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Comparison of the gas sensor response of devices with single and multiple tin oxide nanobelts.

Grant number: 15/21033-0
Support type:Scholarships in Brazil - Master
Effective date (Start): March 01, 2016
Effective date (End): May 23, 2018
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Marcelo Ornaghi Orlandi
Grantee:Mateus Gallucci Masteghin
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
Associated scholarship(s):17/12870-0 - Gas sensor response of devices made up by multiples and single tin dioxide-based nanobelts, BE.EP.MS


In this research project we propose to conduct a study in order to understand the mechanisms of transport and solid-gas interactions that occur on the surface of SnO, Sn3O4 and SnO2 nanostructures, prepared in different devices. In order to obtain a better understanding of the phenomena involved, we chose to study individually and collectively (single and multiples), the nanobelts of each of the three compositions, wherein the first method allows discard extraneous interference, by analyzing only the intrinsic conduction mechanisms in nanostructures. For this, the materials will be synthesized by the carbothermal reduction method and will later be characterized by XRD, TEM and FE-SEM to confirm the effectiveness of the synthesis, a fundamental part for obtaining reliable results. The materials are also characterized with respect to its gas sensor response in the presence of oxidizing and reducing gases (e.g., NO2, CO, H2) at low concentrations (in the range of ppm), at working temperatures between 100 and 350 °C, and to achieve such temperatures will be used the conventional method of heating and the self-heating method, promising by not require external source to perform heating, generating energy savings and facilitating greater mobility in detecting leaks. The main new features of this work is the individual characterization of SnO and Sn3O4 nanobelts as gas sensor, the study of sensor response of nanobelts with same chemical composition but with different diameters (nanoscale), and the choice of the self-heating method for the gas sensor measurements, in the study of SnO and Sn3O4 structures. To perform these studies, it will be built individual devices using interdigitated electrodes in a dual-beam equipment (Focused Ion Beam - FIB) able to perform electronic lithography. Thus, the main contribution of this work to the literature is the study of solid-gas interactions in thermodynamically unstable material (SnO and Sn3O4), the study the influence of the analyte gas in the thickness of the depression layer (indirectly, the sensor properties) and the use of a new gas sensing method (self-heating) for these materials. Finally, it is expected that all this study lead to the development of sensor materials with high sensitivity, selectivity, fast response time and miniaturization capability, which is important aiming any future practical applications from these materials.

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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)
MASTEGHIN, MATEUS G.; SILVA, RANILSON A.; COX, DAVID C.; GODOI, DENIS R. M.; SILVA, S. RAVI P.; ORLANDI, MARCELO O. The role of surface stoichiometry in NO2 gas sensing using single and multiple nanobelts of tin oxide. Physical Chemistry Chemical Physics, APR 2021. Web of Science Citations: 0.
MASTEGHIN, MATEUS G.; GODOI, DENIS R. M.; ORLANDI, MARCELO O. Heating Method Effect on SnO Micro-Disks as NO2 Gas Sensor. FRONTIERS IN MATERIALS, v. 6, JUL 16 2019. Web of Science Citations: 0.
MASTEGHIN, MATEUS G.; ORLANDI, MARCELO O. A Gas Sensor Based on a Single SnO Micro-Disk. SENSORS, v. 18, n. 10 OCT 2018. Web of Science Citations: 4.
MASTEGHIN, MATEUS G.; BERTINOTTI, RAFAEL C.; ORLANDI, MARCELO O. Coalescence growth mechanism of inserted tin dioxide belts in polycrystalline SnO2-based ceramics. MATERIALS CHARACTERIZATION, v. 142, p. 289-294, AUG 2018. Web of Science Citations: 1.
MASTEGHIN, MATEUS G.; BERTINOTTI, RAFAEL C.; ORLANDI, MARCELO O. High-performance and low-voltage SnO2-based varistors. CERAMICS INTERNATIONAL, v. 43, n. 16, p. 13759-13764, NOV 2017. Web of Science Citations: 7.
MASTEGHIN, MATEUS G.; VARELA, JOSE A.; ORLANDI, MARCELO O. Controlling the breakdown electric field in SnO2 based varistors by the insertion of SnO2 nanobelts. Journal of the European Ceramic Society, v. 37, n. 4, p. 1535-1540, APR 2017. Web of Science Citations: 6.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
MASTEGHIN, Mateus Gallucci. Comparação da resposta como sensor de gás de dispositivos com nanofita única e com múltiplas nanofitas de óxido de estanho. 2018. 170 f. Master's Dissertation - Universidade Estadual Paulista "Júlio de Mesquita Filho" Instituto de Química..

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