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Synthesis, Characterization and Evaluation of Electrical and photocatalitic Properties of nanocrystalline SrTiO3 compound Doped with Transition Metal Ions (Fe, Ni and Mn)

Grant number: 12/11246-8
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): September 01, 2012
Effective date (End): February 28, 2013
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Valmor Roberto Mastelaro
Grantee:Henrique Aparecido de Jesus Loures Mourão
Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:08/57872-1 - National Institute for Materials Science in Nanotechnology, AP.TEM


The process of doping has been widely used for the modification of physical and chemical properties of different materials and may lead to obtain new materials having new properties and applications. In nanocrystalline materials, the doping process has been also considered essential for stabilizing certain crystalline phases. The hydrothermal synthesis method has allowed the synthesis of materials on a scale ranging from nano to micron presenting different physical and chemical properties for the same materials obtained by other synthesis methods. Thus, the addition of doping process using a versatile synthesis methodology, shows to be a very interesting in order to understand the effect of doping on the physical properties of a particular material and to obtain a material having new properties. The objectives of this research project are the synthesis and characterization of the SrTiO3 compound pure and doped with Mn or Fe or Ni through the conventional and assisted by microwave hydrothermal method. It is expected through this projetc to be able to determine the effect of synthesis parameters (time and temperature), the introduction of dopants and the use of microwave or not the process of nucleation, growth and physical properties of these compounds. The verification of the effects by changing the synthesis parameters and the introduction of dopants in the structural and morphological properties of the materials will be achieved by the use of traditional characterization techniques such as X-ray diffraction, Raman spectroscopy and advanced characterization techniques as X-ray absorption spectroscopy , scanning and trasmission electron microscopy. It will also characterized their electrical properties in order to verify the sensitivity of these materials to different kinds gases and their evaluation concerning the photocatalytic degradation of organic dyes. These results will be correlated with the structural characteristics of the materials. It is expected that the end of work have improved the understanding of the effects of processing the hydrothermal method and the effect of doping on the properties of these compounds.

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Scientific publications
(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)
MOURAO, HENRIQUE A. J. L.; LOPES, OSMANDO F.; AVANSI, JR., WALDIR; PIRES, MANOEL J. M.; SOUZA, SOLANGE; RIBEIRO, CAUE; MASTELARO, VALMOR R.. SrTi1-yFeyO3 samples obtained by hydrothermal method: The effect of the amount of Fe on structural and photocatalytic properties. MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING, v. 68, p. 140-146, . (12/11246-8, 13/13888-0, 13/17639-4)

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