Thermoresistive mechanisms of carbon nanotube/polymer composites

Cen-Puc, Marco; Oliva-Avilés, A.I.; Avilés, F.

doi:10.1016/j.physe.2017.09.001

Cited by 37 publications

(38 citation statements)

References 66 publications

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“…Identifying the role that each mechanism plays in the electrical properties of extremely low loading CNT composites and realizing an effective and straightforward model are challenging. Changes in resistivity with varying temperatures for CNT composites are impacted by CNT loading, matrix properties, changes to tunneling conduction at different temperatures, conductive properties of CNTs, contact resistance between CNTs, and other factors as demonstrated in this research and in others [15,30,31,33,35,42,44,46,47].…”

Section: Mechanisms Responsible For the Electrical Properties Trends supporting

confidence: 53%

Impact of Current and Temperature on Extremely Low Loading Epoxy-CNT Conductive Composites

et al. 2020

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Carbon nanotube (CNT) conductive composites have attracted significant attention for their potential use in applications such as electrostatic dissipation and/or electromagnetic interference shielding. The focus of this work is to evaluate resistivity trends of extremely low loading (<0.1 wt%) epoxy-CNT composites that lack a connected CNT network, but still present electrical conductivity values appropriate for those uses. The impact of current, temperature, and cycle life on electrical properties are here identified and tied to possible performance limits. At extremely low loadings, the CNT content is not sufficient to form a completely interconnected grid, thus, electrons must travel through insulating media. While still in the semi-conductor range, resistivity values are observed to decrease with increasing direct current and demonstrate a non-ohmic behavior. CNT epoxy composites were subjected to elevated currents and/or temperatures over diverse periods of time to examine impacts on resistivity. Microstructural analyses of composite samples were conducted to observe signs of damage for specimens taken to extreme temperatures/currents. An understanding of the electrical conductivity characteristics of extremely low loading epoxy-CNT composites and their failure mechanisms will aid in understanding risks associated with their use in challenging environments that may include high temperatures, high currents, and/or high frequencies.

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Section: Mechanisms Responsible For the Electrical Properties Trends supporting

confidence: 53%

Impact of Current and Temperature on Extremely Low Loading Epoxy-CNT Conductive Composites

et al. 2020

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“…Electrical conductivity in polymer nanocomposites containing conductive nanofiller such as carbon nanotubes (CNT) provides some applications in electronics, shielding, actuating, and sensing . The conductivity of nanocomposites meaningfully improves at a critical concentration as percolation threshold, because the number of nanoparticles at this point is enough to establish the conductive networks .…”

Section: Introductionmentioning

confidence: 99%

Significances of interphase conductivity and tunneling resistance on the conductivity of carbon nanotubes nanocomposites

Zare

Rhee

2019

Polymer Composites

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This article expresses a simple model for prediction of conductivity in polymer carbon nanotubes (CNT) nanocomposites (PCNT). This model suggests the roles of CNT concentration, CNT dimensions, CNT conductivity, the percentage of networked CNT, interphase thickness and tunneling properties in the conductivity of PCNT. The suggested model is applied to predict the conductivity in several samples. In addition, the significances of all parameters attributed to CNT, interphase and tunneling regions on the predicted conductivity are justified to confirm the suggested model. The calculations of conductivity properly agree with the experimental results demonstrating the capability of suggested model for prediction of conductivity. Thick interphase increases the conductivity of nanocomposites, because it enlarges the conductive networks. In addition, high tunneling resistivity due to polymer layer, large tunneling distance between adjacent CNT and small tunneling diameter deteriorate the conductivity, because they enhance the tunneling resistance limiting the charge transferring via tunneling regions. The suggested model can replace the available models to predict the conductivity in future researches. K E Y W O R D Scarbon nanotubes (CNT), conductivity, interphase, polymer nanocomposites, tunneling effect

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“…Also, many studies have been carried out to predict not only mechanical properties, but also electrical properties [57][58][59][60][61][62][63], like electrical conductivity [35,59,[64][65][66][67][68][69][70][71][72][73][74][75][76], and dielectric permittivity [70,71,77]. Studies for the analysis of thermal properties have also been conducted, such as thermal conductivity [40,61,[78][79][80][81], and thermal expansion coefficient [82,83]. Moreover, the proposed models were used to investigate the following phenomena of the polymer nanocomposites.…”

Section: Continuum Approachmentioning

confidence: 99%

Recent Studies on the Multiscale Analysis of Polymer Nanocomposites

Chung

Cho

2019

Multiscale Sci. Eng.

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Ever since several formations of polymer-based nanocomposites were reported, research on their modeling, characterization, and computerized analysis methodology has been extensively investigated to become a major academic field of advanced material science and technology. This paper mainly summarizes the multiscale computational analysis methodology for polymer nanocomposites. We also introduce various computational modeling approaches to characterizing the physical behavior of polymer nanocomposites, which are the molecular dynamics approach, and the continuum approach. Based on the various computational analyses, we summarize how the material properties and phenomenological behaviors of polymer nanocomposites were analyzed.

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Thermoresistive mechanisms of carbon nanotube/polymer composites

Cited by 37 publications

References 66 publications

Impact of Current and Temperature on Extremely Low Loading Epoxy-CNT Conductive Composites

Impact of Current and Temperature on Extremely Low Loading Epoxy-CNT Conductive Composites

Significances of interphase conductivity and tunneling resistance on the conductivity of carbon nanotubes nanocomposites

Recent Studies on the Multiscale Analysis of Polymer Nanocomposites

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