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High porosity scaffold composites of graphene and carbon nanotubes as microwave absorbing materials

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dc.affiliation.dptoUC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Químicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Polímeros y Compositeses
dc.contributor.authorGonzález Sánchez, Marta
dc.contributor.authorBaselga Llidó, Juan
dc.contributor.authorPozuelo de Diego, Javier
dc.date.accessioned2016-11-18T10:02:32Z
dc.date.available2017-08-16T22:00:07Z
dc.date.issued2016-08-07
dc.description.abstractThe design of microwave absorbing materials requires low reflection and high absorption of radiation simultaneously. Low reflection of electromagnetic waves can be achieved inducing porous faces which minimize the impedance mismatch. High absorption can be obtained by increasing the conductivity of the material. We report the preparation of highly porous scaffolds from a combination of graphene and carbon nanotubes. The bimodal porous structure was controlled making use of the surface properties of graphene oxide that are able to stabilize hexane droplets in aqueous dispersions of graphene oxide and carbon nanotubes. After hydrothermal and two step freeze-drying processes, macro-(220 microns) and mesoporous (10 microns) structures, due to hexane droplets and freeze drying, respectively, were obtained. DC conductivities of 8.2, 14.7, 33.2, and 60.7 S m(-1) were obtained for graphene scaffolds containing 0, 10, 20 and 40% of carbon nanotubes respectively. An electromagnetic characterization was performed on scaffolds infiltrated with epoxy resin; using appropriate models, the electromagnetic properties of the conducting phase have been obtained. Scaffolds with a thickness of 9 mm were able to absorb up to 80% of the incident radiation keeping the reflection as low as 20%.en
dc.description.sponsorshipThis work was supported by grant NANONARQ (MAT2014-57557-R) from the Spanish Ministerio de Economía y Competitividad.en
dc.format.extent9
dc.format.mimetypeapplication/pdf
dc.identifier.bibliographicCitationJournal of Materials Chemistry C, Issue 36, pp. 8575-8582
dc.identifier.doihttps://doi.org/10.1039/C6TC01984F
dc.identifier.issn2050-7526
dc.identifier.publicationfirstpage8575
dc.identifier.publicationissue36
dc.identifier.publicationlastpage8582
dc.identifier.publicationtitleJournal of materials chemistry C
dc.identifier.urihttps://hdl.handle.net/10016/23907
dc.identifier.uxxiAR/0000018055
dc.language.isoengen
dc.relation.projectIDGobierno de España. MAT2014-57557-Res
dc.rights© 2016 Royal Society of Chemistry
dc.rights.accessRightsopen access
dc.subject.ecienciaMaterialeses
dc.titleHigh porosity scaffold composites of graphene and carbon nanotubes as microwave absorbing materials
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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