Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/108626
Author(s): | Sónia Carabineiro P. Costa J. Nunes-Pereira J. Oliveira J. Silva J. Agostinho Moreira J.G. Buijnsters S. Lanceros-Mendez |
Title: | High-performance graphene-based carbon nanofiller/polymer composites for piezoresistive sensor applications |
Issue Date: | 2017 |
Abstract: | 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 strain of 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 sigma approximate to 5 x 10(-11) S/m of pure PVDF to sigma approximate to 1 x 10(-2) Sim 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 approximate to 11 for deformations between 0.5 and 2 mm in 4-point bending experiments. These results demonstrate the suitability of the composites for strain sensing applications. |
URI: | https://hdl.handle.net/10216/108626 |
Document Type: | Artigo em Revista Científica Internacional |
Rights: | restrictedAccess |
Appears in Collections: | FEUP - Artigo em Revista Científica Internacional |
Files in This Item:
File | Description | Size | Format | |
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228463.pdf Restricted Access | Composites Science and Technology 2017, 153, 241-252 | 3.48 MB | Adobe PDF | Request a copy from the Author(s) |
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