Preparation of Nd:YAG Nanopowder in a Confined Environment
- 28 February 2007
- journal article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 23 (7), 3947-3952
- https://doi.org/10.1021/la0625906
Abstract
Nanopowder of yttrium aluminum garnet (YAG, Y3Al5O12) doped with neodymium ions (Nd:YAG) was prepared in the water/cetyltrimethylammonium bromide/1-butanol/n-heptane system. Aluminum, yttrium, and neodymium nitrates were used as starting materials, and ammonia was used as a precipitating agent. Coprecipitate hydroxide precursors where thermally treated at 900 °C to achieve the garnet phase. The starting system with and without reactants was characterized by means of the small-angle neutron scattering technique. The system, without reactants, is constituted by a bicontinuous structure laying near the borderline with the lamellar phase region. The introduction of nitrates stabilizes the bicontinuous structure, while the presence of ammonia induces a transformation from the bicontinuous phase to a lamellar phase. Nd:YAG nanopowder was characterized by wide-angle X-ray scattering, transmission electron microscopy, gas adsorption, and photoluminescence spectroscopy. By comparison with a sample prepared by the conventional coprecipitation method, the obtained Nd:YAG nanopowder is constituted by smaller crystalline nanoparticles showing a lower tendency to agglomerate. In addition, the nanoparticles present a well-defined spherical shape. Photoluminescence spectroscopy confirms that the doping Nd3+ ions substitute Y3+ ions in the YAG crystalline lattice. The Nd3+ lifetime value, obtained from the luminescence decay curves, was 286 ± 10 μs, higher than the single-crystal value (255 μs) and much higher than the nanopowder value obtained by the conventional coprecipitation method (75 μs).Keywords
This publication has 52 references indexed in Scilit:
- A novel synthesis of phase-pure ultrafine YAG:Tb phosphor with different Tb concentrationMaterials Letters, 2003
- Synthesis of titania-coated silica nanoparticles using a nonionic water-in-oil microemulsionColloids and Surfaces A: Physicochemical and Engineering Aspects, 2001
- Small angle neutron scattering near Lifshitz lines: Transition from weakly structured mixtures to microemulsionsThe Journal of Chemical Physics, 1994
- Formation of alkoxy-derived yttrium aluminium oxidesJournal of Materials Science, 1992
- Formation of theoretical-density microhomogeneous YBa2Cu3O7-χ using a microemulsion-mediated processPhysica C: Superconductivity and its Applications, 1990
- Synthesis of cadmium sulfide in situ in reverse micelles. 2. Influence of the interface on the growth of the particlesThe Journal of Physical Chemistry, 1990
- Intercalibration of small-angle X-ray and neutron scattering dataJournal of Applied Crystallography, 1988
- Synthesis of yttrium aluminates by the sol-gel processJournal of Materials Science Letters, 1986
- Polydisperse systems. I. Scattering function for polydisperse fluids of hard or permeable spheresThe Journal of Chemical Physics, 1979
- Adsorption of Gases in Multimolecular LayersJournal of the American Chemical Society, 1938