Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/82718
Título: | Thermoelectric properties of n-type poly (ether ether ketone)/carbon nanofiber melt-processed composites |
Autor(es): | Paleo, Antonio J. Krause, Beate Soares, Delfim Melle-Franco, Manuel Muñoz, Enrique Pötschke, Petra Rocha, A. M. |
Palavras-chave: | Carbon nanofibers Poly(ether ether ketone) Conductive polymer composites Seebeck coefficient Variable-range hopping Electronic doping |
Data: | 8-Nov-2022 |
Editora: | Multidisciplinary Digital Publishing Institute (MDPI) |
Revista: | Polymers |
Citação: | Paleo, A.J.; Krause, B.; Soares, D.; Melle-Franco, M.; Muñoz, E.; Pötschke, P.; Rocha, A.M. Thermoelectric Properties of N-Type Poly (Ether Ether Ketone)/Carbon Nanofiber Melt-Processed Composites. Polymers 2022, 14, 4803. https://doi.org/10.3390/polym14224803 |
Resumo(s): | The thermoelectric properties, at temperatures from 30 °C to 100 °C, of melt-processed poly(ether ether ketone) (PEEK) composites prepared with 10 wt.% of carbon nanofibers (CNFs) are discussed in this work. At 30 °C, the PEEK/CNF composites show an electrical conductivity (σ) of ~27 S m<sup>−1</sup> and a Seebeck coefficient (S) of −3.4 μV K<sup>−1</sup>, which means that their majority charge carriers are electrons. The origin of this negative Seebeck is deduced because of the impurities present in the as-received CNFs, which may cause sharply varying and localized states at approximately 0.086 eV above the Fermi energy level (E<sub>F</sub>) of CNFs. Moreover, the lower S, in absolute value, found in PEEK/CNF composites, when compared with the S of as-received CNFs (−5.3 μV K<sup>−1</sup>), is attributed to a slight electron withdrawing from the external layers of CNFs by the PEEK matrix. At temperatures from 30 °C to 100 °C, the σ (T) of PEEK/CNF composites, in contrast to the σ (T) of as-received CNFs, shows a negative temperature effect, understood through the 3D variable-range hopping (VRH) model, as a thermally activated hopping mechanism across a random network of potential wells. Moreover, their nonlinear S (T) follows the same behavior reported before for polypropylene composites melt-processed with similar CNFs at the same interval of temperatures. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/82718 |
DOI: | 10.3390/polym14224803 |
e-ISSN: | 2073-4360 |
Versão da editora: | https://www.mdpi.com/2073-4360/14/22/4803 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | DET/2C2T - Artigos em revistas internacionais com arbitragem científica |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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polymers-14-04803-v2.pdf | 3,41 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons