Abstract
Branched α-Bi2O3 nanowires decorated with MoO3 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-Bi2O3 nanowires appear covered by a high density of α–MoO3 nanoplates, as revealed by the SEM, HRTEM and micro-Raman observations. The Bi2O3 trunks of these hierarchical arrangements appear covered by a lower density of nanoplates, which decreases towards the base of the structures. Besides α–MoO3, Raman measurements reveal the existence of crystals of other MoO3 phases, as well as different Mo oxides, in these zones. CL spectra from the different regions show emission bands related to oxygen vacancies and Bi3+ intraionic transitions in α-Bi2O3, while luminescence emission of the MoO3 nanoplates is mainly related to complex defects involving Mo5+ ions and oxygen vacancies.
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