Ultrasensitive piezoresistive strain sensors based on CNTs/Ag-NPs coated highly stretchable textile

Textiles have emerged as a promising class of materials for developing wearable robots that move and feel like everyday clothing. Textiles represent a favorable material platform for wearable robots due to their flexibility, low weight, breathability, and soft hand‐feel. Textiles also offer a unique level of programmability because of their inherent hierarchical nature, enabling researchers to modify and tune properties at several interdependent material scales. With these advantages and capabilities in mind, roboticists have begun to use textiles, not simply as substrates, but as functional components that program actuation and sensing. In parallel, materials scientists are developing new materials that respond to thermal, electrical, and hygroscopic stimuli by leveraging textile structures for function. Although textiles are one of humankind's oldest technologies, materials scientists and roboticists are just beginning to tap into their potential. This review provides a textile‐centric survey of the current state of the art in wearable robotic garments and highlights metrics that will guide materials development. Recent advances in textile materials for robotic components (i.e., as sensors, actuators, and integration components) are described with a focus on how these materials and technologies set the stage for wearable robots programmed at the material level.

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“…[ 467 ] Other researchers have produced similar sensors by coating pre‐strained knits with Ag nanoparticles, CNTs, and PPy. [ 460,468 ]…”

Section: Textile Sensors For Wearable Robotsmentioning

confidence: 99%

Textile Technology for Soft Robotic and Autonomous Garments

Sánchez¹,

Walsh²,

Wood³

2020

Adv Funct Materials

180

123

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“…[48][49][50] Meanwhile, the smart strain-sensing bilayer design is also distinct with the integration of multicomponents/structures (e.g., different dimensions of conductive nanomaterials) to yield a hybrid strain-sensing singlelayer. 23,30,[51][52][53] Additionally, the as-wrinkled CNT interlayer may act as a mechanical buffer layer 25 to alleviate the mechanical mismatch between the rigid Ag NP layer and the elastic PDMS ber, preventing the Ag NP layer from delaminating.…”

Section: Resultsmentioning

confidence: 99%

“…2,3,19,30,32,38,47 On the other hand, several strategies have been developed to improve the stretchability of strain sensors, e.g., introduction of one-dimensional (1D) or two-dimensional (2D) conductive nanomaterials into the strainsensing layer and/or design of stretchable surface structures (e.g., wrinkling structures). [48][49][50][51][52][53] During straining, the slippage of overlapped 1D or 2D nanomaterials in the strain-sensing layer can accommodate the loaded strain, endowing the strain sensors with good stretchability, while the sensitivity enhancement is very limited. [48][49][50][51][52][53] Recently, simultaneously introducing multiple conductive nanomaterials with different dimensions in a strain-sensing layer has been recognized to be a useful strategy to further improve the stretchability and sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…[48][49][50][51][52][53] During straining, the slippage of overlapped 1D or 2D nanomaterials in the strain-sensing layer can accommodate the loaded strain, endowing the strain sensors with good stretchability, while the sensitivity enhancement is very limited. [48][49][50][51][52][53] Recently, simultaneously introducing multiple conductive nanomaterials with different dimensions in a strain-sensing layer has been recognized to be a useful strategy to further improve the stretchability and sensitivity. Owing to the fact that conductive multi-components are basically integrated to yield a hybrid strain-sensing single-layer with robust conductive networks, the sensitivity enhancement is still limited.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the fact that conductive multi-components are basically integrated to yield a hybrid strain-sensing single-layer with robust conductive networks, the sensitivity enhancement is still limited. 23,30,[51][52][53] As for the stress-relief wrinkling structure, it has been widely used to enhance the stretchability of strain sensors because the stored pre-strain in the wavy structure can be gradually released through changes in the wrinkling amplitude/ wavelength to accommodate the applied strain. [48][49][50] In this case, the deformation of the wrinkling structure has no evident effect on the integrity of conductive networks during straining.…”

Section: Introductionmentioning

confidence: 99%

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