Tailored Network Formation in Graphene Oxide Gels.
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Graphene oxide (GO)-based gels are attractive because of their ability to retain individual nanosheet properties in a three-dimensional (3D) bulk material. The final morphology and properties of these 3D gel networks depend strongly on the type and density of cross-links, and these gels can be dried and annealed to form aerogels with both high conductivity (560 S/m) and high surface area (1700 m2/g). The results show that both ammonia content and the parent nanosheet morphology (crumpled vs flat) have a strong influence on the cross-linked structure and composition; notably, nitrogen is found in the gels, suggesting that ammonia actively participates in the reaction rather than as a mere catalyst. The GO nanosheet morphology may be altered using spray-drying to obtain crumpled GO (cGO) nanosheets and form cGO gels; this allows for an additional handle in the creation of GO-based gels with tunable density, electrical conductivity, and surface area.
author list (cited authors)
Parviz, D., Shah, S. A., Odom, M., Sun, W., Lutkenhaus, J. L., & Green, M. J.
complete list of authors
Parviz, Dorsa||Shah, Smit A||Odom, Morgan GB||Sun, Wanmei||Lutkenhaus, Jodie L||Green, Micah J