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Preparation and Characterization of Graphene Oxide Aerogels: Exploring the Limits of Supercritical CO2 Fabrication Methods

AuthorsBorrás, Alejandro ; Gonçalves, Gil; Marbán, Gregorio; Sandoval, Stefania ; Pinto, Susana; Marques, Paula A. A. P.; Fraile, Julio ; Tobias, Gerard ; López Periago, Ana M. ; Domingo Pascual, M. Concepción
KeywordsGraphene oxide
Supercritical CO2
Mechanical integrity
Issue Date2-Oct-2018
CitationChemistry - a European Journal: 10.1002/chem.201803368 (2018)
AbstractThe supercritical carbon dioxide synthesis of non-reduced graphene oxide (GO) aerogels from dispersions of GO in ethanol is here reported as a low-cost, efficient and environmentally friendly process. The preparation is carried out at the mild conditions of 333 K and 20 MPa. The high aspect ratio of the used GO sheets (ca. 30 μm lateral dimensions) allowed the preparation of aerogel monoliths by simultaneous scCO2 gelation and drying. Solid state characterization results indicate that a thermally stable mesoporous non-reduced GO aerogel was obtained by using the supercritical procedure, keeping the GO sheets most of the surface oxygenated groups, thus, facilitating further functionalization. Moreover, the monoliths have a very low density, high specific surface area and excellent mechanical integrity, characteristics which rivals with that of most light-weight reduced graphene aerogels reported in the literature.
Publisher version (URL)http://dx.doi.org/10.1002/chem.201803368
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