Highly sensitive and stretchable piezoresistive strain sensor based on conductive poly(styrene-butadiene-styrene)/few layer graphene composite fiber

Wang, Xingping; Meng, Shaoping; Tebyetekerwa, Mike; Li, Yilong; Pionteck, Jürgen; Sun, Bin; Qin, Zongyi; Zhu, Meifang

doi:10.1016/j.compositesa.2017.11.027

Cited by 184 publications

(162 citation statements)

References 51 publications

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“…[ 32 ] Upon applying a higher tensile strain, the tunnel distance of Gr–Gr became larger and the conductive pathways experienced irreversible destruction, which resulted in the rapid and sharp change of Δ R/R 0 , as shown in Figure 7b,c (red dotted square). [ 5,20 ]…”

Section: Resultsmentioning

confidence: 99%

Highly Stretchable and Sensitive SBS/Graphene Composite Fiber for Strain Sensors

Zhou

Wang

et al. 2020

Macro Materials & Eng

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Flexible strain sensors have attracted tremendous interests due to the emergence of intelligent wearable technology. Electrically conductive fibers are desirable candidates for flexible strain sensors, but up til now, there still exist enormous challenges to obtain conductive fibers exhibiting simultaneously high stretchability and high strain sensitivity. This paper introduces a poly (styrene‐butadiene‐styrene) (SBS)/graphene (Gr) composite fiber‐based flexible strain sensor fabricated by a facile and highly scalable wet spinning method. The results demonstrate that the graphene content has significant influence on the morphology, mechanical properties, and electromechanical properties of the composite fibers. The fibers with 5 wt% graphene have a wide response range of up to 100% strain, a high electrical sensitivity with the gauge factor of 10083.98 at 100% strain, and meanwhile, a high level of stability for 2100 stretching–releasing cycles under an applied strain of 20%. Furthermore, the SBS‐5%Gr composite fibers display excellent sensing performance in detecting human upper limb movements at different joints including hand joints, wrist joints, elbow joints, and shoulder joints.

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Section: Resultsmentioning

confidence: 99%

Highly Stretchable and Sensitive SBS/Graphene Composite Fiber for Strain Sensors

Zhou

Wang

et al. 2020

Macro Materials & Eng

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“…Therefore, all of the SCGFs present good tensile mechanical properties and the elongation at break are all more than 700%, which meets the tensile performance requirements of strain sensors under large deformation. Moreover, the mechanical property of SBS/ 0.5C/2.5G is better than SBS/3CNT and SBS/3FLG [14,15], which could be attributed to a synergistic effect between one-dimensional CNTs and two-dimensional FLG at this ratio, promoting uniform dispersion in the polymer matrix.…”

Section: Mechanical Behaviors Of Scgfsmentioning

confidence: 93%

“…The SBS/CNTs/FLG composite fibers (SCGFs) were fabricated by a facile and scalable wet-spinning process [14,15]. First, a certain proportion of CNTs and FLGs were added into tetrahydrofuran solution for a further ultrasonic of 4 h in a 20°C water bath to obtain a dispersed mixed solution.…”

Section: Preparation Of Sbs/cnts/flg Composite Fibersmentioning

confidence: 99%

“…The changes in fiber resistance were measured under different tensile strain rates, tensile strain amplitudes and tensile cycles. The specific operation was described according to our previous work [14,15].…”

Section: Characterizationmentioning

confidence: 99%

“…In most cases, the deterioration of durability is relevant to the irreversible deformation of the flexible matrix, the fracture of conductive network and weak interaction between polymer and conductive fillers [11][12][13]. Aiming at the problems above, we recently prepared strain sensors based on poly(styrene-butadiene-styrene) (SBS)/carbon nanotubes (CNTs) and SBS/few-layer graphene (FLG) conductive fibers, which possessed large deformation, high sensitivity and good cycle stability under small deformation (<50%) [14,15]. Unfortunately, the dynamic stabilities of these hybrid conductive fibers is low under large deformation (>100%), which limited their application in the fields of human motion detection and smart wearable devices.…”

Section: Introductionmentioning

confidence: 99%

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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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Tuning Mechanical and Electrical Properties of Elastomer Composites with Hybrid Filler Network Containing Graphene for Stretchable Strain Sensors

Sang

Chen

et al. 2021

Adv Eng Mater

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Conductive elastomer composites (CECs) with segregated filler networks display a combination of good mechanical properties and electrical conductivity, enabling potential applications in flexible and stretchable electronics. However, it is challenging to achieve high strain sensitivity and to retain good elasticity. Here, hybrid fillers of carbon nanostructures (CNS, also known as branched carbon nanotubes) and graphene are used to achieve high strain sensitivity of thermoplastic polyurethane (TPU)‐based CECs without decreasing elasticity and electrical conductivity. By changing the graphene type, namely, single layer graphene nanosheet (GNS) and graphene nanoplatelets (GNP), mechanical properties and strain–sensing performances of the CECs can be modulated effectively at proper hybrid filler compositions. Due to the effect of graphene morphology, the TPU/CNS–GNP system has higher strain sensitivity by comparison with the TPU/CNS–GNS system. These CECs demonstrate potential applications as flexible/wearable electronics in body joint bending and flexible switches and resistors for current regulation.

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Highly sensitive and stretchable piezoresistive strain sensor based on conductive poly(styrene-butadiene-styrene)/few layer graphene composite fiber

Cited by 184 publications

References 51 publications

Highly Stretchable and Sensitive SBS/Graphene Composite Fiber for Strain Sensors

Highly Stretchable and Sensitive SBS/Graphene Composite Fiber for Strain Sensors

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

Tuning Mechanical and Electrical Properties of Elastomer Composites with Hybrid Filler Network Containing Graphene for Stretchable Strain Sensors

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