Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/48476

TitleHigh-performance graphene-based carbon nanofiller/polymer composites for piezoresistive sensor applications
Author(s)Costa, P.
Nunes-Pereira, J.
Oliveira, J.
Silva, J.
Moreira, J. Agostinho
Carabineiro, S. A. C.
Buijnsters, J.G.
Lanceros-Méndez, S.
KeywordsFunctional composites
Polymer-matrix composites (PMCs)
Electrical properties
Scanning electron microscopy (SEM)
Casting
Issue dateDec-2017
PublisherElsevier
JournalComposites Science and Technology
CitationCosta, P., Nunes-Pereira, J., Oliveira, & et.al. (2017). High-performance graphene-based carbon nanofiller/polymer composites for piezoresistive sensor applications. Composites Science and Technology, 153, 241-252
Abstract(s)Poly(vinylidene fluoride) (PVDF) composites with different carbonaceous nanofillers, prepared by solution casting, were studied their chemical, mechanical, electrical and electro-mechanical properties evaluated. Few-layer graphene (FLG) nanoplatelets (G-NPL), graphene oxide (GO) and reduced graphene oxide (rGO) and single-walled carbon nanohorns (SWCNH)) were found to have a strong influence in the overall properties of the composites prepared with up to 5 wt% nanofiller contents. The mechanical strainof carbonaceous nanofillers/PVDF composites decreases from 15% to near 5% of maximum strain. The electrical percolation threshold depends on the nanofiller type, being below 1 wt% for rGO and near 2 wt% for the remaining nanofillers. The electrical conductivity shows a maximum increase of nine orders of magnitude, from σ ≈ 5×10-11 S/m of pure PVDF to σ ≈ 1×10-2 S/m for rGO/PVDF composites with 5 wt% nanofillers, the conduction mechanism being related to hopping between the carbonaceous nanofillers for concentrations higher than the percolation threshold. Furthermore, the composites show electro-mechanical properties, except for G-NPL materials, with rGO/PVDF composites with 5 wt% nanofiller content showing higher Gauge factor (GF) values, reaching GF≈ 11 for deformations between 0.5 and 2mm in 4-point bending experiments. These results demonstrate the suitability of the composites for strain sensing applications.
TypeArticle
URIhttp://hdl.handle.net/1822/48476
DOI10.1016/j.compscitech.2017.11.001
ISSN0266-3538
Publisher versionhttps://www.sciencedirect.com/science/article/pii/S0266353817322297
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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