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Master's Dissertation
DOI
https://doi.org/10.11606/D.85.2018.tde-17052018-083054
Document
Author
Full name
Quezia de Aguiar Cardoso Ribeiro
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Júnior, Rubens Nunes de Faria (President)
Campos, Marcos Flávio de
Casini, Julio César Serafim
Title in Portuguese
Estudo do processo de redução térmica em vácuo do óxido de grafeno visando à obtenção de matéria-prima para supercapacitor
Keywords in Portuguese
grafeno
redução do óxido de grafeno
supercapacitores
Abstract in Portuguese
Neste estudo foi investigado o processo de redução térmica do óxido de grafeno em médio vácuo como uma rota viável de baixo custo econômico para obtenção do óxido de grafeno reduzido para aplicação em supercapacitores. O objetivo principal foi estudar a influência da temperatura de processamento no grau de redução do óxido de grafeno utilizando um sistema de vácuo com bomba mecânica de duplo estágio. O processamento constituiu na exposição do óxido de grafeno em várias temperaturas (200, 400, 600, 800 e 1000 °C) com pressão reduzida (10-2mbar) condição de médio vácuo. Foram utilizadas técnicas convencionais para caracterização dos materiais precursores e processados, tais como: microscopia eletrônica de varredura (MEV), difração de raios-X (DRX) e espectroscopia no infravermelho com transformada de Fourier (FTIR). Com os resultados deste estudo foi demostrado que é possível obter o óxido de grafeno reduzido utilizando um sistema de vácuo com bomba mecânica de duplo estágio e temperaturas de processamento superiores a 200°C.
Title in English
Study of the process of thermal reduction in vacuum of the graphene oxide for obtaining starting material for supercapacitor
Keywords in English
graphene
reduction of graphene oxide
supercapacitors
Abstract in English
In this study the process of medium vacuum thermal reduction of the graphene oxide as a low cost route for obtaining reduced graphene oxide has been investigated. The main objective was to study the influence of the processing temperature on the degree of reduction of the graphene oxide using a vacuum system with two stage backing pump. The processing was carried out by exposing the graphene oxide at various temperatures (200, 400, 600, 800 e 1000 °C) with reduced pressure (10-2 mbar). Conventional techniques have been employed to the characterization of the starting and processed materials, such as: scanning electron microscopy (SEM), X-ray diffraction and Fourier transformed infrared spectroscopy (FTIR). With the results of this study it has been demonstrated that it is possible to obtain the reduced graphene oxide using a vacuum system with a two stage backing pump and processing temperatures superior to 200°C.
 
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2017CardosoEstudo.pdf (2.99 Mbytes)
Publishing Date
2018-05-17
 
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