Assessment of the ozonolysis effect of rGO-ZnO-based ozone sensors

Autor(es)

Komorizono, Amanda Akemy ; de Lima, Bruno Sanches ; Mastelaro, Valmor Roberto

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 397, p. 9-pg., 2023-10-04.

Resumo

Gas sensors based on graphene nanocomposites have been widely investigated for the detection of different gases. However, few studies have reported graphene-based materials for ozone (O3) detection due to a permanent oxidation reaction between ozone and carbon atoms from graphene structure that leads to degradation of the material and poor sensing stability. Such an effect, called ozonolysis, is enhanced at higher temperatures. This article addresses the development of new techniques for the use of rGO-ZnO nanocomposites for ozone detection. A commercial rGO suspension was mixed with ZnO nanoparticles prepared by Pechini method. The study proposes two different production methods, according to which 1) ZnO nanoparticles are deposited over the surface of an rGO layer (labeled as rGO/ZnO) and 2) ZnO nanoparticles "sandwich" the rGO layer (labeled as ZnO/rGO/ ZnO). ZnO/rGO/ZnO samples showed no degradation when exposed to ozone and exhibited higher and more stable and efficient responses than rGO/ZnO. The results agree with surface and morphology characterizations through oS and SEM, suggesting the rGO layer should be covered by ZnO nanoparticles to be stable and efficient for ozone detection. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 18/07517-2 - Compósitos de grafeno e óxidos metálicos: aplicação como sensores de gases tóxicos
• Beneficiário: Bruno Sanches de Lima
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/22076-5 - Nanocompósitos a base de grafeno reduzido (rGO) e óxidos semicondutores metálicos (MOS) para aplicação como sensores de gases tóxicos
• Beneficiário: Valmor Roberto Mastelaro
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/22899-1 - Nanocompósitos a base de grafeno para aplicações como sensores de gás
• Beneficiário: Bruno Sanches de Lima
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado