Comparative Thermoelectric Properties of Polypropylene Composites Melt-Processed Using Pyrograf® III Carbon Nanofibers

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dc.catalogadorkjc
dc.contributor.authorAntonio J. Paleo
dc.contributor.authorDr. Beate Krause
dc.contributor.authorAna R. Mendes
dc.contributor.authorCarlos Jose Tavares
dc.contributor.authorMaria F. Cerqueira
dc.contributor.authorMunoz Tavera, Enrique
dc.contributor.authorPetra Pötschke
dc.date.accessioned2024-03-04T17:01:39Z
dc.date.available2024-03-04T17:01:39Z
dc.date.issued2023
dc.description.abstractThe electrical conductivity (σ) and Seebeck coefficient (S) at temperatures from 40 °C to 100 °C of melt-processed polypropylene (PP) composites filled with 5 wt.% of industrial-grade carbon nanofibers (CNFs) is investigated. Transmission Electron Microscopy (TEM) of the two Pyrograf® III CNFs (PR 19 LHT XT and PR 24 LHT XT), used in the fabrication of the PP/CNF composites (PP/CNF 19 and PP/CNF 24), reveals that CNFs PR 24 LHT XT show smaller diameters than CNFs PR 19 LHT XT. In addition, this grade (PR 24 LHT XT) presents higher levels of graphitization as deduced by Raman spectroscopy. Despite these structural differences, both Pyrograf® III grades present similar σ (T) and S (T) dependencies, whereby the S shows negative values (n-type character). However, the σ (T) and S (T) of their derivative PP/CNF19 and PP/CNF24 composites are not analogous. In particular, the PP/CNF24 composite shows higher σ at the same content of CNFs. Thus, with an additionally slightly more negative S value, the PP/CNF24 composites present a higher power factor (PF) and figure of merit (zT) than PP/CNF19 composites at 40 °C. Moreover, while the σ (T) and S (T) of CNFs PR 19 LHT XT clearly drive the σ (T) and S (T) of its corresponding PP/CNF19 composite, the S (T) of CNFs PR 24 LHT XT does not drive the S (T) observed in their corresponding PP/CNF24 composite. Thus, it is inferred in PP/CNF24 composites an unexpected electron donation (n-type doping) from the PP to the CNFs PR 24 LHT XT, which could be activated when PP/CNF24 composites are subjected to that increase in temperature from 40 °C to 100 °C. All these findings are supported by theoretical modeling of σ (T) and S (T) with the ultimate aim of understanding the role of this particular type of commercial CNFs on the thermoelectrical properties of their PP/CNF composites.
dc.fechaingreso.objetodigital2024-03-21
dc.fuente.origenORCID
dc.identifier.doi10.3390/jcs7040173
dc.identifier.urihttp://doi.org/10.3390/jcs7040173
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/83655
dc.identifier.wosidWOS:000977190600001
dc.information.autorucInstituto de Física; Munoz Tavera, Enrique; 0000-0003-4457-0817; 219540
dc.language.isoen
dc.nota.accesoContenido completo
dc.rightsacceso abierto
dc.titleComparative Thermoelectric Properties of Polypropylene Composites Melt-Processed Using Pyrograf® III Carbon Nanofibers
dc.typeartículo
sipa.codpersvinculados219540
sipa.trazabilidadORCID;2024-01-22
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