Multi-functional and flexible helical fiber sensor for micro-deformation detection, temperature sensing and ammonia gas monitoring

Zhai, Wei; Li, Xinyu; Xia, Quanjun; Zhan, Pengfei; Xu, J.L.; Zheng, Guoqiang; Dai, Kun; Zhang, Zhicheng; Liu, Chuntai; Shen, Changyu

doi:10.1016/j.compositesb.2021.108621

Cited by 41 publications

(31 citation statements)

References 53 publications

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“…The commonly used conductive electrodes for wearable applications are metal (i.e., Cu, Ag), inorganic materials (i.e., carbonaceous materials), and organic materials (i.e., PEDOT, polyaniline). [ 18,22,24,43,56,57 ]…”

Section: Functional Constructing Materialsmentioning

confidence: 99%

Flexible Temperature Sensors Constructed with Fiber Materials

Cai

2022

Adv Materials Technologies

117

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changes in human body temperature are the first medical diagnostic assessment for the recent on-going COVID-19 pandemic. [1,2] Some emotion-related bodily sensations can also be observed by analyzing the subtle change of body temperature. [3] Hence, it is particularly important to real-time detect human body temperature and monitor external environmental temperature change to establish a smart healthcare system and create a comfortable living condition for human beings.Numerous temperature detectors have been developed to detect temperature through certain physical parameter changes, including mercury thermometers, infrared thermometers, and flexible temperature sensors. Specifically, a mercury thermometer can accurately measure the human body temperature based on the principle of heat-expansion and cold-contraction, however, it takes a much longer time to finish the measurement, and the glass maybe easily be broken, which will pollute the environment and pose potential harm risk to the users. An infrared thermometer is a thermometer with a wide range, fast response, and high sensitivity, which infers temperature from the thermal radiation, sometimes called black-body radiation emitted by human beings. Unfavorably, it is prone to be affected by human emissivity and thus the temperature measurement accuracy is always insufficient for practical application. Alternatively, flexible temperature sensors have attracted intense interest due to their favorable proprieties, such as high sensitivity, good accuracy, fast response, and friendly interface. Benefiting from the softness with conformability, flexible temperature sensors can be directly attached to human skin with ease to record both human body temperature and external environmental temperature in a continuous and long-term manner. Flexible temperature sensors are generally divided into thermo-sensitive sensors, thermo-resistive sensors, and thermoelectric sensors according to the change of electrical resistance in conductive materials or change of surface charge in thermoelectric materials. [4,5] Temperature variations can be precisely captured and these timely information are then transmitted to the human nervous system, providing a very useful tool to sense and respond to the environmental or physiological stimuli. Consequently, flexible temperature sensors open up many promising opportunities in emerging personal healthcare, [6,7] electronic skin, [8] artificial intelligence, [5,9] and next-generation smart robots. [10] There are various constructing materials for flexible temperature sensors, such as films, [11] rubbers, [12] hydrogels, [13] and Accurate and real-time detection of human body temperature changes is crucial to understand thermal homeostasis, to access complex health conditions, and to further build a smart healthcare system. Recent years have seen temperature sensors open up many potential applications in electronic skin, artificial intelligence, and next-generation smart robots. Currently, traditional mercury and infrared thermometers are ext...

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Section: Functional Constructing Materialsmentioning

confidence: 99%

Flexible Temperature Sensors Constructed with Fiber Materials

Cai

2022

Adv Materials Technologies

117

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“…Zhai et al proposed a simple strategy to improve the sensitivity and stability of multifunctional pan-RGO–pan-I fibers (CPGPF) by in situ polymerization and ultrasound. 117 CPGPF-based strain sensors have a wide operating range (0.1–150% strain), high sensitivity, good response stability, fast response time/recovery time (100 ms/100 ms), and good durability (up to 1000 cycles). These significant sensing behaviors were related to the special conductive network with a layered structure and the generation of layered cracks.…”

Section: D Stretchable Electronic Devices and Applicationsmentioning

confidence: 99%

Weaving a magnificent world: 1D fibrous electrodes and devices for stretchable and wearable electronics

et al. 2022

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“…Current textile strain sensors are linear, planar, or three‐dimensional (3D), among which 3D fabric strain sensors are thicker and heavier, and are hard to integrate into apparel to achieve wearing comfort. [ 11,30,31 ] Linear resistive strain sensors are based on conductive fibers or yarns, manufactured by using liquid metal (LM) injection, [ 32,33 ] melt‐spinning, [ 34 ] wet‐spinning, [ 18,23,25 ] coating techniques, [ 10,19,20,26,35–37 ] twisting or buckling structure design. [ 4,8,28,38–42 ] LM‐filled hollow fibers could sense up to 140% strain with a GF of 3.4, and they were stable under 3500 stretching cycles at 70% strain.…”

Section: Introductionmentioning

confidence: 99%

“…[ 32,33 ] Conductive melt‐ or wet‐spun composite fiber sensors were reported to sense up to 100% strain with a high GF of 2800, lasting for 100 stretching cycles. [ 18,23,25,34 ] Coating conductive materials onto fibers or yarns through in situ chemical polymerization, [ 35 ] electrophoretic deposition, [ 20 ] dip‐coating, [ 19,36,37 ] roll coating, [ 10 ] and rod coating [ 26 ] is also an effective way to prepare linear resistive strain sensors. They could have a sensing strain range of up to 20–200%, a GF from –0.76 to 13 920, and a stable sensitivity from 1000 to 4500 cycles at 10% strain.…”

Section: Introductionmentioning

confidence: 99%

A Scalable Durable and Seamlessly Integrated Knitted Fabric Strain Sensor for Human Motion Tracking

Zhou

Shen

Yan-pin

et al. 2022

Adv Materials Technologies

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of detecting various physiological signals and motions. They are integrated into or attached to apparel via knitting, [2] embroidery, [3] and pasting [4] to provide a longterm and stable detection of tiny to large deformations without sacrificing comfort and freedom of motion, and thus have great potential in personal health care, [5] sports, [6] rehabilitation, [7] robotics, [8,9] etc. Textile strain sensors are stretchable and sensitive to tiny deformations. Integrating them into apparel while avoiding deformation to maintain sensor accuracy is crucial for practical applications. A textile strain sensor that can be seamlessly integrated into apparel under precise tension is desired.Textile strain sensors are categorized as resistive, [10] capacitive, [11] piezoelectric, [12] triboelectric, [13] and optical. [14] Resistivity is the most adopted strategy due to its facile fabrication and use. [15] The key to developing textile resistive strain sensors is to choose the right materials, assembled structures, and fabrication methods. [16] Textile resistive strain sensors typically consist of conductive materials and stretchable supporting substrates. [17] The conductive materials include carbon nanotubes (CNTs), [18,19] reduced graphene oxide (rGO), [4,8,20] carbon black (CB), [21] conductive polymers (e.g., polypyrrole (PPY), poly(3,4-ethylenedioxythiop hene):poly(styrenesulfonate) (PEDOT:PSS)), [22,23] metal nanoparticles and nanowires. [24,25] The stretchable supporting materials are normally Ecoflex, [26] polydimethylsiloxane (PDMS), [24] polyurethane (PU), [8,18,27] and rubber. [28] Textile resistive strain sensors detect strains by contacting and separating conductive particles, fibers, or yarns to adjust the resistivity. The principles include geometrical transformations, changes in the conductive network, and the formation of cracks or wrinkle microstructures. [29] Textile resistive strain sensors are evaluated in terms of gauge factor (GF), reliable strain range, and stretching cycles. [29] Textile conductivity can be realized in all three textile processes, i.e., fiber spinning, yarn spinning or covering, and fabric forming. Current textile strain sensors are linear, planar, or three-dimensional (3D), among which 3D fabric strain sensors are thicker and heavier, and are hard to integrate into apparel to achieve wearing comfort. [11,30,31] Linear resistive strain sensors are based on conductive fibers or yarns, manufactured by using liquid metal (LM) injection, [32,33] melt-spinning, [34] wet-spinning, [18,23,25] coating techniques, [10,19,20,26,[35][36][37] twisting Textile strain sensors capable of monitoring human physiological signals and activities have great potential in health monitoring and sports. Integrating them into apparel to be wearable, repeatable, and sensitive remains a great challenge, impeding their practical applications. This paper reports a fabric strain sensor that can be seamlessly integrated into various apparel under precise tension through industrial-scale production. A conductive...

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Multi-functional and flexible helical fiber sensor for micro-deformation detection, temperature sensing and ammonia gas monitoring

Cited by 41 publications

References 53 publications

Flexible Temperature Sensors Constructed with Fiber Materials

Flexible Temperature Sensors Constructed with Fiber Materials

Weaving a magnificent world: 1D fibrous electrodes and devices for stretchable and wearable electronics

A Scalable Durable and Seamlessly Integrated Knitted Fabric Strain Sensor for Human Motion Tracking

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