The effect of aspect ratio on the piezoresistive behavior of the multiwalled carbon nanotubes/thermoplastic elastomer nanocomposites

Zha, Jun‐Wei; Shehzad, Khurram; Li, Weikang; Dang, Zhi‐Min

doi:10.1063/1.4772747

Cited by 30 publications

(8 citation statements)

References 30 publications

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“…Such deviation in t value from above mentioned universal range is also reported at various places with different reasons . Zha et al studied the effect of aspect ratio of CNTs on the behavior of thermoplastic elastomer composites and observed higher values of t with 4.53, 3.42, 3.02, and 4.5 This proves that only the change in length to diameter ratio causes a big change in the universal value of t . In present case, CNTs are decorated with PANI by growing PANI at the surface of CNTs.…”

Section: Resultssupporting

confidence: 63%

“…Conducting fillers could essentially improve the leading properties of insulating polymers. Diverse fillers such as metals nanostructures , conducting polymers , carbon black , graphene , and multiwalled carbon nanotubes (CNTs) have been utilized to enhance the electrical properties of polymers. CNTs have got unique mechanical, electrical, and thermal properties which make them exceptionally valuable in this context .…”

Section: Introductionmentioning

confidence: 99%

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Tailoring electrical and thermal properties of polymethyl methacrylate‐carbon nanotubes composites through polyaniline and dodecyl benzene sulphonic acid impregnation

et al. 2017

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A series of composites of polymethyl methacrylate (PMMA) with polyaniline‐multiwalled carbon nanotubes (PANI‐CNTs) as filler I and dodecyl benzene sulphonic acid‐multiwalled carbon nanotubes (DBSA‐CNTs) as filler II are developed by solution mixing method. Composites are characterized for morphological, electrical, and thermal properties to study effect of two different types of additives, PANI, and DBSA. Furthermore, their influence on dispersion of CNTs is also studied. Electrical percolation behavior of both composites series is investigated through dielectric and conductivity measurements. Sharp insulators to conductor transition curves are obtained for filler I and II, with conductivity of 5.6 S cm−1 at 2 wt% of CNTs and 2 S cm−1 at 3 wt% of CNTs, respectively. High dielectric constant is observed for filler I as compared to filler II due to the formation of comparatively big clusters of filler I than II. Theoretically calculated percolation threshold was found to be 1.3 wt% for filler I and 0.8 wt% for filler II in the matrix with exponent constants 2.4 and 1.25, respectively. Thermal stability of PMMA composites, containing filler II, indicated an impressive increase by 72°C onset and 55°C in complete degradation temperature as compared to pure PMMA. POLYM. COMPOS., 39:E1052–E1059, 2018. © 2017 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Tailoring electrical and thermal properties of polymethyl methacrylate‐carbon nanotubes composites through polyaniline and dodecyl benzene sulphonic acid impregnation

et al. 2017

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“…Among those various attractive properties, their piezoresistive behavior makes CNT a good candidate to function as a strain sensing material. In recent years, many researchers have already investigated a diverse array of CNT-based sensors with different structures, including pristine CNTs assemblies (pure CNT yarns [3,13,14] and bucky paper [15][16][17][18]) and CNT/polymer hybrid composites with random or aligned CNT dispersions (CNT fibers [19][20][21][22][23][24], films and bulk composite [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61]). However, the existing CNTbased strain sensors suffer from different issues which often limit their further development in practical applications.…”

Section: Motivation and Objectivesmentioning

confidence: 99%

Aligned carbon nanotube sheet piezoresistive strain sensors

Bogdanovich

Bradford

2015

Smart Mater. Struct.

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LI, ANG. Aligned Carbon Nanotube Sheet Piezoresistive Strain Sensors. (Under the direction of Dr. Philip Bradford). With the application of advanced composites rapidly increasing into the aerospace and transportation industries, real time structural health monitoring (SHM) systems are attracting great attention in the composites research community. Carbon nanotubes (CNTs) have a unique set of properties that may be used for the production of a new generation strain/damage sensing materials. This research is going to introduce a novel CNT ensemble based strain sensor. The CNT sheet strain sensors were made with aligned CNT sheets and fiberglass/epoxy prepregs in a very convenient and efficient way. To evaluate the piezoresistive performance of the sensors, various types of mechanical tests were conducted with real-time electrical data acquisition. Specimens with orthogonal CNTs orientations were tested independently to investigate the influence of CNT orientation on piezoresistive behavior. The working mechanisms during mechanical straining were also discussed accordingly. Generally, the tested sensors were found to exhibit fairly good sensing stability, linearity, sensitivity and repeatability at a useful functional strain range, which is favorable for health monitoring of advanced composite material structures. It was also demonstrated that the CNT orientations have great effect on the sensitivity of sensors, leading to other promising applications such as directional strain/stress monitoring. Finally, a pre-straining process was intentionally applied, which enhanced the linearity and long-term dynamic stability of the piezoresistive sensing performance.

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“…However, in the CNT based low percolation threshold composite systems a slight change in external conditions such as temperature and pressure can lead to drastic changes in the electrical properties. [16][17][18]21,22 Moreover, lower percolation threshold values usually results in very sharp percolation curves that leaves us with a very narrow concentration window to manipulate the electrical conductivity values. For several practical purposes, a reasonably large percolation threshold values with comparatively wider percolation curves are required.…”

Section: Introductionmentioning

confidence: 99%

Influence of carbon nanotube dimensions on the percolation characteristics of carbon nanotube/polymer composites

Shehzad

Ahmad

Hussain

et al. 2014

Journal of Applied Physics

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Evidence of percolation related power law behavior in the thermal conductivity of nanotube/polymer composites Appl. Phys. Lett. 102, 243105 (2013); 10.1063/1.4811497 Non-monotonic dependence of the conductivity of carbon nanotube-filled elastomers subjected to uniaxial compression/decompression J. Appl. Phys. 113, 103706 (2013); 10.1063/1.4794835 Effect of filler auto-assembly on percolation transition in carbon nanotube/polymer composites Appl. Phys. Lett. 102, 011907 (2013); 10.1063/1.4773994The effect of aspect ratio on the piezoresistive behavior of the multiwalled carbon nanotubes/thermoplastic elastomer nanocompositesThe effect of carbon nanotube aspect ratio (AR) on the percolation characteristics of their polymer composites was investigated by melt blending the multi-wall carbon nanotubes (MWCNTs) with different AR with a thermoplastic elastomer. Previously, most studies reported the effect of aspect ratio of MWCNTs only in the context of achieving the maximum electrical conductivity at lower percolation thresholds in the polymer composites. In this study, our results indicate that aspect ratio can also influence other percolation properties such as the pre-percolation conductivity, percolation conductivity and post-percolation conductivity, shape of the percolation curve, and the width of the insulator-conductor transition. We have established that AR can be used to tailor the percolation curves from sharp to quasi-linear ones, which can help us fabricate the percolative composites with stable electrical properties. Experimental results suggested that the mathematically calculated nominal AR of the MWCNTs was an unclear parameter to correlate with the percolation characteristics of the composites. Instead, an approach taking into consideration the nominal length (l) and the diameter (d) of the MWCNTs individually rather than as a combined AR (l/d) parameter gave a better explanation of the relation between MWCNT dimensions and percolation characteristics. V C 2014 AIP Publishing LLC. [http://dx.

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The effect of aspect ratio on the piezoresistive behavior of the multiwalled carbon nanotubes/thermoplastic elastomer nanocomposites

Cited by 30 publications

References 30 publications

Tailoring electrical and thermal properties of polymethyl methacrylate‐carbon nanotubes composites through polyaniline and dodecyl benzene sulphonic acid impregnation

Tailoring electrical and thermal properties of polymethyl methacrylate‐carbon nanotubes composites through polyaniline and dodecyl benzene sulphonic acid impregnation

Aligned carbon nanotube sheet piezoresistive strain sensors

Influence of carbon nanotube dimensions on the percolation characteristics of carbon nanotube/polymer composites

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