Piezoresistive performance of polymer-based materials as a function of the matrix and nanofiller content to walking detection application

Dios, José Ramón; García‐Astrain, Clara; Gonçalves, Sérgio; Costa, P.; Lanceros‐Méndez, S.

doi:10.1016/j.compscitech.2019.107678

Cited by 49 publications

(72 citation statements)

References 54 publications

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“…As seen in Table 1 , the 0.7 wt% filler loading provides the high σ 0 of 1 S m −1 for the foam B, which ensures stable electrical signals and low‐power consumption for signal collection in practical applications. Meanwhile, foam B with a robust and strong conductive network can sustain linear compressive strains up to 60%, which is much wider than that for other elastomer composite pressure sensors (≤40%) reported in literature 6b,c,10b,12,14a,25a,33. More recently, Dios et al,14a reported on SEBS/CNT composite piezoresistive sensors fabricated via an environmentally friendly method.…”

Section: Resultsmentioning

confidence: 86%

“…Meanwhile, foam B with a robust and strong conductive network can sustain linear compressive strains up to 60%, which is much wider than that for other elastomer composite pressure sensors (≤40%) reported in literature 6b,c,10b,12,14a,25a,33. More recently, Dios et al,14a reported on SEBS/CNT composite piezoresistive sensors fabricated via an environmentally friendly method. Such sensors show a stable G F of 1.4 under large deformation and can be used for walking detection.…”

Section: Resultsmentioning

confidence: 86%

“…Although high sensitivity generally can be achieved at filler loadings slightly above the percolation threshold (ϕ C ), this does not guarantee good electrical conductivity (σ 0 ) for the corresponding composites 32a,28a. In general, a lower σ 0 means a loose conductive network leading to higher sensitivity, but inevitably weak reproducibility; on the other hand, a high σ 0 of a robust network results in enhanced reversibility and linearity in the response of electrical resistance to strain . The robustness of the conductive pathways in the segregated filler structure can fulfill the aforementioned requirements by providing high σ 0 ensuring reliable signal collection and reproducible piezoresistive properties.…”

Section: Resultsmentioning

confidence: 99%

“…This approach allows achieving good electrical conductivity11b and superior mechanical properties in the composites, as well as multifunctionalities, high strain sensitivity, and wide sensing ranges. Currently, elastomers like thermoplastic polyurethane (TPU),10a,12,13 styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene (SEBS), polydimethylsilioxane (PDMS), and natural rubber have been widely used as flexible substrates to host carbon black (CB),6b,16a graphene,15b,17 carbon nanotubes (CNTs),11a,18 and silver nanowires for composite pressure sensor fabrication.…”

Section: Introductionmentioning

confidence: 99%

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Design Strategy for Porous Composites Aimed at Pressure Sensor Application

Sang

2019

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115

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Flexible and highly sensitive pressure sensors have versatile biomedical engineering applications for disease diagnosis and healthcare. The fabrication of such sensors based on porous structure composites usually requires complex, costly, and nonenvironmentally friendly procedures. As such, it is highly desired to develop facile, economical, and environment‐friendly fabrication strategies for highly sensitive lightweight pressure sensors. Herein, a novel design strategy is reported to fabricate porous composite pressure sensors via a simple heat molding of conductive fillers and thermoplastic polyurethane (TPU) powders together with commercially available popcorn salts followed by water‐assisted salt removal. The obtained TPU/carbon nanostructure (CNS) foam sensors have a linear resistance response up to 60% compressive strain with a gauge factor (GF) of 1.5 and show reversible and reproducible piezoresistive properties due to the robust electrically conductive pathways formed on the foam struts. Such foam sensors can be potentially utilized for guiding squatting exercises and respiration rate monitoring in daily physical training.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design Strategy for Porous Composites Aimed at Pressure Sensor Application

Sang

2019

Small

115

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“…The mechanical strain is ε = dl/l 0 and ν is the Poisson coefficient. The horizontal mechanical strain is correlated to the vertical displacement applied to the material by: [14,29] ε = dz a…”

Section: Sample Characterizationmentioning

confidence: 99%

Functional Piezoresistive Polymer‐Composites Based on Polycarbonate and Polylactic Acid for Deformation Sensing Applications

Dios

Gonzalo

Tubío

et al. 2020

Macro Materials & Eng

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Multifunctional composites for deformation sensing applications have been developed by solvent casting based on polycarbonate (PC) and polylactic acid (PLA) reinforced with carbon nanotubes (CNT). Composites shows homogeneous filler dispersion and low percolation threshold at 0.1 and 0.06 wt% CNT content for PLA and PC, respectively. The maximum electrical conductivity obtained for the larger filler contents is two order of magnitude higher for PLA composites than for PC ones, showing that the matrix influences the electrical properties of the composites. With respect to the mechanical characteristics, the samples show a maximum strain near 40% and 2.75% for composites with 0.25 and 1 wt% CNT content for PC and PLA, respectively, decreasing for larger filler contents. Concerning the piezoresistive response, 4‐point‐bending experiments from 0.1 to 5 mm, lead to a Gauge Factor (GF) of ≈1 for PC, showing that the piezoresistive response if determined by the geometrical response. On the other hand, PLA composites show GF of ≈3, revealing also intrinsic contributions, due to the variation of the filler network upon material deformation. The resistance variation upon mechanical bending deformation shows linear response for the composites near the percolation threshold and above, for both composites. A proof‐of‐concept of the functional sensing response for applications is achieved by measuring the bending deformation of an endoscope, showing that the developed sensors can determine the bending orientation and intensity, as predicted by the simulation model applied to the endoscope.

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A Flexible Conformal Piezoresistive Sensor Based on Electrospinning for Deformation Monitoring of Carbon Fiber‐Reinforced Polymer

Cheng

Cao

et al. 2023

Adv Eng Mater

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Carbon fiber‐reinforced polymer (CFRP) materials are widely applied in various areas as key structure components. The structural health monitoring of the CFRP components is crucial to prevent catastrophic failure. However, the nonplane surfaces of CFRP components hinder the attaching of monitoring sensors with hard substrates. Therefore, the substrate conditions for sensor preparation are mainly considered in this study. To adapt the proposed sensors to the curved substrate, including nondevelopable surfaces, electrospinning method is used to prepare conformal piezoresistive fiber films, in which polymethyl methacrylate is served as the matrix and carbon nanotubes are utilized as the conductive filler. The piezoresistive fibers covered on CFRP substrates have a gauge factor up to 207.95 and can response to the strain less than 0.05%. Moreover, the sensor also has high durability and the ability to follow the dynamic excitation signals with as high as 50 Hz.

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Piezoresistive performance of polymer-based materials as a function of the matrix and nanofiller content to walking detection application

Cited by 49 publications

References 54 publications

Design Strategy for Porous Composites Aimed at Pressure Sensor Application

Design Strategy for Porous Composites Aimed at Pressure Sensor Application

Functional Piezoresistive Polymer‐Composites Based on Polycarbonate and Polylactic Acid for Deformation Sensing Applications

A Flexible Conformal Piezoresistive Sensor Based on Electrospinning for Deformation Monitoring of Carbon Fiber‐Reinforced Polymer

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