Few Layer Reduced Graphene Oxide: Evaluation of the Best Experimental Conditions for Easy Production

• Published in: Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2017-02, Vol.20 (1), p.53-61
• Main Authors: Pavoski, Giovani, Maraschin, Thuany, Fim, Fabiana de Carvalho, Balzaretti, Naira Maria, Galland, Griselda Barrera, Moura, Cássio Stein, Basso, Nara Regina de Souza
• Format: Article
• Language: English
• Subjects: Atmospheres; Defects; ENGINEERING, CHEMICAL; few layer graphene; Flakes (defects); grapheme; Graphene; Graphene oxide; Graphite; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; Oxidation; Oxides; Reduction
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/1980-5373-mr-2015-0528

This work aimed to produce graphene oxide with few graphene layers, a low number of defects, good conductivity and reasonable amount of oxygen, adequate for use as filler in polymeric composites. Two starting materials were evaluated: expanded graphite and graphite flakes. The method of oxidation used was the Staudenmaier one, which was tested over different lengths of time. No appreciable differences were found among the oxidation times and so the lowest oxidation time (24 h) was chosen as the most adequate. An investigation was also conducted into suitable temperatures for the reduction of graphite oxide. A temperature of 1000 [degrees]C gave the best results, allowing a good quality material with few defects to be obtained. The reduction was also evaluated under inert and normal atmosphere. The best results were obtained when the least modified material, e. g., graphite flakes, was used as a starting material, oxidized for 24h and reduced at 1000 [degrees]C for 30 s in a quartz ampoule under a normal atmosphere.