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

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.