Morphology and Blue Photoluminescence Emission of PbMoO4 Processed in Conventional Hydrothermal
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2009-04-09
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Sczancoski, J. C. [UNESP]
Bomio, M. D. R. [UNESP]
Cavalcante, L. S.
Joya, M. R.
Pizani, P. S.
Varela, José Arana [UNESP]
Longo, Elson [UNESP]
Li, M. Siu
Andres, J. A.
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Amer Chemical Soc
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PbMoO4 micro-octahedrons were prepared by the coprecipitation method at room temperature without the presence of surfactants and processed in a conventional hydrothermal at different temperatures (from 60 to 120 degrees C) for 10 min. These micro-octahedrons were structurally characterized by X-ray diffraction (XRD) and micro-Raman (MR) spectroscopy, and its morphology was investigated by field-emission gun scanning electron microscopy (FEG-SEM). The optical properties were analyzed by ultraviolet-visible (UV-vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns and MR spectra confirmed that the PbMoO4 micro-octahedrons are characterized by a scheelite-type tetragonal structure. FEG-SEM micrographs points, out that these structures present a polydisperse particle size distribution in consequence of a predominant growth mechanism via aggregation of particles. In addition, it was observed that the hydrothermal conditions favored a spontaneous formation of micro-octahedrons interconnected along a common crystallographic orientation (oriented-attachment), resulting in self-organized structures. An intense blue PL emission at room temperature was observed in these micro-octahedrons when they were excited with a 350 nm wavelength. The origin of the PL emissions as well as its intensity variations are explained by means of a model based on both distorted [MoO4] and [PbO8] clusters into the lattice.
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Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 113, n. 14, p. 5812-5822, 2009.