Facile Graphene Oxide Preparation by Microwave-Assisted Acid Method
AUTOR(ES)
Viana, Marcelo M., Lima, Meiriane C. F. S., Forsythe, Jerimiah C., Gangoli, Varun S., Cho, Minjung, Cheng, Yinhong, Silva, Glaura G., Wong, Michael S., Caliman, Vinicius
FONTE
J. Braz. Chem. Soc.
DATA DE PUBLICAÇÃO
2015-05
RESUMO
Few-layered graphene oxide (GO) was prepared using a fast and energy-saving method by microwave-assisted acid technique. The oxygenated groups existing on the GO surface were determined using UV-Vis, X-ray photoelectron and Fourier-transform infrared spectroscopies. An oxygenated group percentage of 30% in mass for the GO was observed by thermogravimetric analysis. The reduced few-layered graphene oxide (rGO) film annealed at 110 °C deposited onto a silicon/silica wafer showed expanded graphite-like structure with 0.70 nm between the rGO sheets, as determined by X-ray diffraction. This rGO film exhibited a relatively high electrical conductivity value of 7.36 × 102 S m-1 confirming the good restoration of the π-conjugated system. The prepared GO sample exhibited good stability in water from pH 4 to 12, as determined by its zeta potential, and contained 5 to 9 layers, as determined by atomic force microscopy (AFM) and transmission electron microscopy (TEM).
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