The electronic transport properties and microstructure of carbon nanofiber/epoxy composites

Allaoui, Aïssa; Hoa, Suong V.; Pugh, Martin

doi:10.1016/j.compscitech.2007.06.028

Cited by 125 publications

(65 citation statements)

References 20 publications

(32 reference statements)

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“…7 also the contact network model despite of its original use to represent the electronic transport properties of carbon nanofiber/epoxy resin composites and CNT tangles of moderate CNT volume fractions (up to 0.2) [5,20]. Moreover, the contact resistance power law model R CONTACT = Kφ n (see [5]) is used here also to evaluate the contact resistance between crossing MWCNT in our network (Fig.…”

Section: Mwcnt Network and Contact Resistancementioning

confidence: 99%

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Slobodian

Riha

Olejník

2011

Lecture Notes in Electrical Engineering

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Abstract.A network of entangled multiwall carbon nanotubes and the composite consisting of filter-supported multiwall carbon nanotube network are conductors whose conductivity is sensitive to compressive stress both in the course of monotonic stress growth and when loading/unloading cycles are imposed. The testing has shown as much as 100% network conductivity increase at the maximum applied stress. The entangled carbon nanotube networks are prepared by vacuum filtration method and peeled off from the filter. The carbon nanotubes are used in pristine condition or chemically functionalized. The filtersupported entangled networks are prepared by the nanotube dispersion filtration through a non-woven flexible polystyrene filter. The nanotubes infiltrate partly into the filter surface pores and link the accumulated filtrate layer with the filtering mat. The filter-support increases nanotube network mechanical integrity, the composite tensile ultimate strength and affects favorably the composite electrical resistance. Other obvious effect of the supporting polymer is reduction of the resistance temperature dependence. Moreover, the conductivity of carbon nanotube networks manifests also organic vapor dependence. The dependence is reversible, reproducible, selective as well as influenced by nanotube oxidation.

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Section: Mwcnt Network and Contact Resistancementioning

confidence: 99%

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Slobodian

Riha

Olejník

2011

Lecture Notes in Electrical Engineering

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“…-1/3 [33], i.e., n = 1/3, while in the case of a three-dimensional random fibre network d is proportional to ! -1 (n = 1) [34]. We have shown in one of our previous works [20] that the electrical response of similar foams of PP containing variable concentrations of carbon nanofibres (CNFs) followed a tunnel-like behaviour, with foams showing higher electrical conductivities than the solid composites due to CNF aggregate rupture during foaming and excluded volume related to cell formation [35], pushing CNFs closer and effectively reducing d. These foams presented a behaviour that resembled that of a conductive network system formed by random-distributed conductive fibres (n = 1), while the solid composites showed an electrical behaviour where d was proportional to !…”

Section: Electrical Conductivitymentioning

confidence: 99%

Graphene nanoplatelets-reinforced polyetherimide foams prepared by water vapor-induced phase separation

Abbasi¹,

Antunes²,

Velasco³

2015

Express Polym. Lett.

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Abstract. The present work considers the preparation of medium-density polyetherimide foams reinforced with variable amounts of graphene nanoplatelets (1-10 wt%) by means of water vapor-induced phase separation (WVIPS) and their characterization . A homogeneous closed-cell structure with cell sizes around 10 µm was obtained, with foams exhibiting zero crystallinity according to X-ray diffraction (XRD). Thermogravimetric analysis under nitrogen showed a two-step thermal decomposition behaviour for both unfilled and graphene-reinforced foams, with foams containing graphene presenting thermal stability improvements, related to a physical barrier effect promoted by the nanoplatelets. Thermo-mechanical analysis indicated that the specific storage modulus of the nanocomposite foams significantly increased owing to the high stiffness of graphene and finer cellular morphology of the foams. Although foamed nanocomposites displayed no further sign of graphene nanoplatelets exfoliation, the electrical conductivity of these foams was significant even for low graphene contents, with a tunnel-like model fitting well to the evolution of the electrical conductivity with the amount of graphene.

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“…The disorder constant "a" is related to δ max [18] and in this work we restrain ourselves to the weak disorder regime. This regime has already been observed experimentally [10,18,22] and can be described by the following linear relation: log(σ) ~Φ -1/3 [18]. For that, we set δ max = ξ , with ξ being the correlation length that depends on the length of the optimal path between two fillers [18].…”

Section: Resultsmentioning

confidence: 99%

The influence of matrix mediated hopping conductivity, filler concentration, aspect ratio and orientation on the electrical response of carbon nanotube/polymer nanocomposites

Silva

Ribeiro

Lanceros-Méndez

et al. 2011

Composites Science and Technology

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To cite this version:J. Silva, S. Ribeiro, S. Lanceros-Mendez, R. Simões. The influence of matrix mediated hopping conductivity, filler concentration, aspect ratio and orientation on the electrical response of carbon nanotube/polymer nanocomposites. Composites Science and Technology, Elsevier, 2011, 71 (5) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractA model to simulate the conductivity of carbon nanotube/polymer nanocomposites is presented. The proposed model is based on hopping between the fillers. A parameter related to the influence of the matrix in the overall composite conductivity is defined. It is demonstrated that increasing the aspect ratio of the fillers will increase the conductivity.Finally, it is demonstrated that the alignment of the filler rods parallel to the measurement direction results in higher conductivity values, in agreement with results from recent experimental work.

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The electronic transport properties and microstructure of carbon nanofiber/epoxy composites

Cited by 125 publications

References 20 publications

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Electromechanical Sensors Based on Carbon Nanotube Networks and Their Polymer Composites

Graphene nanoplatelets-reinforced polyetherimide foams prepared by water vapor-induced phase separation

The influence of matrix mediated hopping conductivity, filler concentration, aspect ratio and orientation on the electrical response of carbon nanotube/polymer nanocomposites

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