Doping Effect of Poly(vinylidene fluoride) on Carbon Nanofibers Deduced by Thermoelectric Analysis of Their Melt Mixed Films

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dc.contributor.authorPaleo, A. J.
dc.contributor.authorSerrato, V. M.
dc.contributor.authorManuel, J. M.
dc.contributor.authorToledano, O.
dc.contributor.authorMunoz, E.
dc.contributor.authorMelle-Franco, M.
dc.contributor.authorKrause, B.
dc.contributor.authorPoetschke, P.
dc.contributor.authorLozano, K.
dc.date.accessioned2025-01-20T16:06:33Z
dc.date.available2025-01-20T16:06:33Z
dc.date.issued2024
dc.description.abstractThe effect of temperature on the electrical conductivity (sigma) and Seebeck coefficient (S) of n-type vapor grown carbon nanofibers (CNFs) and poly(vinylidene fluoride) (PVDF) melt-mixed with 15 wt% of those CNFs is analyzed. At 40 degrees C, the CNFs show stable n-type character (S=-4.8 mu V<middle dot>K-1) with an sigma of ca.165 S<middle dot>m-1, while the PVDF/CNF composite film shows an sigma of ca. 9 S<middle dot>m-1 and near-zero S (S=-0.5 mu V<middle dot>K-1). This experimental reduction in S is studied by the density functional tight binding (DFTB) method revealing a contact electron transfer from the CNFs to the PVDF in the interface. Moreover, in the temperature range from 40 degrees C to 100 degrees C, the sigma(T) of the CNFs and PVDF/CNF film, successfully described by the 3D variable range hopping (VRH) model, is explained as consequence of a thermally activated backscattering mechanism. On the contrary, the S(T) from 40 degrees C to 100 degrees C of the PVDF/CNF film, which satisfactorily matches the model proposed for some multi-walled carbon nanotube (MWCNT) doped mats; however, it does not follow the increase in S(T) found for CNFs. All these findings are presented with the aim of discerning the role of these n-type vapor grown carbon nanofibers on the sigma and S of their melt-mixed polymer composites.
dc.fuente.origenWOS
dc.identifier.doi10.1007/s10118-024-3200-y
dc.identifier.eissn1439-6203
dc.identifier.issn0256-7679
dc.identifier.urihttps://doi.org/10.1007/s10118-024-3200-y
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/89965
dc.identifier.wosidWOS:001329815800001
dc.language.isoen
dc.revistaChinese journal of polymer science
dc.rightsacceso restringido
dc.subjectCarbon nanofibers
dc.subjectPoly(vinylidene fluoride)
dc.subjectSeebeck coefficient
dc.subjectP-type doping
dc.subjectDensity functional based tight binding
dc.subjectVariable range hopping
dc.titleDoping Effect of Poly(vinylidene fluoride) on Carbon Nanofibers Deduced by Thermoelectric Analysis of Their Melt Mixed Films
dc.typeartículo
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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