Electrical Properties of CNT-Based Polymeric Matrix Nanocomposites

Chiolerio, Alessandro; Castellino, Micaela; Jagdale, Pravin; Giorcelli, Mauro; Bianco, Stefano; Tagliaferro, Alberto

doi:10.5772/18900

Cited by 18 publications

(24 citation statements)

References 25 publications

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“…This non-linear characteristic is also reported based on the analysis and simulations for CNT nanocomposites near a percolation threshold [36]. Additionally, polyvinyl butyral and polydimethylsiloxane CNT composites with higher loadings over a narrower voltage range and with higher CNT loading percentages have been reported to have non-linear resistance characteristics [37].…”

Section: Conditions That Promote Surface Changes or Evidence Of Incipsupporting

confidence: 61%

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: Conditions That Promote Surface Changes or Evidence Of Incipsupporting

confidence: 61%

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

et al. 2020

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“…In Fig. 7d, the direct creep comparison of plain PVB and PVB with CNTs is shown; the insertion of 1% CNTs strengthens the material, whereas the addition of 3 and 5% CNTs reveals a rather creep behavior, which is in line with the nanotube-nanotube slipping assumption, probably attributed to the fact that at 3 and 5 wt% the percolation threshold [62] is overcome and a CNTs network is present. Nanoindentation tends to produce relatively high local stresses and it is fairly common experience for these to generate obvious time-dependent effects, such as progressive indenter penetration when a constant load is maintained.…”

Section: Creep Investigation-onset Of Plasticitysupporting

confidence: 55%

Nanomechanical and tribological properties of carbon nanotube/polyvinyl butyral composites

et al. 2013

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The surface and subsurface mechanical and tribological properties of multiwall carbon nanotube (MWCNTs)/polyvinyl butyral (PVB) composites have been studied. Hardness and elastic modulus were obtained from nanoindentation, whereas the coefficient of friction of the composites was obtained using a nanoscratch method. The results show a clear impact of the percentage of CNTs filling on the monitored properties. Considerable improvement in the scratch resistance is obtained by the addition of CNTs and a maximum increase in nanomechanical properties is found at intermediate levels of CNTs filling. Creep studies revealed that a higher loading rate results in a greater primary creep deformation and leads to an increase of the total creep deformation, whereas the addition of MWCNTs affects the elastic recovery of the PVB matrix. POLYM. COMPOS., 34:1950COMPOS., 34: -1960COMPOS., 34: , 2013

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“…A more detailed description of the samples was reported by some of us elsewhere. 20,23,31 In order to perform the measurement of the thermal conductivity with LFT, each sample was…”

Section: Methodsmentioning

confidence: 99%

Effects of Functionalization on Thermal Properties of Single-Wall and Multi-Wall Carbon Nanotube–Polymer Nanocomposites

et al. 2013

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Carboxylic functionalization (-COOH groups) of carbon nanotubes is known to improve their dispersion properties and increase the electrical conductivity of carbon-nanotubepolymer nanocomposites. We have studied experimentally the effects of this type of functionalization on the thermal conductivity of the nanocomposites. It was found that while even small quantities of carbon nanotubes (~1 wt%) can increase the electrical conductivity, a larger loading fraction (~3 wt%) is required to enhance the thermal conductivity of nanocomposites. Functionalized multi-wall carbon nanotubes performed the best as filler material leading to a simultaneous improvement of the electrical and thermal properties of the composites. Functionalization of the single-wall carbon nanotubes reduced the thermal conductivity enhancement. The observed trends were explained by the fact that while surface functionalization increases the coupling between carbon nanotube and polymer matrix it also leads to formation of defects, which impede the acoustic phonon transport in the single wall carbon nanotubes. The obtained results are important for applications of carbon nanotubes and graphene flakes as fillers for improving thermal, electrical and mechanical properties of composites.

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Electrical Properties of CNT-Based Polymeric Matrix Nanocomposites

Cited by 18 publications

References 25 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

Nanomechanical and tribological properties of carbon nanotube/polyvinyl butyral composites

Effects of Functionalization on Thermal Properties of Single-Wall and Multi-Wall Carbon Nanotube–Polymer Nanocomposites

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