Gas sensors based on p-type metal semiconductor oxides: in-situ and operando advanced studies

• Grant number: 13/14647-6
• Support type: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): October 01, 2013
• Effective date (End): August 31, 2015
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal researcher: Elson Longo da Silva
• Grantee: Anderson André Felix
• Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated research grant: 13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID

Abstract

The main goal of this research project is to study the performance of p-type nanostructured semiconducting oxides as well to understand the main mechanisms for gas detection properties on these materials. Nanostructured semiconductor oxides will be obtained by microwave-assisted hydrothermal synthesis, aiming fine control of the morphology, size and crystalline phase, and, thereafter, will be characterized by X-ray diffraction, scanning electron microscopy and transmission and electrical measurements by impedance spectroscopy. The materials behavior as gas sensor will also be characterized on presence of oxidizing and reducing gases (e.g. NO2, CO, H2S) at low concentrations (range of ppm), and operating temperature in the range between 100 °C to 400 °C. The challenging and innovative part of this project is the use of electrical measurements and spectroscopic techniques, Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and X-ray Absorption Near-Edge Structure Spectroscopy (XANES), under similar sensor conditions aiming the in situ and operando monitoring of gas-solid interactions on the surface of nanostructures. The development of this project is expected to contribute significantly to scientific and technological development in the nanotechnology and gas sensors fields.

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)

FELIX, A. A.; SPREITZER, M.; VENGUST, D.; SUVOROV, D.; ORLANDI, M. O. Probing the effects of oxygen-related defects on the optical and luminescence properties in CaCu3Ti4O12 ceramics. Journal of the European Ceramic Society, v. 38, n. 15, p. 5002-5006, DEC 2018. Web of Science Citations: 1.

FELIX, ANDERSON A.; BEZZON, VINICIUS D. N.; ORLANDI, MARCELO O.; VENGUST, DAMJAN; SPREITZER, MATJAZ; LONGO, ELSON; SUVOROV, DANILO; VARELA, JOSE A. Role of oxygen on the phase stability and microstructure evolution of CaCu3Ti4O12 ceramics. Journal of the European Ceramic Society, v. 37, n. 1, p. 129-136, JAN 2017. Web of Science Citations: 20.

OLIVEIRA, L. H.; DE MOURA, A. P.; LA PORTA, F. A.; NOGUEIRA, I. C.; AGUIAR, E. C.; SEQUINEL, T.; ROSA, I. L. V.; LONGO, E.; VARELA, J. A. Influence of Cu-doping on the structural and optical properties of CaTiO3 powders. Materials Research Bulletin, v. 81, p. 1-9, SEP 2016. Web of Science Citations: 11.

FELIX, A. A.; LONGO, E.; VARELA, J. A.; ORLANDI, M. O. Gas sensing and conductivity relationship on nanoporous thin films: A CaCu3Ti4O12 case study. Thin Solid Films, v. 604, p. 69-73, APR 1 2016. Web of Science Citations: 5.

AMORESI, RAFAEL A. C.; FELIX, ANDERSON A.; BOTERO, ERITON R.; DOMINGUES, NELSON L. C.; FALCAO, EVARISTO A.; ZAGHETE, MARIA A.; RINALDI, ANDRELSON W. Crystallinity, morphology and high dielectric permittivity of NiO nanosheets filling Poly(vinylidene fluoride). CERAMICS INTERNATIONAL, v. 41, n. 10, B, p. 14733-14739, DEC 2015. Web of Science Citations: 13.

VOLANTI, D. P.; FELIX, A. A.; SUMAN, P. H.; LONGO, E.; VARELA, J. A.; ORLANDI, M. O. Monitoring a CuO gas sensor at work: an advanced in situ X-ray absorption spectroscopy study. Physical Chemistry Chemical Physics, v. 17, n. 28, p. 18761-18767, 2015. Web of Science Citations: 12.