Propriedades Ópticas de Nanofios de Óxido de Cério
Keywords:
Cerium Oxide, Nanowires, Optical PropertiesAbstract
This work presents the optical characterization of cerium oxide nanowires at the Optical, Electronic and Photonic Properties Research Group at Federal University of Paraná. Seven samples produced by the electrospinning technique were studied and underwent heat treatment whose calcination temperatures ranged from 350 °C to 950 °C. For the characterization of their optical properties, the techniques of photoluminescence spectroscopy (PL) and cathodoluminescence spectroscopy (CL) were used. The spectra obtained in the PL measurements reveal structures in the region of low wavelengths that can be attributed to the cerium oxide gap, in addition to the presence of large defect bands in the visible and infrared region of the spectrum. These bands are attributed to oxygen vacancies according to the literature, and their defect aspect was confirmed through PL measurements as a function of the 476 nm laser power. The spectra obtained by the CL measurements were displaced to regions of greater energy, due to the electron beam favoring the excitation of more energetic states linked to the CeO2 band structure, since both the beam energy and its quantum efficiency are greater than using light excitation. However, it was possible to observe a correlation between the two techniques, so that one is complementary to the other. After characterization, it was not possible to establish a clear correlation between the calcination temperature of the samples and variations in their optical properties.
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