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

Author(s)

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

• Document type: Journal article
• Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 397, p. 9-pg., 2023-10-04.

Abstract

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)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 18/07517-2 - Graphene and metal oxides composites: application as toxic gas sensors
• Grantee: Bruno Sanches de Lima
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/22076-5 - Reduced graphene (rGO) and metal semiconductor oxides (MOS) nanocomposites for application as toxic gas sensors
• Grantee: Valmor Roberto Mastelaro
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/22899-1 - Graphene-based nanocomposites for gas sensing applications
• Grantee: Bruno Sanches de Lima
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor