Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/11110/303 |
Resumo: | The influence of the dispersion of vapor grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/epoxy composites has been studied. A homogeneous dispersion of the VGCNF does not imply better electrical properties. The presence of well distributed clusters appears to be a key factor for increasing composite conductivity. It is also shown that the main conduction mechanism has an ionic nature for concentrations below the percolation threshold, while above the percolation threshold it is dominated by hopping between the fillers. Finally, using the granular system theory it is possible to explain the origin of conduction at low temperatures. |
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Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levelsComposite materialsPolymer-based compositesPercolationLow temperature measurementsThe influence of the dispersion of vapor grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/epoxy composites has been studied. A homogeneous dispersion of the VGCNF does not imply better electrical properties. The presence of well distributed clusters appears to be a key factor for increasing composite conductivity. It is also shown that the main conduction mechanism has an ionic nature for concentrations below the percolation threshold, while above the percolation threshold it is dominated by hopping between the fillers. Finally, using the granular system theory it is possible to explain the origin of conduction at low temperatures.We acknowledge the Foundation for Science and Technology,Lisbon, for the financial support through the 3 Quadro Comunitário de Apoio, the POCTI and FEDER programs, projects PTDC/CTM/69316/2006, NANO/NMed-SD/0156/2007, and PEst-C/CTM/LA0025/2011. We also acknowledge the FCT grants SFRH/ BD/60623/2009 (J.S.) and SFRH/BD/41191/2007 (P.C.), the Joint Luso-American Foundation (FLAD)–NSF U.S. Research Networks Program research grant (F.W.J.v.H. and D.K.). We also thank Albemarle for the hardener, Hexion Specialty Chemicals for the epoxy resin and Applied Sciences for providing their facilities. We also thank to J. Oliveira for the collaboration.Physics Letters A2013-11-20T18:08:11Z2012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/11110/303oai:ciencipca.ipca.pt:11110/303enghttp://hdl.handle.net/11110/303metadata only accessinfo:eu-repo/semantics/openAccessCardoso, P.Silva, J.Agostinho Moreira, J.Klosterman, D.van Hattum, F.W.J.Simões, RicardoLanceros-Mendez, S.reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-09-05T12:51:52Zoai:ciencipca.ipca.pt:11110/303Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:00:42.955451Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels |
title |
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels |
spellingShingle |
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels Cardoso, P. Composite materials Polymer-based composites Percolation Low temperature measurements |
title_short |
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels |
title_full |
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels |
title_fullStr |
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels |
title_full_unstemmed |
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels |
title_sort |
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels |
author |
Cardoso, P. |
author_facet |
Cardoso, P. Silva, J. Agostinho Moreira, J. Klosterman, D. van Hattum, F.W.J. Simões, Ricardo Lanceros-Mendez, S. |
author_role |
author |
author2 |
Silva, J. Agostinho Moreira, J. Klosterman, D. van Hattum, F.W.J. Simões, Ricardo Lanceros-Mendez, S. |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Cardoso, P. Silva, J. Agostinho Moreira, J. Klosterman, D. van Hattum, F.W.J. Simões, Ricardo Lanceros-Mendez, S. |
dc.subject.por.fl_str_mv |
Composite materials Polymer-based composites Percolation Low temperature measurements |
topic |
Composite materials Polymer-based composites Percolation Low temperature measurements |
description |
The influence of the dispersion of vapor grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/epoxy composites has been studied. A homogeneous dispersion of the VGCNF does not imply better electrical properties. The presence of well distributed clusters appears to be a key factor for increasing composite conductivity. It is also shown that the main conduction mechanism has an ionic nature for concentrations below the percolation threshold, while above the percolation threshold it is dominated by hopping between the fillers. Finally, using the granular system theory it is possible to explain the origin of conduction at low temperatures. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-01-01T00:00:00Z 2013-11-20T18:08:11Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/11110/303 oai:ciencipca.ipca.pt:11110/303 |
url |
http://hdl.handle.net/11110/303 |
identifier_str_mv |
oai:ciencipca.ipca.pt:11110/303 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
http://hdl.handle.net/11110/303 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Physics Letters A |
publisher.none.fl_str_mv |
Physics Letters A |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799129877124743168 |