Conduction mechanisms in gas detectors based on nanostructured metalic oxide semiconductors

• Grant number: 16/50491-9
• Support type: Regular Research Grants
• Duration: October 01, 2017 - September 30, 2019
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Cooperation agreement: CONICET
• Principal Investigator: Elson Longo da Silva
• Grantee: Elson Longo da Silva
• Principal investigator abroad: Celso Manuel Aldao
• Institution abroad: Universidad Nacional de La Plata (UNPL), Argentina
• Home Institution: Faculdade de Engenharia (FEG). Universidade Estadual Paulista (UNESP). Campus de Guaratinguetá. Guaratinguetá , SP, Brazil
• Associated research grant: 13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID

Abstract

The general purpose of this project consists on the investigation of the conduction mechanisms in nanostructured semiconductor oxides based on pure and lanthanum (La) or europium (Eu) doped titanium or cerium dioxides. The determination of relationship in between micro structure of the sensor films, and its dependency with composition and processing route, along with the electrical properties for gas sensing will be evaluated. In this scope, efforts will be made on the synthesis of the nanostructures through the microwave assisted hydro-thermal route (MAH), on the deposition process via screen-printing technique, along with the sensing behavior of the devices against distinct atmospheres. For the characterizations, Positron annihilation spectroscopy (PAS), Complex Impedance spectroscopy (CIS), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared (FT-IR) spectroscopy, UV-Vis spectroscopy, X-rays diffraction (XRD), Scanning and Transmission electron microcopies (SEM, TEM) will be employed. Besides, the electrical conduction mechanisms will be modeled for a poly-crystalline semiconductor in order to elucidate the consequences of intergranular barriers exchanging properties owing to addition of dopants. (AU)