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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
Field of knowledge:Engineering - Materials and Metallurgical Engineering
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
Associated scholarship(s):19/09296-6 - Femtosecond laser irradiation in CeO2 samples and advances in theoretical approach, BE.EP.PD


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 midia outlets: (1 total)

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)
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: 0.
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: 2.

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