The resistivity–strain behavior of conductive polymer composites: stability and sensitivity

Duan, Lingyan; Fu, Sirui; Deng, Hua; Zhang, Qin; Wang, Ke; Chen, Feng; Fu, Qiang

doi:10.1039/c4ta03645j

Cited by 205 publications

(184 citation statements)

References 64 publications

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“…Electrical conduction in CPCs is generally described by a classical electrical percolation theory, while the dynamic process of conductive network evolution is usually ignored. Some previous studies carried out real‐time tracing of the dependence of electrical properties on processing and phase transitions of CPCs to better understand dynamic percolation behaviour and conductive network formation. Hilarius et al .…”

Section: Introductionmentioning

confidence: 99%

Effect of phase transitions on the electrical properties of polymer/carbon nanotube and polymer/graphene nanoplatelet composites with different conductive network structures

Xiang

Wang

Tang

et al. 2017

Polymer International

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Multi‐walled carbon nanotube (MWCNT)‐ and graphene nanoplatelet (GNP)‐filled high‐density polyethylene (HDPE) composites with dispersed and segregated network structures were prepared by solution‐assisted mixing. Simultaneous DC conductivity and differential scanning calorimetry were used to measure electrical conductivity during composite thermal phase transitions. It was found that the conductive network is deformed during melting and rebuilt again during annealing due to the re‐agglomeration of nanofillers. The rebuilding of the structure is significantly affected by the original network structure and by the shape and loading of the nanofillers. Both deformation and reorganization of the network lead to drastic changes in the conductivity of the composites. The crystallization process also affects the conductive network to some extent and the subsequent volume shrinkage of the polymeric matrix after crystallization results in a further decrease in the resistivity of HDPE/GNP composites. Classical electrical percolation theory combined with a kinetic equation is used to describe the conductivity recovery of composites during annealing, and the results are found to be in good agreement with experimental data. © 2017 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Effect of phase transitions on the electrical properties of polymer/carbon nanotube and polymer/graphene nanoplatelet composites with different conductive network structures

Xiang

Wang

Tang

et al. 2017

Polymer International

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“…As shown in Fig. 6b, a higher D/P indicates a more severe attenuation in strain response sensitivity of composite fibers [38]. According to Fig.…”

Section: Effect Of Cnts and Flg Loading On The Strain Sensing Behaviormentioning

confidence: 76%

1-D polymer ternary composites: Understanding materials interaction, percolation behaviors and mechanism toward ultra-high stretchable and super-sensitive strain sensors

Wang

Tebyetekerwa

2019

Sci. China Mater.

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A series of 1-D polymer ternary composites based on poly(styrene-butadiene-styrene) (SBS)/carbon nanotubes (CNTs)/few-layer graphene (FLG) conductive fibers (SCGFs)were prepared via wet-spinning. Employed as ultra-high stretchable and super-sensitive strain sensors, the ternary composite fiber materials' interaction, percolation behaviors and mechanism were systematically explored. The resultant SCGFs-based strain sensors simultaneously exhibited high sensitivity, superior stretchability (with a gauge factor of 5,467 under 600% deformation) and excellent durability under different test conditions due to excellent flexibility of SBS, the synergistic effect of hybrid conductive nanofibers and the strong π-π interaction. Besides, the conductive networks in SBS matrix were greatly affected by the mass ratio of CNTs and FLG, and thus the piezoresistive performances of the strain sensors could be controlled by changing the content of hybrid conductive fillers. Especially, the SCGFs with 0.30 wt.% CNTs (equal to their percolation threshold 0.30 wt.%) and 2.7 wt.% FLG demonstrated the highest sensitivity owing to the bridge effect of FLG between adjacent CNTs. Whereas, the SCGFs with 1.0 wt.% CNTs (higher than their percolation threshold) and 2.0 wt.% FLG showed the maximum strain detection range (600%) due to the welding connection caused by FLG between the contiguous CNTs. To evaluate the fabricated sensors, the tensile and the cyclic mechanical recovery properties of SCGFs were tested and analyzed. Additionally, a theoretical piezoresistive mechanism of the ternary composite fiber was investigated by the evolution of conductive networks according to tunneling theory.

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“…It should be noted that high loadings of conductive fillers are usually required to achieve high electrical conductivity which can degrade the stretchability of the composites and leads to lower processability. Moreover, it was demonstrated that the strain sensitivity of the composites increases upon decreasing the conductive filler content and the highest sensitivity was found to occur at a filler concentration near the percolation threshold . Therefore, the conductivity/sensitivity, stretchability/processability dilemma should be taken into account in the design of conductive polymer composites.…”

Section: Materials Designsmentioning

confidence: 99%

Strategies for Designing Stretchable Strain Sensors and Conductors

Peng

et al. 2020

Adv Materials Technologies

115

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Flexible and stretchable electronics are attracting tremendous attention for their enormous future potential in wearable technologies. Flexible and stretchable sensors and conductors are the key components of wearable devices for potential applications such as human motion detection, human health monitoring, and human–machine interfaces. One critical requirement for them is to show high level of wearability (bendability and stretchability) and meanwhile to retain their functionality and reliability under large mechanical deformation. To this end, a wide range of materials and structural designs are developed to construct these sensors and conductors. Here, the recent advances in the development of new piezoresistive materials and microstructural motifs that endow electronics with flexibility and stretchability are summarized. Challenges and future opportunities are discussed in terms of the multimodal and multidirectional sensing capabilities, the trade‐off between sensitivity/conductivity and stretchability, multifunctionality, linearity (multiple linear region phenomenon), and integration with flexible power and communication devices.

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The resistivity–strain behavior of conductive polymer composites: stability and sensitivity

Cited by 205 publications

References 64 publications

Effect of phase transitions on the electrical properties of polymer/carbon nanotube and polymer/graphene nanoplatelet composites with different conductive network structures

Effect of phase transitions on the electrical properties of polymer/carbon nanotube and polymer/graphene nanoplatelet composites with different conductive network structures

1-D polymer ternary composites: Understanding materials interaction, percolation behaviors and mechanism toward ultra-high stretchable and super-sensitive strain sensors

Strategies for Designing Stretchable Strain Sensors and Conductors

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