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Chemical sensor characterization of pure and hybrid nanostructured materials based on tin oxide

Grant number: 13/18511-1
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): February 01, 2014
Effective date (End): January 31, 2015
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Marcelo Ornaghi Orlandi
Grantee:Pedro Henrique Suman
Supervisor: Harry L. Tuller
Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Research place: Massachusetts Institute of Technology (MIT), United States  
Associated to the scholarship:12/11139-7 - Gas sensors based on SnO2-CuO: advanced studies in situ and operando, BP.DR


In this research project the study the gas sensing properties of pure and hybrid one-dimensional tin oxide nanostructures synthesized by microwave-assisted solvothermal method is proposed. For this study, pure (SnO2) and surface-modified nanostructures with semiconducting oxide (SnO2-CuO), metal catalyst (SnO2-Pt) and mixed (SnO2-CuO-Pt) will be used. The gas sensor performance of these nanostructures will be analyzed simultaneously and under identical experimental conditions in the presence of oxidizing (e.g. NO2, O2) and reducing gases (e.g. H2, CO, CH4) at low concentrations (in the ppm range) and at operating temperatures between 100 to 400 °C. Furthermore, thermopower measurements will be also performed to determine the conductivity type (majority charge carriers) in each semiconducting nanostructure. The key challenge of this work is to develop improved models for the mechanisms describing the gas-solid interactions that occur on the different surfaces of nanostructures. These interactions are known to be responsible for their gas sensors properties. The focus of this work will be to achieve an improved understanding of the relationship between the sensor response and the unique combination of surface nanostructures imposed on the SnO2 host material, which if successful, could enable the development of new faster, more sensitive and selective gas sensor devices with potential in future technological applications. (AU)

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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)
BARBOSA, MARTIN S.; SUMAN, PEDRO H.; KIM, JAE J.; TULLER, HARRY L.; VARELA, JOSE A.; ORLANDI, MARCELO O.. Gas sensor properties of Ag- and Pd-decorated SnO micro-disks to NO2, H-2 and CO: Catalyst enhanced sensor response and selectivity. SENSORS AND ACTUATORS B-CHEMICAL, v. 239, p. 253-261, . (13/18511-1, 12/51195-3, 13/08734-3, 14/50725-4)
BARBOSA, MARTIN S.; SUMAN, PEDRO H.; KIM, JAE J.; TULLER, HARRY L.; ORLANDI, MARCELO O.. Investigation of electronic and chemical sensitization effects promoted by Pt and Pd nanoparticles on single-crystalline SnO nanobelt-based gas sensors. SENSORS AND ACTUATORS B-CHEMICAL, v. 301, . (13/18511-1, 12/51195-3, 13/08734-3, 14/50725-4)

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