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Gas sensor response of devices made up by multiples and single tin dioxide-based nanobelts

Grant number: 17/12870-0
Support type:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): August 07, 2017
Effective date (End): October 28, 2017
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Marcelo Ornaghi Orlandi
Grantee:Mateus Gallucci Masteghin
Supervisor abroad: Ravi Silva
Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Research place: University of Surrey, England  
Associated to the scholarship:15/21033-0 - Comparison of the gas sensor response of devices with single and multiple tin oxide nanobelts, BP.MS


The main motivation for this project is to explore the gas sensor response and transport mechanism of tin oxide-based nanostructures through the solid-gas interactions study on individuals SnO, Sn3O4 and SnO¬2 nanobelts, with different diameters, against oxidizing and reducing gases. SnO2-based sensors are already well established in the literature, but thermodynamically less stable oxides (SnO and Sn3O4) lack additional studies to explain their changes in electrical conductivity. Study devices in the form of individual nanostructures eliminates the contribution of potential barriers in the grain boundaries formed as a result of contacting one structure with another, thus, the conduction mechanism is free of extrinsic factors, and can be explained only on the basis of the interactions between the molecular orbitals and the band bending resulting from the charger transfer and creation of an electric field. However, to study isolated materials, contacts on this scale must be carefully prepared and a non-ohmic metal/semiconductor junction must be avoided and, especially, in the case of microfabrication using the dual beam microscope, the contamination with Ga+3 or C/Platinum composite should be minimized. Thus, through this partnership with Prof. Ravi Silva group at the University of Surrey, one seeks the platinum deposition using photo-lithography on specially designed electrodes that allows measuring 2-probe and 4-probe IxV measurements in the same device, in addition to the circuit for self-heating, which together with the use of single nanobelts allows the device to consume only about 10-8W, ideal for use in mobile devices due to its compact size and low power consumption. Besides, Dr. David Cox will be accompanying the candidate in the use of the Dual Beam, improving student skills.The project is intended to be carried out under supervision of both Prof. Marcelo Orlandi and Prof. Ravi Silva. Part of the activities of the master degree project - synthesis; DRX and electron microscopy characterizations; and comparison of the multiple structures (carpet mode) gas sensor response under the self-heating and external-heating modes - was/is taking place in Brazil - and part will be carried out at University of Surrey - devices fabrication (using the photo-lithograph technique) and FIB improvements -, to synergistically combine the expertise and infrastructure of the two groups, thus opening the possibility to achieve transformative results. After the return of the candidate, the gas sensor measurements of the devices fabricated in the UK will be carried out in the LIEC lab (Araraquara-SP/Brazil).

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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)
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, . (13/07296-2, 15/21033-0, 17/12870-0, 17/26219-0)
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, . (17/26219-0, 15/21033-0, 17/12870-0, 13/07296-2)

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