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a-Fe2O3/g-C3N4 Heterostructures: Preparation, Characterization and Gas-sensing Properties

Grant number: 18/18208-0
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): October 01, 2019
Effective date (End): September 27, 2024
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Elson Longo da Silva
Grantee:Ariadne Cristina Catto
Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID
Associated scholarship(s):21/12684-8 - Processing of graphene/Fe2O3 composites: characterization and development of highly performance gas sensors, BE.EP.PD


Nowadays, in order to control the presence of toxic gases in the urban areas, there is a need for sensitive and stable electronic sensors suited for detection from low ppb level to environmental monitoring and warfare agent detection. Among the materials for gas sensing, iron oxide (a-Fe2O3) and carbon nitride (g-C3N4) have revealed promising. However, the high operating temperatures (150 a 500oC) of these sensors make hindering their practical applications. Recent studies have shown that the junction between two semiconductors contributes significantly to the active site numbers available enhancing the gas sensing properties of such materials. Additionally, the formation of the heterojunction has also been shown to be beneficial for reduction of the working temperatures of the sensor materials. We propose herein the synthesis of the a-Fe2O3 and g-C3N4 nanostructures and the a-Fe2O3/g-C3N4 heterojunctions for investigation as resistive gas sensor. The heterostructures will be produced via sonochemical methods from the preformed compounds, and the a-Fe2O3, and g-C3N4 compounds will be synthesized via nonaqueous Sol-gel route, and thermal polymerization, enabling a controlled and reproductive preparation of these materials. DC electrical measurements will be performed under oxidizing and reducing gases (e.g. O3, NO2, NH3) for evaluation of the gas sensing performance. Furthermore, we also propose an investigation "in-situ and operando" by using AC impedance spectroscopy to understand the role of different regions of the device (bulk and interfaces) involved in the gas sensing mechanism of the synthesized samples.

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Scientific publications (8)
(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)
MIRABELLA, D. A.; DESIMONE, P. M.; PONCE, M. A.; ALDAO, C. M.; DA SILVA, L. F.; CATTO, A. C.; LONGO, E.. Effects of donor density on power-law response in tin dioxide gas sensors. SENSORS AND ACTUATORS B-CHEMICAL, v. 329, . (18/18208-0, 13/07296-2, 17/12437-5)
CATTO, ARIADNE C.; FERRER, MATEUS M.; LOPES, OSMANDO F.; MASTELARO, VALMOR R.; ANDRES, JUAN; DA SILVA, LUIS F.; LONGO, ELSON; AVANSI JR, WALDIR. The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate. Applied Surface Science, v. 529, . (18/18208-0, 17/12437-5, 13/13888-0, 13/07296-2, 12/15170-6)
GUELL, FRANK; GALDAMEZ-MARTINEZ, ANDRES; MARTINEZ-ALANIS, PAULINA R.; CATTO, ARIADNE C.; DA SILVA, LUIS F.; MASTELARO, VALMOR R.; SANTANA, GUILLERMO; DUTT, ATEET. ZnO-based nanomaterials approach for photocatalytic and sensing applications: recent progress and trends. MATERIALS ADVANCES, v. 4, n. 17, p. 24-pg., . (22/02927-3, 13/07296-2, 18/18208-0)
CATTO, ARIADNE C.; BERNARDINI, SANDRINE; AGUIR, KHALIFA; LONGO, ELSON; DA SILVA, LUIS F.. In-situ hydrothermal synthesis of oriented hematite nanorods for sub- ppm level detection of ozone gas. Journal of Alloys and Compounds, v. 947, p. 5-pg., . (21/12684-8, 22/02927-3, 18/18208-0, 13/07296-2)
SANTOS, EMERSON; CATTO, ARIADNE C.; PETERLINE, ALLAN F.; AVANSI JR, WALDIR. Transition metal (Nb and W) doped TiO2 nanostructures: The role of metal doping in their photocatalytic activity and ozone gas-sensing performance. Applied Surface Science, v. 579, . (17/18649-4, 18/18208-0, 17/12437-5, 13/17639-4, 13/07296-2)
DA SILVA, LUIS F.; CATTO, ARIADNE C.; BERNARDINI, SANDRINE; FIORIDO, TOMAS; DE PALMA, JOAO V. N.; AVANSI, JR., WALDIR; AGUIR, KHALIFA; BENDAHAN, MARC. BTEX gas sensor based on hematite microrhombuses. SENSORS AND ACTUATORS B-CHEMICAL, v. 326, . (18/18208-0, 13/07296-2, 17/12437-5)
CATTO, ARIADNE C.; OLIVEIRA, MARISA C.; RIBEIRO, RENAN A. P.; AVANSI JR, WALDIR; DA SILVA, LUIS F.; LONGO, ELSON. Hematite rhombuses for chemiresitive ozone sensors: Experimental and theoretical approaches. Applied Surface Science, v. 563, . (13/07296-2, 17/12437-5, 18/18208-0, 21/01651-1)
DA SILVA, GELSON T. S. T.; LOPES, OSMANDO F.; CATTO, ARIADNE C.; PATROCINIO, ANTONIO OTAVIO T.; MESQUITA, ALEXANDRE; RIBEIRO, CAUE; AVANSI JR, WALDIR; DA SILVA, LUIS F.. Long-and short-range structure of SnO2 nanoparticles: Synthesis and photo (electro)catalytic activity. Materials Chemistry and Physics, v. 305, p. 9-pg., . (21/12684-8, 22/10255-5, 22/02927-3, 18/18208-0, 13/07296-2)

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