Investigating the role of microwave thermal and non-thermal effects on WO₃-graphene oxide composite synthesis

Autor(es)

Rodrigues, Barbara S. ; Vicente, Marcos R. S. ; Souza, Juliana S.

• Tipo de documento: Artigo Científico
• Fonte: RSC ADVANCES; v. 13, n. 38, p. 10-pg., 2023-09-04.

Resumo

The effects of microwave-assisted synthesis on the morphology and crystalline structure of WO3-graphene oxide (GO) composites have been investigated. Using two different microwave reactors, evidence supports that thermal and non-thermal effects significantly influence the properties of the synthesized materials. The findings reveal that the microwave cavity geometry affects how the microwaves are "delivered" to the reactional cavity as a function of time; it also orientates the growth process of the WO3 particles. Consequently, the crystalline structure and morphology are affected. As a result, the WO3-GO composites produced using a CEM reactor exhibit a rounded shape and hexagonal phase of WO3, besides enhanced reduction of GO. Whereas the composites made using an Anton-Paar reactor are composed of sheets and flowers of WO3 with hexagonal, triclinic and/or WO3 hydrate structures and cause a lower reduction on the GO. (AU)

• Processo FAPESP: 21/05958-4 - Modulação de propriedades físico-químicas de semicondutores metálicos através do controle dos parâmetros de síntese assistida por micro-ondas
• Beneficiário: Juliana dos Santos de Souza Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/26010-9 - Dispositivos fotoativos baseados em heterojunções de vanadato de bismuto e óxido de tungstênio sobre grafeno
• Beneficiário: Bárbara Scola Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto