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An experimental theoretical approach of conduction mechanisms and interface defects of heterostructures sensors based on p-n and n-n semiconductors from CeO2 matrices

Grant number: 17/19143-7
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): April 01, 2018
Effective date (End): March 31, 2021
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Alexandre Zirpoli Simões
Grantee:Rafael Aparecido Ciola Amoresi
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


The purpose of this project is to study electrical and sensor properties based on CeO2 matrices in a heterostructured form with p-n (CeO2/NiO) and n-n (CeO2/WO3) junctions. New advances are expected compared to the patent developed by our group (BR10201602838 - Brasil) for this matrix, which present a dual response (electro-optical and electrical). In this work, two preferred morphologies for the CeO2 matrix will be evaluated and then the heterostructures will be coupled and studied. The main objective is to obtain a substantially understanding improvement in the quality between the surface of the heterojunctions and the sensor behavior compared to previous research employing the microwave-assisted solvothermic method. Specifically, the adsorption mechanisms resulting from the different interfaces (p-n and n-n) and morphologies in relation to clusters, surface defects, and conduction mechanisms will be evaluated. The devices will be characterized using the most modern techniques at the atomic, structural, morphological and electrical levels such as XPS, XANES, Impedance Spectroscopy, among others. The performance of the sensors will be evaluated in atmospheres of oxidizing and reducing gases in sensor chamber developed and patented by the group (PI20150103953 - Argentina). The challenge of this work will be to construct heterostructures with a designer that allows to study simultaneously the relation of energy and surface defects with the type of junction, factors that in the literature, are still not explored, and has direct relation with sensitivity, shorter response time and working temperature of the sensor device. In this sense experimental results will be correlated to theoretical studies and will enable a deep understanding between structure and property. (AU)

Articles published in other media outlets (2 total):
Jornal Joseense News: Conferência na Universidade da Califórnia tem representante do CDMF (25/Sep/2019)
Central das Notícias: Conferência na Universidade da Califórnia tem representante do CDMF (25/Sep/2019)

Scientific publications (7)
(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)
DE OLIVEIRA, REGIANE CRISTINA; CIOLA AMORESI, RAFAEL APARECIDO; MARANA, NAIARA LETICIA; ZAGHETE, MARIA APARECIDA; PONCE, MIGUEL; CHIQUITO, ADENILSON JOSE; SAMBRANO, JULIO RICARDO; LONGO, ELSON; SIMOES, ALEXANDRE ZIRPOLI. Influence of Synthesis Time on the Morphology and Properties of CeO2 Nanoparticles: An Experimental-Theoretical Study. Crystal Growth & Design, v. 20, n. 8, p. 5031-5042, AUG 5 2020. Web of Science Citations: 0.
ROCHA, LEANDRO S. R.; AMORESI, RAFAEL A. C.; MORENO, HENRIQUE; RAMIREZ, MIGUEL A.; PONCE, MIGUEL A.; FOSCHINI, CESAR R.; LONGO, ELSON; SIMOES, ALEXANDRE Z. Novel Approaches of Nanoceria with Magnetic, Photoluminescent, and Gas-Sensing Properties. ACS OMEGA, v. 5, n. 25, p. 14879-14889, JUN 30 2020. Web of Science Citations: 0.
ROCHA, LEANDRO SILVA ROSA; CIOLA AMORESI, RAFAEL APARECIDO; DUARTE, THIAGO MARINHO; MARANA, NAIARA LETICIA; SAMBRANO, JULIO RICARDO; ALDAO, CELSO MANUEL; SIMOES, ALEXANDRE ZIRPOLI; PONCE, MIGUEL ADOLFO; LONGO, ELSON. Experimental and theoretical interpretation of the order/disorder clusters in CeO2:La. Applied Surface Science, v. 510, APR 30 2020. Web of Science Citations: 0.
ROCHA, LEANDRO S. R.; SCHIPANI, FEDERICO; ALDAO, CELSO M.; CABRAL, LUIS; SIMOES, ALEXANDRE Z.; MACCHI, CARLOS; MARQUES, GILMAR E.; PONCE, MIGUEL A.; LONGO, ELSON. Experimental and ab Initio Studies of Deep-Bulk Traps in Doped Rare-Earth Oxide Thick Films. Journal of Physical Chemistry C, v. 124, n. 1, p. 997-1007, JAN 9 2020. Web of Science Citations: 0.
AMORESI, RAFAEL A. C.; OLIVEIRA, REGIANE C.; MARANA, NAIARA L.; DE ALMEIDA, PRISCILA B.; PRATA, PALOMA S.; ZAGHETE, MARIA A.; LONGO, ELSON; SAMBRANO, JULIO R.; SIMOES, ALEXANDRE Z. CeO2 Nanoparticle Morphologies and Their Corresponding Crystalline Planes for the Photocatalytic Degradation of Organic Pollutants. ACS APPLIED NANO MATERIALS, v. 2, n. 10, p. 6513-6526, OCT 2019. Web of Science Citations: 0.
COLETO JUNIOR, UBIRAJARA; AMORESI, RAFAEL A. C.; PEREIRA, CHRYSTOPHER A. M.; SIMOES, ALEXANDRE Z.; ZAGHETE, MARIA A.; MONTEIRO FILHO, ELIAS S.; LONGO, ELSON; PERAZOLLI, LEINIG A. Influence of defects on photoluminescent and photocatalytic behavior of CaO/SrTiO3 heterojunctions. CERAMICS INTERNATIONAL, v. 45, n. 12, p. 15244-15251, AUG 15 2019. Web of Science Citations: 2.
COLETO, JR., UBIRAJARA; AMORESI, RAFAEL A. C.; TEODORO, VINICIUS; IANI, ISABELA M.; LONGO, ELSON; ZAGHETE, MARIA A.; PERAZOLLI, LEINIG A. An approach for photodegradation mechanism at TiO2/SrTiO3 interface. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, v. 29, n. 23, p. 20329-20338, DEC 2018. Web of Science Citations: 3.

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