A graphite nanoplatelet-based highly sensitive flexible strain sensor

Xu, Jü; Wang, Huatao; Ma, Tiantian; Wu, Yajin; Xue, Rui; Cui, Hongxin; Wu, Xulei; Wang, Yu; Huang, Xiaoxiao

doi:10.1016/j.carbon.2020.05.042

Cited by 35 publications

(25 citation statements)

References 61 publications

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“…[ 7,8 ] Among them, the capacitive strain sensors exhibit superior properties in terms of high linearity, low hysteresis, and low energy consumption, making them have great advantages for the use in wearable devices and in smart soft robots. [ 9–19 ]…”

Section: Introductionmentioning

confidence: 99%

“…developed a capacitive strain sensor with a negative GF of ≈3.5 based on graphite nanoplatelets/polyurethane (GNPs/PU) composite electrodes, which significantly relied on the flaky GNPs in electrodes sharing longer distance after stretching. [ 18 ] Recently, Nur et al. reported a capacitive strain sensor with high sensitivity by using ultrathin gold film and a wrinkled 3M VHB tape.…”

Section: Introductionmentioning

confidence: 99%

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A Super‐Stretchable and Highly Sensitive Carbon Nanotube Capacitive Strain Sensor for Wearable Applications and Soft Robotics

Yang

et al. 2021

Adv Materials Technologies

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The study of flexible and stretchable strain sensors is growing rapidly owing to the demands for human motion detection, human–machine interaction, and soft robotics. However, super‐stretchable and highly sensitive strain sensors with high linearity and low hysteresis are especially lacking, which therefore limits the use of soft strain sensors in varied practical applications. The stretchability and sensitivity of the capacitive strain sensor are constrained by the material characteristics and structure of parallel plate capacitor (theoretical gauge factor [GF] is 1). To address these limitations, a super‐stretchable and highly sensitive capacitive strain sensor composed of two strips of wrinkled carbon nanotubes‐based electrodes separated by a tape dielectric, is presented. By integrating nanomaterials and wrinkled film structure, this device achieves a GF of 2.07 at 300% strain with excellent linearity and negligible hysteresis. This is the first type of capacitive strain sensors that can achieve super‐stretchability and sensitivity simultaneously. Additionally, the sensor has a fast signal response time of ≈80 ms, and good mechanical durability during 1000 stretching and releasing cycles. The authors demonstrate the use of this sensor as a versatile wearable device for human motion tracking, and as a smart real‐time monitoring device for soft pneumatic robots.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Super‐Stretchable and Highly Sensitive Carbon Nanotube Capacitive Strain Sensor for Wearable Applications and Soft Robotics

Yang

et al. 2021

Adv Materials Technologies

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“…The capacitance characteristics of the capacitive sensors are closely related with the surface resistance of the electrodes. [ 48,49 ] Capacitance of the capacitive sensor was found to increase with decreasing surface resistance under compression. Therefore, porous electrode layers further boosted the change in capacitance.…”

Section: Resultsmentioning

confidence: 99%

Seamless Monolithic Design for Foam Based, Flexible, Parallel Plate Capacitive Sensors

Çiçek

Doğanay

Durukan

et al. 2021

Adv Materials Technologies

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range, low power consumption, cycling stability and fast response make capacitive sensors promising candidates for wearable electronics. [27][28][29][30] It was demonstrated that the capacitive pressure sensors can be attached or carried by the human body for human-machine interface. Alternatively, they can be used for collecting physiological signals for real-time healthcare monitoring. However, commercialized or recently developed capacitive pressure sensors are mainly composed of planar separate electrodes, [31,32] which lead to user movement restriction and aesthetic loss. In addition, rigid planar structure restricts the breathability of the body and disrupts user comfort during long periods of use. Wearable capacitive pressure sensors are desired to be designed as a comfortable platform while providing high sensitivity with a low-pressure detection ability and long-term durability. They should also minimize additional weight and physical constraints on the human body in motion.Improvement of the sensitivity of capacitive pressure sensors is achieved by various strategies. These include the use of micropatterned dielectric layers or electrode surfaces, [31] nanofibrous membranes, [6,33] dielectric layers with microspheres [34,35] and ionic-liquid active dielectric layers. [36][37][38] The capacitive pressure sensors based on micro/nano patterned or ionic-liquid activated structures show promising sensitivity and quick response to external stimuli. These methods are time consuming, expensive and involve complicated production steps, such as electrospinning, etching and photolithography. Alternatively, foam-like structures with a wide variety of polymeric materials like polyelefin, [39] polyurethane, [40] ecoflex, [41] and polydimethylsiloxane (PDMS) [42] can be used in wearable electronics. They are cost-effective, commercially available and can be used for large scale-fabrication. Porous structure of these dielectric layers allows capacitive pressure sensors to detect low-pressures and have high sensitivity. For example, Teo and co-workers have demonstrated a capacitive pressure sensor with a dielectric layer made by boron nitride/PDMS foam and verified that 3D network structure can detect very low-pressures (<1 Pa). [42] Park and co-workers have showed a capacitive pressure sensor from 3D microporous dielectric layer sandwiched between carbon nanotube -ecoflex electrode layers with a Capacitive pressure sensors received significant attention in line with advancements in wearable electronics. However, in the era of the wearable electronics, fabricated sensors fail to fulfill the absolute requirements. Significant portion of the previously reported capacitive pressure sensors suffer from excessive weight, lack of air permeability, and washing stability due to the use of separate electrode layers. A low-cost, lightweight, parallel plate capacitive sensor with a unique seamless monolithic design that allows sensors to circumvent aforementioned problems is hereby demonstrated. The seamless monolithic capacitive ...

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“…These devices can function on different sensing principles, with mechanisms based on capacitance [3][4][5], resistance [6,7], piezoelectrics/triboelectrics [8,9], and transistors [10,11], and with example applications in the areas of biomechanical engineering [12,13], wearable sensors [14,15], and structural health monitoring [16,17]. Flexible sensors can be fabricated using conductive polymers [18,19] and silicone [20,21], sometimes doping the matrix with nanoparticles [22][23][24][25], to improve on electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Soft Elastomeric Capacitor for Angular Rotation Sensing in Steel Components

Liu

Laflamme

et al. 2021

Sensors

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The authors have previously proposed corrugated soft elastomeric capacitors (cSEC) to create ultra compliant scalable strain gauges. The cSEC technology has been successfully demonstrated in engineering and biomechanical applications for in-plane strain measurements. This study extends work on the cSEC to evaluate its performance at measuring angular rotation when installed folded at the junction of two plates. The objective is to characterize the sensor’s electromechanical behavior anticipating applications to the monitoring of welded connections in steel components. To do so, an electromechanical model that maps the cSEC signal to bending strain induced by angular rotation is derived and adjusted using a validated finite element model. Given the difficulty in mapping strain measurements to rotation, an algorithm termed angular rotation index (ARI) is formulated to link measurements to angular rotation directly. Experimental work is conducted on a hollow structural section (HSS) steel specimen equipped with cSECs subjected to compression to generate angular rotations at the corners within the cross-section. Results confirm that the cSEC is capable of tracking angular rotation-induced bending strain linearly, however with accuracy levels significantly lower than found over flat configurations. Nevertheless, measurements were mapped to angular rotations using the ARI, and it was found that the ARI mapped linearly to the angle of rotation, with an accuracy of 0.416∘.

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A graphite nanoplatelet-based highly sensitive flexible strain sensor

Cited by 35 publications

References 61 publications

A Super‐Stretchable and Highly Sensitive Carbon Nanotube Capacitive Strain Sensor for Wearable Applications and Soft Robotics

A Super‐Stretchable and Highly Sensitive Carbon Nanotube Capacitive Strain Sensor for Wearable Applications and Soft Robotics

Seamless Monolithic Design for Foam Based, Flexible, Parallel Plate Capacitive Sensors

Soft Elastomeric Capacitor for Angular Rotation Sensing in Steel Components

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