Hydrothermal synthesis and cathodoluminescence of ZnO crystalline powders and coatings

被引：24

作者：

Dem'yanets, LN ^{[1
]}

Li, LE ^{[1
]}

Uvarova, TG ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia

来源：

JOURNAL OF CRYSTAL GROWTH | 2006年 / 287卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

hydrothermal crystal growth; crystal morphology; nanomaterials;

D O I：

10.1016/j.jcrysgro.2005.10.036

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

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(NO3)(2)), solvents (LiOH, KOH, NH4OH) 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, NH4+ 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 lambda > 700 nm. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：23 / 27

页数：5

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