Low Electrical Percolation Threshold of Silver and Copper Nanowires in Polystyrene Composites

Gelves, Genaro A.; Lin, Bin; Sundararaj, Uttandaraman; Haber, Joel A.

doi:10.1002/adfm.200600336

Cited by 176 publications

(146 citation statements)

References 64 publications

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“…[46] In a 3-D composite consisting of a mixture of conducting rods in a polymer matrix, the rods tend to be randomly dispersed throughout a matrix, leading to a slightly differnet percolation scaling law which depends on the filler volume fraction, : S/m to σ ~ 10 4 S/m, which correlates to the theoretical value predicted by SEM for the first conductive pathway to form. The percolation threshold values reported here in this work were found to be in good agreement with other values calculated in literature for both layered [49] and mixed [50] composites using AgNWs of similar dimensions. From the electrical characterisation, it is very much apparent that the LBL method of composite production is superior to its mixed composite counterpart due to its much lower percolation threshold.…”

Section: Composite Electrical Propertiessupporting

confidence: 91%

Surface coatings of silver nanowires lead to effective, high conductivity, high-strain, ultrathin sensors

et al. 2017

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Abstract:Integrated sensors for bodily measurements require a sensing material that are highly conductive, flexible, thin and sensitive. It is important that these materials be non-invasive in application but robust in nature to allow for effective, continuous measurement. Herein, we report a comparative study of two simple, scalable methods to produce silver nanowire (AgNW) polyurethane (PU) composite materials: layer-by-layer (LBL) and mixed filtration.Both types of composites formed were ultrathin (~50 µm) and highly conductive (10 4 S/m), with the LBL method ultimately found to be superior due to its low percolation threshold.Electrical resistance of the LBL composites was found to vary with strain, making these materials suitable for strain sensing. LBL composites displayed a working strain up to ~250% and a high gauge factor (G), with values of G~70 reported. The sensors reported here were ~10 9 -times more conductive and ~10 4 -times thinner than their carbon-based composite sensor counterparts with similar gauge factor. This made the strain sensors presented here among one of the most flexible, highly sensitive, thinnest, conductive materials in literature.We demonstrated that with these properties, the LBL composites formed were ideal for bodily motion detection. Introduction:

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Section: Composite Electrical Propertiessupporting

confidence: 91%

Surface coatings of silver nanowires lead to effective, high conductivity, high-strain, ultrathin sensors

et al. 2017

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“…Micrometer (5 and 10 μm) long Ag and Cu nanowires having a diameter of 25 nm fabricated using template based method mixed with polystyrene. The composites attained a low percolation at a 0.25 and 0.75 vol% (Gelves et al 2006). Further study showed that unfunctionalized Cu nanowires having a diameter of 25 nm and length 1.78 μm able to form electrical conductive networks at 0.5 vol% whereas for functionalized nanowires it is 0.25 vol%.…”

Section: Nanowire Compositesmentioning

confidence: 98%

Nanowire-Polymer Nanocomposites as Thermal Interface Material

Razeeb¹,

Dalton²

2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

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“…With this goal in mind, elongated fillers with diameters on the micron scale, such as stainless steel fibers or metallized glass fibers, were already being employed in the early 1980s [8]. In nanocomposites, in addition to CNTs, insulating polymers have also been loaded with short conducting carbon fibers [11] and metal nanowires [12,13].…”

Section: Introductionmentioning

confidence: 99%

Depletion-interaction effects on the tunneling conductivity of nanorod suspensions

et al. 2013

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Further information on publisher's website:http://dx.doi.org/10.1103/PhysRevE.88.042140Publisher's copyright statement:Reprinted with permission from the American Physical Society: Phys. Rev. E 88, 042140 c 2013 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society. Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We study by simulation and theory how the addition of insulating spherical particles affects the conductivity of fluids of conducting rods, modeled by spherocylinders. The electrical connections are implemented as tunneling processes, leading to a more detailed and realistic description than a discontinuous percolation approach. We find that the spheres enhance the tunneling conductivity for a given concentration of rods and that the enhancement increases with rod concentration into the regime where the conducting network is well established. By reformulating the network of rods using a critical path analysis, we quantify the effect of depletion-induced attraction between the rods due to the spheres. Furthermore, we show that our conductivity data are quantitatively reproduced by an effective-medium approximation, which explicitly relates the system tunneling conductance to the structure of the rod-sphere fluid.

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Low Electrical Percolation Threshold of Silver and Copper Nanowires in Polystyrene Composites

Cited by 176 publications

References 64 publications

Surface coatings of silver nanowires lead to effective, high conductivity, high-strain, ultrathin sensors

Surface coatings of silver nanowires lead to effective, high conductivity, high-strain, ultrathin sensors

Nanowire-Polymer Nanocomposites as Thermal Interface Material

Depletion-interaction effects on the tunneling conductivity of nanorod suspensions

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