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

Autor(es)

Zito, Cecilia A. ^[1] ; Perfecto, Tarcisio M. ^[1] ; Volanti, Diogo P. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Lab Mat Sustainabil LabMatSus, Ibilce, R Cristovao Colombo 2265, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NEW JOURNAL OF CHEMISTRY; v. 42, n. 19, p. 15954-15961, OCT 7 2018.
• Citações Web of Science: 3

Resumo

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)

• Processo FAPESP: 17/01267-1 - Compósitos de ácido grafênico-óxidos metálicos ocos para sensor de gás
• Beneficiário: Diogo Paschoalini Volanti
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/13230-5 - Reforma parcial do etanol: estabilidade e seletividade de óxidos mistos anfóteros como catalisadores para reação em fluxo a baixa atmosférica
• Beneficiário: Mauricio Boscolo
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 16/25267-8 - Compósitos de ácido grafênico com estruturas de CeO2 ocas e Pd-CeO2 do tipo gema-casca aplicados como sensores de compostos orgânicos voláteis
• Beneficiário: Cecilia de Almeida Zito
• Modalidade de apoio: Bolsas no Brasil - Doutorado