Highly sensitive and flexible piezoresistive sensor based on c-MWCNTs decorated TPU electrospun fibrous network for human motion detection

Li, Siming; Li, Ruiqing; González, Orianaisy Gelis; Chen, Tianjiao; Xiao, Xueliang

doi:10.1016/j.compscitech.2020.108617

Cited by 112 publications

(68 citation statements)

References 54 publications

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“…Therefore, the sensor with a larger pore size has better piezoresistive properties. As shown in Figure 3g, the piezoresistive properties of the SF-CNTs@SEBS with different diameters (12,16, and 20 mm) were analyzed. The sensitivity increases with the increase in the diameter in the three sensing units, and the sensor with 20 mm diameter presents the highest sensitivity of 139.76 kPa À1 (0-250 Pa).…”

Section: Resultsmentioning

confidence: 99%

“…Benefiting from the 3D network structure, the tensile strain sensing performance of the sensor with network structure is better than that of the sensor without network structure (0 Â 0 mm 2 pore size). The tensile-electrical properties of the SF-CNTs@SEBS with different diameters (12,16, and 20 mm) were measured, as shown in Figure 2g. As the diameter is reduced, the GF value decreases, and the sensor with 20 mm diameter presents the highest GF value of 7.01.…”

Section: Resultsmentioning

confidence: 99%

“…The flexible piezoresistive sensors are widely used in electronic skins, [1][2][3][4][5][6] soft robotics, [7][8][9] wearable health-monitoring devices, [10][11][12][13][14] and interactive input/control devices [15,16] because of their easy signal collection, cost-efficient fabrication, and sensitivity to both flexion and pressure. [17][18][19][20] The structure of the sensing unit is the key factor affecting the properties of the flexible piezoresistive sensor, [21] which can be divided into 1D structure, 2D structure, and 3D structure.…”

Section: Introductionmentioning

confidence: 99%

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A 3D‐Printed, Sensitive, Stable, and Flexible Piezoresistive Sensor for Health Monitoring

Xia

et al. 2021

Adv Eng Mater

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The flexible piezoresistive sensors have great potentials in wearable electronics. Sensitivity and stability are the key parameters for the piezoresistive sensors. However, the 3D flexible piezoresistive sensors are difficult to meet high sensitivity and good stability simultaneously. Herein, combining 3D printing with a carbon nanotubes (CNTs) surface‐filled (SF) structure that CNTs are filled in the surface of styrene–ethylene–butylene–styrene (SEBS) substrate, a highly sensitive, stable, and flexible piezoresistive sensor is developed. Experimental results show that the CNTs SF sensor not only has high sensitivity similar to the CNTs surface‐coated sensor, but also has good stability similar to the CNTs integral‐filled sensor. Due to the 3D network structure and SF CNTs conductive layer, the sensor shows high stretchability of 20.9 times, good sensitivity of 161.53 kPa−1 at an applied pressure <250 Pa under compressed status, high gauge factor of 7.24 under stretched status, excellent stability (>2000 cycles), the short mechanical response time (149 ms) and recovery time (75 ms). Meantime, the sensor shows an obvious response to temperature. Furthermore, the sensor is used to detect tiny and big human activities such as speaking, throat swallowing, and breathing, exhibiting its great potential for application in wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A 3D‐Printed, Sensitive, Stable, and Flexible Piezoresistive Sensor for Health Monitoring

Xia

et al. 2021

Adv Eng Mater

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“…TPU is a highly resilient thermoplastic material and commonly used to produce flexible composites. [25][26][27] In this study, a TPU blend and carbon fiber tows are combined into compound carbon fibers, which are then fabricated into knitted composites. Afterward, the carbon fiber knitted composites are laminated and hot pressed.…”

Section: Resultsmentioning

confidence: 99%

Extrusion/hot pressing processing and laminated layers of continuous carbon fiber/thermoplastic polyurethane knitted composites

Lin

Bao

2021

Polymer International

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Extrusion is employed to combine carbon fiber tows and thermoplastic polyurethane (TPU) blend. TPU-cladded carbon fibers undergo knitting to form carbon fiber knitted composites. Microscopic observation proves that the compound carbon fibers are composed of a double-layered structure with interfacial bonding and fiber axial alignment. In addition, the TPU coating can reduce friction during knitting, which provides the carbon fiber knitted composites with flexibility and resilience. Regarding the mechanical properties, the tensile strength is in direct proportion to the number of lamination layers. In particular, sixlayered knitted composites exhibit an optimal tensile strength of 43.72 MPa, whereas four-layered knitted composites exhibit optimal tensile elongation. Through the manufacturing and evaluations in this study, continuous carbon fibers can be fabricated via extrusion, thereby obtaining a knitted structure that can be laminated to strengthen the mechanical properties and electromagnetic interference shielding efficacy of the laminated composites. Large composites can also be achieved, which overcomes the limits of continuous carbon fibers in subsequent production.

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“…Similarly, sandwiching the conductive TPU electrospun fibrous network/MWCNTs and a polyimide (PI) sheet patterned with gold electrodes between two dielectric polymer layers. A sandwich type pressure sensor affords high sensitivity (2 kPa −1 ), pressure sensing range (10 kPa), along with the low hysteresis deviation (6%) [239]. More recently, Liang et al fabricated all nanofibrous composed piezoresistive pressure and strain sensors with a higher sensitivity of about 71.07 kPa −1 , and it also offered good clinical health monitoring with a better distinction among the atrial contraction, right ventricular contraction, atrial venous filling, atrium relaxation, and tricuspid valve opening [240].…”

Section: Nanofiber Sensorsmentioning

confidence: 99%

Recent Progress in Conducting Polymer Composite/Nanofiber-Based Strain and Pressure Sensors

et al. 2021

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The Conducting of polymers belongs to the class of polymers exhibiting excellence in electrical performances because of their intrinsic delocalized π- electrons and their tunability ranges from semi-conductive to metallic conductive regime. Conducting polymers and their composites serve greater functionality in the application of strain and pressure sensors, especially in yielding a better figure of merits, such as improved sensitivity, sensing range, durability, and mechanical robustness. The electrospinning process allows the formation of micro to nano-dimensional fibers with solution-processing attributes and offers an exciting aspect ratio by forming ultra-long fibrous structures. This review comprehensively covers the fundamentals of conducting polymers, sensor fabrication, working modes, and recent trends in achieving the sensitivity, wide-sensing range, reduced hysteresis, and durability of thin film, porous, and nanofibrous sensors. Furthermore, nanofiber and textile-based sensory device importance and its growth towards futuristic wearable electronics in a technological era was systematically reviewed to overcome the existing challenges.

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Highly sensitive and flexible piezoresistive sensor based on c-MWCNTs decorated TPU electrospun fibrous network for human motion detection

Cited by 112 publications

References 54 publications

A 3D‐Printed, Sensitive, Stable, and Flexible Piezoresistive Sensor for Health Monitoring

A 3D‐Printed, Sensitive, Stable, and Flexible Piezoresistive Sensor for Health Monitoring

Extrusion/hot pressing processing and laminated layers of continuous carbon fiber/thermoplastic polyurethane knitted composites

Recent Progress in Conducting Polymer Composite/Nanofiber-Based Strain and Pressure Sensors

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