Synthesis and Characterization of Sr1-xAxTi1-yByO3 (A = La, B = Fe, W)Nanostructured System : Application as Gas Sensor

• Grant number: 10/20582-6
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): April 01, 2011
• Effective date (End): December 31, 2014
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Valmor Roberto Mastelaro
• Grantee: Carlos Augusto Escanhoela Júnior
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Perovskite materials include a wide group of compounds whose structure in its simplest form can be represented by chemical formula ABO3. One major advantage that the perovskite structure shows is the high degree of flexibility in accommodating a wide variety of atoms in A and B sites, allowing greater control of chemical and physical properties of the material and maintaining its basic structure even at high concentrations dopants. Because of these properties, these materials have been successfully applied as capacitors, varistors, photoelectrodes, ferroelectric memories, gas sensors, etc.. Among the wide variety of materials present perovskite structure, strontium titanate (SrTiO3, ST) is one of the most materials known and studied. The possibility of creating defects in the structure of the ST compound by the insertion of dopants can lead to a significant modification of their physical properties. In this context, this thesis project aims at the synthesis and characterization of samples of composition Sr1-xAxTi1-yByO3 (A = La, B = Fe, W) in the form of thin films and thick to be applied as gas sensors . To determine the effect of doping on the properties of the material will be initially prepared samples in powder form through the polymeric precursor method and hydrothermal assisted by microwave method. Using these samples as a target, thick and thin films will be synthesized by the method of electron beam evaporation and sputerring. Optical and electrical measurements will be used to determine the effect of composition on physical properties of samples as well as its sensitivity to detect different types of gases.

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)

THIRUMALAIRAJAN, S.; MASTELARO, VALMOR R.; ESCANHOELA, JR., CARLOS A.. In-Depth Understanding of the Relation between CuAlO2 Particle Size and Morphology for Ozone Gas Sensor Detection at a Nanoscale Level. ACS APPLIED MATERIALS & INTERFACES, v. 6, n. 23, p. 21739-21749, DEC 20 2014. (10/20582-6, 13/19049-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

ESCANHOELA JÚNIOR, Carlos Augusto. Synthesis and characterization of nanostructured system Sr1-XLaxTi1-yFeyO3: application as gas sensor. 2015. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) São Carlos.