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Thermoelectric properties of bulk multi-walled carbon nanotube - poly(vinylidene fluoride) nanocomposites: Study of the structure/property relationships

Abstract : The cross-plane thermoelectric properties of multi-walled carbon nanotubes-poly(vinylidene fluoride) (MWCNT-PVDF) nanocomposites were investigated at room temperature as a function of MWCNT content (from 5 to 50 wt%). Special attention was paid to the influence of the nature of the polymer crystal phase. Incorporation of MWCNT induces PVDF polar β-phase formation, coexisting with the major non polar α-phase. Significant improvement of the thermoelectric properties is evidenced, with the best values obtained at 50 wt% MWCNT loading. A post treatment at high temperature (T =165 °C) results in the development of the polar γ-phase from the α- and β-polymorphs. Nanocomposites annealing significantly enhances the Seebeck coefficient, typically from 14 up to 20 μV K−1, yielding a power factor of 4.6 × 10−2 μW m−1 K−2 and a figure of merit ZT of 1.6 × 10−5 at 50 wt%, which is the best ZT value that can be found in the literature, regarding MWCNT-PVDF bulk nanocomposites. Structural analysis underlines for the first time the impact of the polymer polar γ-phase on the nanocomposite thermoelectric properties.
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https://hal.univ-lille.fr/hal-02964071
Contributeur : Lilloa Université de Lille <>
Soumis le : lundi 12 octobre 2020 - 10:20:41
Dernière modification le : mardi 13 octobre 2020 - 03:31:33

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Jean-Francois Brun, Corinne Binet, Jean-Francois Tahon, Ahmed Addad, Pauline Tranchard, et al.. Thermoelectric properties of bulk multi-walled carbon nanotube - poly(vinylidene fluoride) nanocomposites: Study of the structure/property relationships. Synthetic Metals, Elsevier, 2020, Synthetic Metals, pp.116525. ⟨10.1016/j.synthmet.2020.116525⟩. ⟨hal-02964071⟩

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