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Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels

Bibliographic Details
Main Author: Cardoso, P.
Publication Date: 2012
Other Authors: Silva, J., Agostinho Moreira, J., Klosterman, D., van Hattum, F.W.J., Simões, Ricardo, Lanceros-Mendez, S.
Format: Article
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: http://hdl.handle.net/11110/303
Summary: 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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spelling 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:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2022-09-05T12:51:52Zoai:ciencipca.ipca.pt:11110/303Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-28T10:01:32.479457Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
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:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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