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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Porous CeO2 nanospheres for a room temperature triethylamine sensor under high humidity conditions

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Zito, Cecilia A. [1] ; Perfecto, Tarcisio M. [1] ; Volanti, Diogo P. [1]
Total Authors: 3
[1] Sao Paulo State Univ Unesp, Lab Mat Sustainabil LabMatSus, Ibilce, R Cristovao Colombo 2265, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: NEW JOURNAL OF CHEMISTRY; v. 42, n. 19, p. 15954-15961, OCT 7 2018.
Web of Science Citations: 3

The development of highly sensitive and selective gas sensors is essential for the detection of harmful compounds. However, the gas-sensing performance presents some challenging issues such as the requirement of high operating temperatures and the negative impact of humidity. Herein, we have prepared porous CeO2 nanospheres (NS) using a simple microwave-assisted solvothermal method, followed by calcination, and demonstrated the triethylamine (TEA) sensing performance of the NS at room temperature and a relative humidity of 98%. The sensor showed enhanced sensing properties towards TEA compared to other volatile organic compounds. Significantly, the CeO2 NS exhibited a response of 4.67 to 100 ppm of TEA with a fast response time of 13 s. Furthermore, the sensor was able to detect low TEA concentrations (5 ppm) and presented excellent repeatability. The outstanding sensing properties are attributed to the high specific surface area, the porous structure of CeO2 NS (which allows a great gas diffusion), and the increased number of active sites for TEA oxidation due to the formation of hydroxyl groups on the CeO2 surface from high humidity conditions. Thus, the use of CeO2 NS is a promising approach by which to fabricate TEA sensors that operate at room temperature and high humidity levels. (AU)

FAPESP's process: 16/25267-8 - Graphene acid composites with hollow CeO2 and Pd-CeO2 yolk-shell structures applied as volatile organic compounds sensors
Grantee:Cecilia de Almeida Zito
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 17/01267-1 - Graphene acid-hollow metal oxides composites for gas sensor
Grantee:Diogo Paschoalini Volanti
Support type: Regular Research Grants
FAPESP's process: 17/13230-5 - Partial ethanol reforming: stability and selectivity of mix metal amphoteric oxides as catalysts for atmospheric pressure flow reaction
Grantee:Mauricio Boscolo
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants