Relationship between electromechanical response and percolation threshold in carbon nanotube/poly(vinylidene fluoride) composites

This paper reports on the piezoresistive response of carbon nanotube/poly(vinylidene fluoride), CNT/PVDF, composites prepared with different CNT types with and without functionalization, via in situ-generated diazonium compounds. The results show that for a CNT concentration close to the percolation...

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Bibliographic Details
Published in:Carbon (New York) 2013-09, Vol.61, p.568-576
Main Authors: Ferreira, A., Martínez, M.T., Ansón-Casaos, A., Gómez-Pineda, L.E., Vaz, F., Lanceros-Mendez, S.
Format: Article
Language:English
Subjects:
Carbon
Carbon nanotubes
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fluorides
Materials science
Nanoscale materials and structures: fabrication and characterization
Nanotubes
Percolation
Physics
Piezoresistance
Polyvinylidene fluorides
Thermoplastic resins
Thresholds
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Summary:This paper reports on the piezoresistive response of carbon nanotube/poly(vinylidene fluoride), CNT/PVDF, composites prepared with different CNT types with and without functionalization, via in situ-generated diazonium compounds. The results show that for a CNT concentration close to the percolation threshold, tunneling is the main mechanism responsible for the electrical response, leading also to a significant increase of the piezoresistance of the composites. Interestingly, this fact is independent of the CNT type or functionalization, as well as of the percolation threshold concentration. In this way, a close relationship between the percolation threshold and the piezoresistive response was demonstrated. The electromechanical response, as characterized by the gauge factor, reach values up to 3.9, being among the largest obtained for thermoplastic composites and demonstrating the suitability of these materials for sensor applications.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2013.05.038