Journalartikel

Jahr der Veröffentlichung: 2019

Seiten: 1063-1071

Zeitschrift: ACS Applied Nano Materials

Bandnummer: 2

Heftnummer: 2

ISSN: 2574-0970

Open Access Status: Green

DOI Link: https://doi.org/10.1021/acsanm.8b02327

Verlag: American Chemical Society

Abstract: 
The block copolymer templating sol-gel synthesis of a novel class of ternary oxide nanomaterials is reported. NdVO4, EuVO4, GdVO4, DyVO4, YVO4, and TmVO(4 )have been prepared as open mesoporous films by the dipcoating method using hydrated rare-earth nitrate salt precursors along with vanadium oxytrichloride. All materials crystallize in the tetragonal ZrSiO4-type structure with space group I4(1)/ amd. Short-term treatment at 550 degrees 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 degrees 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 GdVO4, YVO4, and solid solution GdVO4 -YVO4 with trivalent rare-earth ions such as Eu3+, Dy3+, Er3+, 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.

Harvard-Zitierstil: Reitz, C., Smarsly, B. and Brezesinski, T. (2019) General Synthesis of Ordered Mesoporous Rare-Earth Orthovanadate Thin Films and Their Use as Photocatalysts and Phosphors for Lighting Applications, ACS Applied Nano Materials, 2(2), pp. 1063-1071. https://doi.org/10.1021/acsanm.8b02327

APA-Zitierstil: Reitz, C., Smarsly, B., & Brezesinski, T. (2019). General Synthesis of Ordered Mesoporous Rare-Earth Orthovanadate Thin Films and Their Use as Photocatalysts and Phosphors for Lighting Applications. ACS Applied Nano Materials. 2(2), 1063-1071. https://doi.org/10.1021/acsanm.8b02327