Thermal effusion of water and carbon oxides from multilayered graphene oxide thin films

Autor(es)

da Silva, Douglas S. ; Viana, Gustavo A. ; Merlo, Rafael B. ; da Silva Filho, Jose M. C. ; Barros, Tarcio A. S. ; Marques, Francisco C.

• Tipo de documento: Artigo Científico
• Fonte: RS ADVANCE; v. 9, n. 9, p. 6-pg., 2024-01-25.

Resumo

We report on water (H2O) and carbon oxides (CO and CO2) effusion from multilayered graphene oxide (GO) films during thermal reduction. The effusion of molecules was monitored through the thermal desorption spectroscopy (TDS) technique in films prepared by evaporating a colloidal solution of GO. This method reduces the presence of adsorbed/trapped H2O molecules between adjacent GO planes. That allows the observation of additional effusion mechanisms. Thermal reduction process, from room temperature to similar to 1000 degrees C, was performed in a high-vacuum system with a mass spectrometer to monitor the outgassed species. A collective outgassing of H2O, CO2, CO species is observed and centered at approximately 230 degrees C. Above 400 degrees C, CO2 and CO are the only observed outgassed species. Multiple origins for water outgassing were inferred from the TDS spectrum asymmetry, revealing an intricate superposition of mechanisms. The thermal treatment also reduces both the GO interlayer separation and the film surface roughness. (AU)

• Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia