α-Bi2O3 microcrystals and microrods: Thermal synthesis, structural and luminescence properties

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[1] Vila, M.
[2] Díaz-Guerra, C.
[3] Piqueras, J.
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Díaz-Guerra, C. (cdiazgue@fis.ucm.es) | 1600年 / Elsevier Ltd卷 / 548期
关键词：
α-Bi2O3 microcrystals and microrods with pyramidal tips have been grown by a vapour-solid method using pure Bi as starting material. The morphology of the obtained microstructures depends on the annealing temperature and time. At 650 °C and for short annealing times; microcrystals with well defined facets and sizes of tens of microns; as well as clusters of microcrystals; are formed. Microrods were grown at 800 °C; mainly from nucleation sites in the clusters of microcrystals; and reach lengths of hundreds of microns. Micro-Raman spectroscopy measurements reveal the homogeneity of the obtained microstructures regarding the crystalline α-phase. The luminescence properties of the microrods have been investigated by cathodoluminescence in the scanning electron microscope and by photoluminescence in a confocal microscope. The obtained results were correlated with X-ray photoelectron spectroscopy measurements. © 2012 Elsevier B.V. All rights reserved;
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