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Thermal growth, structural and optical characterization of hierarchical Bi2O3 - MoO3 nanostructures

AuthorsVila, María; Díaz-Guerra, Carlos; Piqueras, Javier
KeywordsNanostructured materials
Oxide materials
Inelastic light scattering
Vapor deposition
Issue Date25-Dec-2017
CitationJournal of Alloys and Compounds 728: 827-835 (2017)
AbstractBranched α-BiO nanowires decorated with MoO nanoplates have been grown by a two–step sequential evaporation–deposition method. Their morphology, structural, compositional and luminescence properties were investigated by a set of spatially-resolved characterization techniques including scanning and high-resolution transmission electron microscopy (SEM, HRTEM), energy dispersive X-ray microanalysis (EDX), micro-Raman spectroscopy and cathodoluminescence (CL) in a SEM. Different zones can be distinguished in these complex structures. Close to the tips, the α-BiO nanowires appear covered by a high density of α–MoO nanoplates, as revealed by the SEM, HRTEM and micro-Raman observations. The BiO trunks of these hierarchical arrangements appear covered by a lower density of nanoplates, which decreases towards the base of the structures. Besides α–MoO, Raman measurements reveal the existence of crystals of other MoO phases, as well as different Mo oxides, in these zones. CL spectra from the different regions show emission bands related to oxygen vacancies and Bi intraionic transitions in α-BiO, while luminescence emission of the MoO nanoplates is mainly related to complex defects involving Mo ions and oxygen vacancies.
Publisher version (URL)https://doi.org/10.1016/j.jallcom.2017.09.048
Identifiersdoi: 10.1016/j.jallcom.2017.09.048
issn: 0925-8388
Appears in Collections:(ICMM) Artículos
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