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Synthesis and characterization of luminescent nanostructured semiconductor materials


The nanostructured materials have been extensively studied, not only because of the new properties and their possible technological applications, but also by the search for a better understanding of the physical and chemical processes that cause these changes. Compared to semiconductor materials, studies of the structure at the nanometer scale has received considerable interest due to the quantum size effect that these materials present. Nanocrystalline semiconductors have intermediate electronic properties between those of molecular structure and macrocrystalline solid, presenting a wide range of applications. However, there is no consensus in the literature about the nature of the photoluminescence emission in various nanocrystalline semiconductor materials. In this context, this project aims to perform the synthesis and characterization of nanostructured semiconductor materials and to correlate with photoluminescent properties. Chemical methods of preparation will be used in this project, such as hydrothermal method assisted by microwave and the polymeric precursor method. Morphological characterization will be performed through advanced techniques such as scanning electron microscopy, high-resolution (FEG-SEM) and BET to determine the surface area, particle size and curves of adsorption/desorption, pore size and distribution. Structural properties of nanoparticles, as well as their chemical and physical properties will be determined by conventional techniques such as X-ray diffraction, Raman spectroscopy and photoluminescence. The local structure of semiconductor materials will be evaluated by X-ray absorption techniques (XANES and EXAFS) to be held on Sincrotros Light National Laboratory (LNLS) facility. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RIBEIRO, GUILHERME K.; VICENTE, FABIO S.; BERNARDI, MARIA INES B.; MESQUITA, ALEXANDRE. Short-range structure and photoluminescent properties of the CaTiO3:Pr,La phosphor. Journal of Alloys and Compounds, v. 688, n. A, p. 497-503, . (13/12993-4, 13/07909-4)
GONZAGA, LUIZIANA APARECIDA; SANTANA, VINICIUS TADEU; BERNARDI, MARIA INES BASSO; HRUBY, JAKUB; NEUGEBAUER, PETR; MESQUITA, ALEXANDRE. CeO(2)and CeO2:Pr nanocrystalline powders prepared by the polymeric precursor method: Yellow and red pigments with tunable color. Journal of the American Ceramic Society, v. 103, n. 11, p. 6280-6288, . (13/12993-4)
ARAGON, F. F. H.; VILLEGAS-LELOVSKY, L.; CABRAL, L.; LIMA, M. P.; MESQUITA, A.; COAQUIRA, J. A. H.. Tuning the magnetic properties of Sn1-x-yCe4+xCe3+yO2 nanoparticles: an experimental and theoretical approach. NANOSCALE ADVANCES, v. 3, n. 5, p. 1484-1495, . (13/12993-4, 17/02317-2, 18/20729-9)
DE OLIVEIRA, RODRIGO CURY; MARTINS, DENIS EXPEDITO; BASSO BERNARDI, MARIA INES; MESQUITA, ALEXANDRE. Zn1-xMgxO nanoparticles prepared by the polymeric precursor method: Correlation between photoluminescence and local structure. Optical Materials, v. 86, p. 71-78, . (13/12993-4)
CURCIO, ANA LAURA; DA SILVA, LUIS FERNANDO; BASSO BERNARDI, MARIA INES; LONGO, ELSON; MESQUITA, ALEXANDRE. Nanostructured ZnS:Cu phosphor: Correlation between photoluminescence properties and local structure. Journal of Luminescence, v. 206, p. 292-297, . (17/12437-5, 13/12993-4, 13/07296-2)
DELTREGGIA, LUCAS ANGELINI; BASSO BERNARDI, MARIA INES; MESQUITA, ALEXANDRE. Influence of La substitution on local structural and photoluminescence properties of SrTiO3:Pr phosphor. SCRIPTA MATERIALIA, v. 157, p. 15-18, . (13/12993-4)

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