. 32,33 Finally, we can observe a slight shift of the diffraction lines to smaller 2Θ values as the result of Eu 3+ doping. This apparent expansion of interplanar distances we relate to a larger size of the Eu 3+ ion (0.95 Å, octahedral coordination) compared to that of Zn 2+ (0.60 Å) and Ti 4+ (0.61 Å) occupying tetrahedral and octahedral sites of the spinel.…”

Section: Resultsmentioning

confidence: 72%

Evolution and Eu³⁺ Doping of Sol−Gel Derived Ternary Zn_xTi_yO_z - Nanocrystals

et al. 2010

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Alloyed Zn x Ti y O z nanostructures were prepared by a thermal condensation process employing ethanolic mixtures of zinc acetate dihydrate and titanium alkoxide, without additional use of additives. It has been found that the nanocrystal growth takes place at temperatures above 350 °C yielding cubic spinel Zn2TiO4, cubic ZnTiO3, or hexagonal ilmenite ZnTiO3. Their preferential appearance and size tuning between 5 and 80 nm was possible by varying the starting sol condensation conditions, Zn/Ti-ratio and sintering temperature. The electronic transitions in these ternary oxide semiconductor nanocrystals were observed at photon energies between 3.6 and 3.8 eV that reflects the presence of a wider optical gap than that known for the corresponding binary oxides ZnO and TiO2. We also noticed a strong influence of Eu3+ doping on the resulting structural and optical properties. Despite its large ionic size, this lanthanide efficiently intervenes in the evolution process by blocking the nanocrystal growth and the cubic-to-hexagonal transformation in ZnTiO3. Its preferential incorporation into spinel phase is manifested by the activation of a strong red intrashell fluorescence and a significant Stark splitting of the 5FJ states. The comparison of the spectral response and asymmetry ratio values deduced from the experimental Eu3+ luminescence data collected on structurally similar Zn2TiO4 and ZnTiO3 nanophases suggests the hypothesis that cubic ZnTiO3 has a structure of an inverse defect spinel. Our study has not confirmed the existence of the previously reported and often recalled defect spinel Zn2Ti3O8.

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Section: Resultsmentioning

confidence: 72%

Evolution and Eu³⁺ Doping of Sol−Gel Derived Ternary Zn_xTi_yO_z - Nanocrystals

et al. 2010

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“…Since the formation of oxide films occurs in aqueous solutions of metal-fluoro complex, which are the typical homogeneous mixing system, homogeneous composite thin films can be readily prepared by the LPD methods. S. Deki et al have deposited rare earth-doped Titanium dioxide thin films on glass and Si wafer substrates through the LPD process [21].…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Preparing V-doped Titanium Dioxide Thin Film Photocatalysts with High Photocatalytic Activity Under Visible Light Irradiation

Yang

2007

Catal Lett

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The liquid phase deposition (LPD) method was successfully used for preparing V-doped TiO 2 thin film photocatalysts. In this simple and easily-controlled process, V-doped anatase TiO 2 thin films were directly deposited on a soda lime glass substrate placed in an aqueous solution containing Ti-and V-fluoro complex ions, followed by annealing. The thin films were analyzed by XRD, XPS, UV-vis. V 4+ ions were introduced into the lattice of TiO 2 through in-situ substituting Ti 4+ . The absorption edge of V-doped TiO 2 films shifted to visible light region. The highly efficient photocatalytic activity was verified by the decomposition of methylene blue under visible light irradiation.

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“…In our previous studies, an organic ligand, such as EDTA, had been used as masking reagent for Ln 3+ ions to prevent the formation of LnF 3 precipitates in the LPD solution [19]. In this paper, we report a new preparation method and luminescence property of transparent Eu 3+ -doped ZrO 2 thin films by the LPD method.…”

Section: Introductionmentioning

confidence: 99%