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α-Bi_2O_3 microcrystals and microrods: thermal synthesis, structural and luminescence properties

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Piqueras de Noriega, Javier and Díaz-Guerra Viejo, Carlos and Vila Santos, María (2013) α-Bi_2O_3 microcrystals and microrods: thermal synthesis, structural and luminescence properties. Journal of Alloys and Compounds, 548 . pp. 188-193. ISSN 0925-8388

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2012.08.133


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Abstract

α-Bi_2O-3 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.


Item Type:Article
Additional Information:

© 2012 Elsevier B.V.
This work has been supported by MICINN through projects MAT2009-07882 and CSD2009-0013. The authors are grateful to
E. Magnano, S. Nappini and M. Yablonskikh at the Sincrotron Trieste for useful advices on XPS measurements.

Uncontrolled Keywords:Bismuth Oxide, Optical-Properties, Thin-Films, Bi_2O_3, Spectra, Surface, Bismuthsesquioxide, Evaporation, Nanowires, Ceramics
Subjects:Sciences > Physics > Materials
ID Code:23623
Deposited On:21 Nov 2013 09:54
Last Modified:12 May 2016 15:29

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