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| Home > Publications database > General Synthesis of Ordered Mesoporous Rare-Earth Orthovanadate Thin Films and Their Use as Photocatalysts and Phosphors for Lighting Applications |
| Home > Publications database > General Synthesis of Ordered Mesoporous Rare-Earth Orthovanadate Thin Films and Their Use as Photocatalysts and Phosphors for Lighting Applications |
| Journal Article | PUBDB-2019-01329 |
; ;
2019
ACS Publications
Washington, DC
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Please use a persistent id in citations: doi:10.1021/acsanm.8b02327 doi:10.3204/PUBDB-2019-01329
Abstract: The block copolymer templating sol–gel synthesis of a novel class of ternary oxide nanomaterials is reported. NdVO$_4$, EuVO$_4$, GdVO$_4$, DyVO$_4$, YVO$_4$, and TmVO$_4$ have been prepared as open mesoporous films by the dip-coating method using hydrated rare-earth nitrate salt precursors along with vanadium oxytrichloride. All materials crystallize in the tetragonal ZrSiO$_4$-type structure with space group I4$_1$/amd. Short-term treatment at 550 °C is found sufficient to initiate crystallization. Characterization via X-ray and electron diffraction, Raman and X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry confirms the single-phase nature and uniformity of the different orthovanadates with tailorable crystallite sizes. The integrated results from electron and atomic force microscopy, Kr physisorption, and in situ and ex situ synchrotron-based small-angle X-ray scattering reveal that the porosity persists throughout the thickness of films, and the mesoscopic ordering is retained even after heating in air at 700 °C. Photobleaching experiments indicate that the sol–gel derived materials, showing an indirect band gap transition at 3.8 ± 0.1 eV, exhibit good photocatalytic properties—the activity is highly superior to that of bulk films of the same nominal composition. Moreover, when doping GdVO$_4$, YVO$_4$, and solid solution GdVO$_4$–YVO$_4$ with trivalent rare-earth ions such as Eu$^{3+}$, Dy$^{3+}$, Er$^{3+}$, or Tm$^{3+}$ ions, the films hold promise as phosphors for lighting applications, which might pave the way toward development of (3-dimensional) intricate nanocomposites with unprecedented functionalities.
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