Hydrothermal synthesis and cathodoluminescence of ZnO crystalline powders and coatings

Hydrothermal synthesis and cathodoluminescence of ZnO crystalline powders and coatings

Nanocrystalline ZnO powders and coatings of ZnO were obtained under soft hydrothermal conditions. The growth systems contained various ZnO-precursors (as-prepared Zn-hydroxide, chemical ZnO, Zn(NO 3) 2), solvents (LiOH, KOH, NH 4OH) and Zn-substrate. ZnO growth morphology was found to depend on the...

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Veröffentlicht in:Journal of crystal growth 2006-01, Vol.287 (1), p.23-27
Hauptverfasser: Dem’yanets, L.N., Li, L.E., Uvarova, T.G.
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Sprache:eng
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A1. Hydrothermal crystal growth
A2. Crystal morphology
B1. Nanomaterials
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container_title Journal of crystal growth
container_volume 287
creator Dem’yanets, L.N.
Li, L.E.
Uvarova, T.G.
description Nanocrystalline ZnO powders and coatings of ZnO were obtained under soft hydrothermal conditions. The growth systems contained various ZnO-precursors (as-prepared Zn-hydroxide, chemical ZnO, Zn(NO 3) 2), solvents (LiOH, KOH, NH 4OH) and Zn-substrate. ZnO growth morphology was found to depend on the chemical composition of the solvent: Li + suppresses the growth of (0 0 0 1) faces, NH 4 + promotes it. Aspect ratio of crystals is controlled by solvent type and concentration. Luminescent properties have been studied using impulse laser or cathode excitation. The ratio I UV/ I VIS in luminescence spectra was found to depend on the excitation mode. Laser excitation allows to obtain UV-band with higher intensity in comparison with cathode excitation. The most intensive UV luminescence was found for polycrystalline coatings on Zn-substrates obtained in the systems with KOH as a solvent. Mathematic treatment of the ICL spectra was carried out; the wide VIS-band was found to consist of the series of overlapping bands. UV luminescence quenching centers were suggested to be connected mainly with the irradiation in VIS-region with c λ > 700 nm .
doi_str_mv 10.1016/j.jcrysgro.2005.10.036
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subjects A1. Hydrothermal crystal growth
A2. Crystal morphology
B1. Nanomaterials
title Hydrothermal synthesis and cathodoluminescence of ZnO crystalline powders and coatings
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