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Nanostructured Semiconductor Oxides: Nonaqueous Synthesis and their Gas Sensing Properties

Grant number: 15/20124-1
Support Opportunities:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): February 05, 2016
Effective date (End): May 29, 2016
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Elson Longo da Silva
Grantee:Luís Fernando da Silva
Supervisor: Markus Niederberger
Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Research place: Swiss Federal Institute of Technology Zurich, Switzerland  
Associated to the scholarship:13/09573-3 - Synthesis and Characterization of the ZnO/SnO2 Heterostructures obtained by Hydrothermal Method: Gas Sensor Applications, BP.PD


Gas detection is important for controlling industrial, and vehicle emissions, agricultural residues, and environmental control. In last decades, several semiconducting oxides have been used to detect dangerous or toxic gases. The excellent gas sensing performance of these gas sensor devices have observed at high temperatures (~250oC), which forbids the use for the detection of flammable and explosive gases. In this way, ultraviolet light activated gas sensors have been a simple and promising alternative to achieve room temperature sensitivity. Among the semiconductor oxides which exhibit a good performance as gas sensor, the zinc oxide (ZnO) and tin oxide (SnO2) have been highlighted. Nevertheless, their poor selectivity is the main disadvantage for application as gas sensor devices. Recently, heterostructures combining these two semiconductors (ZnO-SnO2) have been studied as an alternative way to enhance the gas sensor performance (sensitivity, selectivity, and stability). However, the controlled and reproductive synthesis of these nanostructured heterostructures has been the main challenge of the researchers. In this project, we proposed a four months internship for the synthesis of ZnO and SnO2 compounds and their ZnO-SnO2 heterostructures via nonaqueous sol-gel route. The samples will be characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Additionally, gas sensing measurements will be performed with and without UV-light radiation using oxidizing and reducing gases. This internship will count on the supervision of Professor Markus Niederberger, chair of the Laboratory of Multifunctional Materials of ETH Zürich.

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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)
COLMENARES, Y. N.; CORRER, W.; LIMA, B. S.; MASTELARO, V. R.. The effect of morphology on the ozone-gas sensing properties of zinc oxide sputtered films. Thin Solid Films, v. 703, . (12/15170-6, 13/07296-2, 15/20124-1, 13/09573-3)
DA SILVA, LUIS F.; M'PEKO, J. -C.; CATTO, ARIADNE C.; BERNARDINI, SANDRINE; MASTELARO, VALMOR R.; AGUIR, KHALIFA; RIBEIRO, CAUE; LONGO, ELSON. UV-enhanced ozone gas sensing response of ZnO-SnO2 heterojunctions at room temperature. SENSORS AND ACTUATORS B-CHEMICAL, v. 240, p. 573-579, . (12/15170-6, 13/07296-2, 15/20124-1, 13/09573-3)

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