Highly linear and low hysteresis porous strain sensor for wearable electronic skins

Xia, Quanjun; Wang, Shuo; Zhai, Wei; Shao, Chunguang; Xu, Ling; Yan, Ding‐Xiang; Yang, Ning; Dai, Kun; Liu, Chuntai; Shen, Changyu

doi:10.1016/j.coco.2021.100809

Cited by 42 publications

(29 citation statements)

References 41 publications

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“…Achieving high linearity is also of great significance for accurate and reliable real-time detection of strain sensors . The coefficient of determination ( R 2 ) was calculated to characterize the linearity of strain sensors (Figure S8b).…”

Section: Resultsmentioning

confidence: 99%

“…Achieving high linearity is also of great significance for accurate and reliable real-time detection of strain sensors. 46 The coefficient of determination (R 2 ) was calculated to characterize the linearity of strain sensors (Figure S8b). When stretched, the tightly connected conductive nanofibers became loose, resulting in a gradual increase in resistance, so that the PCNF-3 (T) sensor showed a good GF of 0.73 with high linearity (R 2 of 0.998) over a strain range of 0.1% to 11%.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Highly Aligned Cellulose/Polypyrrole Composite Nanofibers via Electrospinning and In Situ Polymerization for Anisotropic Flexible Strain Sensor

Song

et al. 2023

ACS Appl. Mater. Interfaces

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Flexible strain sensors have recently attracted great attention due to their promising applications in human motion detection, healthcare monitoring, human–machine interfaces, and so forth. However, traditional uniaxial strain sensors can only detect strain in a single direction. Herein, an anisotropic flexible strain sensor is fabricated based on conductive and highly aligned cellulose composite nanofibers, via facile electrospinning cellulose acetate, deacetylation, and in situ polymerization of pyrrole, to detect complex multidimensional strains. Benefiting from the unique well-ordered structure of conductive composite nanofibers, the obtained strain sensor shows extraordinary anisotropic sensing performance with a sensitivity of 0.73 and 0.01 for the tensile applied perpendicular and parallel to the nanofiber alignment, respectively. The sensor also exhibits outstanding durability (2000 cycles) due to the strong hydrogen bonding between cellulose nanofibers and polypyrrole. Moreover, the flexible strain sensors exhibit promising potentials for application in motion detection, as demonstrated by the detection of various joint movements in the human body.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Highly Aligned Cellulose/Polypyrrole Composite Nanofibers via Electrospinning and In Situ Polymerization for Anisotropic Flexible Strain Sensor

Song

et al. 2023

ACS Appl. Mater. Interfaces

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“…For human‐machine interfaces, wearable sensors are expected to connect with human skin or various substrates and realize human‐motion detection. [ 30,41 ] Intriguingly, the ICFE has outstanding adhesive capacities, which is capable of being adhered tightly to both hydrophobic and hydrophilic substrate surfaces of silicone rubber, stainless steel, polytetrafluoroethylene (PTFE), ceramic, rubber, and wood (Figure S20a, Supporting Information). Besides, the ICFE exhibits an impressive adhesive ability on the skin of a volunteer without any residue when being peeled off (Figure S20b, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

A Waterproof Ion‐Conducting Fluorinated Elastomer with 6000% Stretchability, Superior Ionic Conductivity, and Harsh Environment Tolerance

Shi

Wang

Wan

et al. 2022

Adv Funct Materials

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The development of ionic conductors with extreme stretchability, superior ionic conductivity, and harsh‐environment resistance is urgent while challenging because the tailoring of these performances is mutually exclusive. Herein, a hydrophobicity‐constrained association strategy is presented for fabricating a liquid‐free ion‐conducting fluorinated elastomer (ICFE) with microphase‐separated structures. Hydrophilic nanodomains with long‐range ordering and selectively enriched Li ions provided high‐efficient conductive pathways, yielding impressive room‐temperature ionic conductivity of 3.5 × 10–3 S m–1. Hydrophobic nanodomains with abundant and reversible hydrogen bonds endow the ICFE with superior damage‐tolerant performances including ultrastretchability (>6000%), large toughness (17.1 MJ m–3) with notch insensitivity, antifatigue ability, and high‐efficiency self‐healability. Due to its liquid‐free characteristic and surface‐enriched hydrophobic nanodomains, the ICFE demonstrates an extreme temperature tolerance (−20 to 300 °C) and unique underwater resistance. The resultant ICFE is assembled into a proof‐of‐concept skin‐inspired sensor, showing impressive capacitive sensing performance with high sensitivity and wide‐strain‐range linearity (gauge factor to 1.0 in a strain range of 0–350%), excellent durability (>1000 cycles), and unique waterproofness in monitoring of complex human motions. It is believed that the hydrophobicity‐constrained association method boosts the fabrication of stretchable ionic conductors holding a great promise in skin‐inspired ionotronics with harsh‐environment tolerance.

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“…Conductive nanomaterials are usually self-assembled or mixed with polymers to form conductive networks within these 3D frameworks. Therefore, the composite foams exhibit a stable piezoresistive effect by combining the compressive elasticity of the foam scaffold and the electrical conductivity of the nanomaterial coatings, and can be used as one of the key materials of compressive strain sensors [2,3]. However, it remains a challenge to achieve the requirements of high sensitivity, large linearity and excellent response stability at the same time, which greatly limits their application in intelligent electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Compressive Strain Sensing Elastic Foam Based on Sericin Dispersed Carbon Nanotubes

Xiao

Jiang

et al. 2023

J. Phys.: Conf. Ser.

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The flexible strain sensor can transform the micro or macro deformation into the visual electrical signals for monitoring the physiological and motor characteristics of human body. However, the current commercial strain sensors generally have some shortcomings such as large stiffness and small strain range. In this work, a flexible compressive strain sensor with the 3D conductive network was fabricated by using biomacromolecule sericin protein dispersed carbon nanotubes (SSCNTs) as the conductive material and melamine foam (MF) as the elastic matrix. The results showed that the sensitivity of MF/SSCNTs elastic foam was 1.36 in the strain range of 0-70% with the CNTs content of 10 wt% and the cyclic compressive sensing performance was stable for at least 1600 cycles. This kind of flexible compressive strain sensor is environmentally friendly, low cost, simple process, and provides a new method for the preparation of green flexible sensor.

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Highly linear and low hysteresis porous strain sensor for wearable electronic skins

Cited by 42 publications

References 41 publications

Highly Aligned Cellulose/Polypyrrole Composite Nanofibers via Electrospinning and In Situ Polymerization for Anisotropic Flexible Strain Sensor

Highly Aligned Cellulose/Polypyrrole Composite Nanofibers via Electrospinning and In Situ Polymerization for Anisotropic Flexible Strain Sensor

A Waterproof Ion‐Conducting Fluorinated Elastomer with 6000% Stretchability, Superior Ionic Conductivity, and Harsh Environment Tolerance

Compressive Strain Sensing Elastic Foam Based on Sericin Dispersed Carbon Nanotubes

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