Ice-templated hybrid graphene oxide—graphene nanoplatelet lamellar architectures: tuning mechanical and electrical properties

Abstract The traditional freeze-casting route for processing graphene-based aerogels is generally restricted to aqueously dispersed flakes of graphene oxide (GO) and post-processing reduction treatments, which brings restrictions the electrical properties. In this work, we report a versatile aqueous that uses ability GO todisperse nanoplatelets (GNP) produce rGO-GNP lamellar via unidirectional freeze-casting. order optimise properties aerogel, GO-GNP dispersions were partially reduced by L-ascorbic acid prior tune carbon oxygen (C/O) ratio. then heat treated after casting fully reduce GO. chemical time was found control microstructure resulting aeorgels thus their mechanical An aerogel with density 20.8 ± 0.8 mg cm ?3 reducing using 60 min achieved an conductivity 42.3 S m ?1 . On other hand, optimal 35 led compressive modulus 0.51 ±0.06 MPa at 23.2 0.7 , revealing compromise between tuning We show present can also be easily applied on materials such as electrochemically exfoliated graphene.