Evolution of dielectric properties of thermally reduced graphene oxide as a function of pyrolisis temperature

Autor(es)

de Souza, Camila Brito ^[1] ; Nakagawa, Milena Arruda ^[1] ; Vargas, Ludmila Resende ^[1] ; Hilario, Rodrigo Barbosa ^[1] ; Dias Impere, Ana Gabriele ^{[2, 3]} ; Matsushima, Jorge Tadao ^{[4, 5]} ; Quirino, Sandro Fonseca ^{[6, 4]} ; Gama, Adriana Medeiros ^[2] ; Baldan, Mauricio Ribeiro ^{[1, 6]} ; Goncalves, Emerson Sarmento ^{[2, 1]}

Afiliação do(s) autor(es)

^[1] Inst Tecnol Aeronaut, Praca Marechal Eduardo Gomes, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Inst Aeronaut & Espaco, Lab Caracterizacao Fis Quim, Div Mat, Praca Marechal Eduardo Gomes, BR-12228904 Sao Jose Dos Campos, SP - Brazil

^[3] Univ Fed Sao Paulo, Av Cesare Mansueto Giulio Lattes 1211, BR-12231280 Sao Jose Dos Campos, SP - Brazil

^[4] ETEP Fac, Av Barao do Rio Branco 882, BR-12242800 Sao Jose Dos Campos, SP - Brazil

^[5] FATEC Sao Jose dos Campos, Ave Cesare Mansueto Giulio Lattes 1350, BR-12247014 Sao Jose Dos Campos, SP - Brazil

^[6] Inst Nacl Pesquisas Espaciais, Lab Associado Sensores, BR-12227010 Sao Jose Dos Campos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: DIAMOND AND RELATED MATERIALS; v. 93, p. 241-251, MAR 2019.
• Citações Web of Science: 1

Resumo

Reduced grapheneoxide (rGO) is a derivative of graphene and its properties allow several applications, such as supercapacitors, sensors, filters, among others. The rGO was obtained at 400 degrees C and 1000 degrees C. These materials were analysed using Scanning Electron Microscopy, Transmission Electron Microscopy, Thermogravimetric Analysis, Differential Exploratory Calorimetry, X-Ray Diffraction, Raman Scattering Spectroscopy, Fourier Transform Infrared Spectroscopy and Vector Network Analyzer. The sample treated at 400 degrees C resulted in a more exfoliated material, presenting six sheets in the interlayer, with well-distributed aromatic symmetry and more electroactive groups. Thus, it showed higher electric permittivity in agreement with Raman G symmetry results, implying an increase of C=C aromatic ring quantities, enabling this material to be used in electronic devices and nanocomposites with electromagnetic properties. This article aims to study the influence of structural and consequent changes in the dielectric properties of rGO samples as a function of pyrolysis temperature. (AU)

• Processo FAPESP: 16/11462-3 - Otimização e sistematização do processamento e obtenção de Polianilina(PAni)para aplicações em armazenadores de energia e filtros eletromagnéticos
• Beneficiário: Maurício Ribeiro Baldan
• Modalidade de apoio: Auxílio à Pesquisa - Regular