A Surface-Confined Gradient Conductive Network Strategy for Transparent Strain Sensors toward Full-Range Monitoring

2021 ◽  
Author(s):  
Xiubin Xu ◽  
Rui Chen ◽  
Yunlong Li ◽  
Danfeng Yu ◽  
Junmin Chen ◽  
...  
Keyword(s):  
Full Range ◽  
Strain Sensors ◽  
Conductive Network

scholarly journals Anisotropic, Wrinkled, and Crack-Bridging Structure for Ultrasensitive, Highly Selective Multidirectional Strain Sensors

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Heng Zhang ◽  
Dan Liu ◽  
Jeng-Hun Lee ◽  
Haomin Chen ◽  
Eunyoung Kim ◽  
...  
Keyword(s):  
Rational Design ◽  
Full Range ◽  
Human Motion ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Wearable Electronics ◽  
Trade Off ◽  
Human Motion Detection ◽  
Sensing Applications ◽  
Anisotropic Structures

AbstractFlexible multidirectional strain sensors are crucial to accurately determining the complex strain states involved in emerging sensing applications. Although considerable efforts have been made to construct anisotropic structures for improved selective sensing capabilities, existing anisotropic sensors suffer from a trade-off between high sensitivity and high stretchability with acceptable linearity. Here, an ultrasensitive, highly selective multidirectional sensor is developed by rational design of functionally different anisotropic layers. The bilayer sensor consists of an aligned carbon nanotube (CNT) array assembled on top of a periodically wrinkled and cracked CNT–graphene oxide film. The transversely aligned CNT layer bridge the underlying longitudinal microcracks to effectively discourage their propagation even when highly stretched, leading to superior sensitivity with a gauge factor of 287.6 across a broad linear working range of up to 100% strain. The wrinkles generated through a pre-straining/releasing routine in the direction transverse to CNT alignment is responsible for exceptional selectivity of 6.3, to the benefit of accurate detection of loading directions by the multidirectional sensor. This work proposes a unique approach to leveraging the inherent merits of two cross-influential anisotropic structures to resolve the trade-off among sensitivity, selectivity, and stretchability, demonstrating promising applications in full-range, multi-axis human motion detection for wearable electronics and smart robotics.

Electromechanical Characterization of an Innovative Painted Carbon Nanotube Strain Sensor Under Dynamic Loading

2018 ◽  
Author(s):  
Erika Magnafico ◽  
Arnaldo Casalotti ◽  
Giulia Lanzara
Keyword(s):  
Dynamic Loading ◽  
Mechanical Strain ◽  
Great Sensitivity ◽  
Strain Sensors ◽  
Conductive Network ◽  
Electromechanical Properties ◽  
Low Weight ◽  
Sensitive Coating ◽  
Dynamic Loading Conditions

Piezoresistive strain sensors can be manufactured by embedding carbon nanotubes (CNTs) in an insulating polymer matrix, by taking advantage of CNTs superior electromechanical properties. In particular, the electromechanical properties find their roots in the conductive network formed by the randomly dispersed CNTs, through which the current can flow. When a mechanical strain occurs the conductive network configuration varies, changing the overall material conductivity. In this study this concept is being exploited to form a CNTs-based functional paint that allows to monitor ultra-large structural areas, in multiple directions, with an easy to assemble and processing approach. In particular, CNTs are dispersed in a PolymethylMethacrylate (PMMA) matrix following a carefully designed process to achieve a proper viscosity for direct painting onto a large in scale structure. Electromechanical tests are performed to characterize the piezoresistive behaviour of the coating in static and dynamic loading conditions. The results showed the great sensitivity of the coating to strain. The proposed approach to directly paint a sensitive coating onto the structure to be monitored has the advantages of: ultra-low weight, direct contact with the structure to be monitored and an extremely simple installation procedure.

scholarly journals Highly Stretchable, Elastic, and Sensitive MXene-Based Hydrogel for Flexible Strain and Pressure Sensors

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Yao Lu ◽  
Xinyu Qu ◽  
Wen Zhao ◽  
Yanfang Ren ◽  
Weili Si ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Full Range ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Poly Vinyl Alcohol ◽  
Wearable Electronics ◽  
Double Network ◽  
Hydrogel Matrix ◽  
Highly Stretchable

Electronic skin is driving the next generation of cutting-edge wearable electronic products due to its good wearability and high accuracy of information acquisition. However, it remains a challenge to fulfill the requirements on detecting full-range human activities with existing flexible strain sensors. Herein, highly stretchable, sensitive, and multifunctional flexible strain sensors based on MXene- (Ti3C2Tx-) composited poly(vinyl alcohol)/polyvinyl pyrrolidone double-network hydrogels were prepared. The uniformly distributed hydrophilic MXene nanosheets formed a three-dimensional conductive network throughout the hydrogel, endowing the flexible sensor with high sensitivity. The strong interaction between the double-network hydrogel matrix and MXene greatly improved the mechanical properties of the hydrogels. The resulting nanocomposited hydrogels featured great tensile performance (2400%), toughness, and resilience. Particularly, the as-prepared flexible pressure sensor revealed ultrahigh sensitivity (10.75 kPa-1) with a wide response range (0-61.5 kPa), fast response (33.5 ms), and low limit of detection (0.87 Pa). Moreover, the hydrogel-based flexible sensors, with high sensitivity and durability, could be employed to monitor full-range human motions and assembled into some aligned devices for subtle pressure detection, providing enormous potential in facial expression and phonation recognition, handwriting verification, healthy diagnosis, and wearable electronics.

A wirelessly multi stimuli-responsive ultra-sensitive and self-healable wearable strain sensor based on silver quantum dots of 3D organo-hydrogel nanocomposites

2021 ◽  
Author(s):  
Hend A. Alkabes ◽  
Samar Elksass ◽  
Khaled E. El-Kelany ◽  
Maged El-Kemary
Keyword(s):  
Quantum Dots ◽  
Human Activities ◽  
Full Range ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Stimuli Responsive ◽  
Hydrogel Nanocomposites ◽  
Enhanced Properties

Novel multifunctional flexible strain sensors with enhanced properties have become an urgent requirement to comprehensively study the challenges of monitoring the full-range of human activities.

scholarly journals Skin inspired fractal strain sensors using a copper nanowire and graphite microflake hybrid conductive network

Nanoscale ◽  
2016 ◽  
Vol 8 (37) ◽  
pp. 16596-16605 ◽  
Author(s):  
Naveen N. Jason ◽  
Stephen J. Wang ◽  
Sushrut Bhanushali ◽  
Wenlong Cheng
Keyword(s):  
Strain Sensors ◽  
Conductive Network ◽  
Copper Nanowire

Flexible Superamphiphobic Film with a 3D Conductive Network for Wearable Strain Sensors in Humid Conditions

2022 ◽  
Author(s):  
Ya-Ru Ding ◽  
Chao-Hua Xue ◽  
Xiao-Jing Guo ◽  
Xue Wang ◽  
Shun-Tian Jia ◽  
...  
Keyword(s):  
Strain Sensors ◽  
Conductive Network

Carbonized silk georgette as an ultrasensitive wearable strain sensor for full-range human activity monitoring

2017 ◽  
Vol 5 (30) ◽  
pp. 7604-7611 ◽  
Author(s):  
Chunya Wang ◽  
Kailun Xia ◽  
Muqiang Jian ◽  
Huimin Wang ◽  
Mingchao Zhang ◽  
...  
Keyword(s):  
Human Activity ◽  
Full Range ◽  
Strain Sensor ◽  
Activity Monitoring ◽  
Strain Sensors ◽  
Human Motions

Silk georgette based wearable strain sensors are developed, which exhibit outstanding performance and great potential in monitoring full-range human motions.

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