Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/19811
Title: Clay-Graphene Nanoplatelets Functional Conducting Composites
Author: Ruiz-Hitzky, Eduardo
Sobral, Maria Madalena C.
Gomez-Aviles, Almudena
Nunes, Claudia
Ruiz-Garcia, Cristina
Ferreira, Paula
Aranda, Pilar
Keywords: MAYA BLUE
TEMPLATED SYNTHESIS
SUPPORTED GRAPHENE
PORE STRUCTURE
POLYMER-CLAY
NANOCOMPOSITES
SEPIOLITE
GRAPHITE
OXIDE
BIONANOCOMPOSITES
Issue Date: 2016
Publisher: WILEY-V C H VERLAG GMBH
Abstract: An approach to functionalize graphene-based materials has been developed by assembling graphene nanoplatelets (GNP) with clay minerals. Under convenient sonomechanical treatment, clay-GNP mixtures may produce very stable water dispersions in particular using sepiolite fibrous clay. While in the absence of clay a rapid decantation of GNP in water is observed, in the presence of sepiolite the resulting dispersions remain stable during months without syneresis effects. Rigid but flexible self-supported films are easily obtained by filtering of these dispersions. As the electrical percolation threshold corresponds to sepiolite/GNP composites of 0.5:1 in weight, doping these systems with multiwalled carbon nanotubes (MWCNTs) significantly enhances their electrical conductivity. The particular microporosity of the sepiolite component allows interactions with molecules, such as organic dyes, as well as polymers, such as biopolymers, opening the way to functional materials for advanced applications due to their inherent conductivity afforded by the GNP and MWCNTs carbonaceous components. In fact, using very small amount of MWCNT together with GNP can obtain composites with significant electrical conductivity, maintaining the enhanced mechanical properties, at a lower cost.
Peer review: yes
URI: http://hdl.handle.net/10773/19811
DOI: 10.1002/adfm.201603103
ISSN: 1616-301X
Publisher Version: 10.1002/adfm.201603103
Appears in Collections:CICECO - Artigos

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