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Carrera, Clara; González-Domı́nguez, José Miguel; Pascual, Francisco Javier; Ansón-Casaos, Alejandro; Benito, Ana M; Maser, Wolfgang K; García-Bordejé, Enrique
Journal of physical chemistry. C, 06/2020, Letnik: 124, Številka: 25Journal Article
Electrically conductive graphene aerogels are attracting great interest as functional materials. Nevertheless, graphene aerogels synthesized from graphene oxide usually exhibit low electrical conductivity. In order to increase conductivity, herein a postsynthesis thermal treatment at several temperatures (from 300 to 1000 °C) has been applied to pristine reduced graphene oxide aerogels under two different atmospheres, namely, inert Ar flow and isopropanol+H2 flow. Upon thermal treatment under Ar flow, the electrical conductivity of aerogel upscales with the treatment temperature. More remarkably, the electrical conductivity becomes 1 order of magnitude larger when the thermal treatment is carried out under isopropanol+H2 instead of under Ar, while maintaining a very low density and porous structure. The electrical conductivity achieved is exceptionally high for such a lightweight and porous material. The exhaustive characterization allowed disclosing that the generation of carbon links between the reduced graphene oxide nanosheets is the reason for this enhancement. The electrically conductive aerogels have excellent prospects for application as scaffolds for energy storage or biomedical applications.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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