Carbon nanotube polymer coatings for textile yarns with good strain sensing capability

Zhang, Rui; Deng, Hua; Valenca, Renata; Li, Guang; Fu, Qiang; Bilotti, Emiliano; Peijs, Ton

doi:10.1016/j.sna.2012.03.029

Cited by 132 publications

(86 citation statements)

References 43 publications

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“…The largest strain measurement capability found herein ($400%, dictated by e DP ) is larger than that reported for the majority of MWCNT/elastomeric composites, 16,17,19 and is similar only to that reported for MWCNT composites with an especially designed (layered) architecture. 15,43 For MWCNT/TF composites, e DP increases when the MWCNT content increases from 3 wt % to 8 wt %, but decreases after 8 wt %.…”

Section: Piezoresistive Propertiessupporting

confidence: 68%

“…MWCNT/polyurethane composites have very promising piezoresistive and large strain sensing capabilities, although irreversible phenomena and hysteresis at large strains is difficult to avoid for cyclic loadings. [15][16][17] Based on the existent literature, it also seems that larger concentrations of MWCNTs are required to obtain reliable piezoresistive properties using elastomers, in comparison to common thermosetting or thermoplastic polymers. However, the concentration needed using other more conventional fillers like carbon black (CB) in an elastomeric matrix is higher than that needed for MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

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Sensing of large strain using multiwall carbon nanotube/segmented polyurethane composites

Bautista-Quijano

Avilés

Cauich-Rodríguez

2013

J of Applied Polymer Sci

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Multiwall carbon nanotube (MWCNT)/elastomeric composite films were fabricated using two segmented polyurethanes: an in-house synthesized one (SPU) and a commercial medical grade one (Tecoflex V R , TF). Electrical, mechanical, and electromechanical (piezoresistive) properties of both composites were evaluated as a function of the MWCNT weight concentration (1-10 wt %). An increase in electrical conductivity for both types of polymers was observed for MWCNT concentrations as low as 1 wt %. The electrical conductivity of MWCNT/TF composites was higher than that achieved for MWCNT/SPU composites. Mechanical properties of 8 wt % MWCNT/SPU composites showed a threefold increase in stiffness compared to neat SPU. The changes in electrical resistance of the composites showed higher sensitivity to strain for lower MWCNT concentrations. The piezoresistive signal of the composites allows to measure strains up to $400% before electrical depercolation occurs. The strain at which electrical depercolation occurs depends on the conductivity of the composite in its unloaded state. This kind of composites may find sensing applications in prosthetics, biomedical devices, and smart textiles.

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Section: Piezoresistive Propertiessupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Sensing of large strain using multiwall carbon nanotube/segmented polyurethane composites

Bautista-Quijano

Avilés

Cauich-Rodríguez

2013

J of Applied Polymer Sci

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“…Similarly, Lipomi et al [16] have demonstrated a spraydeposited film of carbon nanotubes embedded in silicone rubber that could sense strains up to 150%, but experiences significant change in its sensing range and sensitivity when strained. Spandex R yarn coated with carbon nanotubes can detect strains as large as 30% and has been used in preliminary motion sensing studies [17]. Extremely thin films of integrated electronics in soft polymers have been demonstrated as "epidermal electronics" by Kim et al [18] and have been used as electromyographs to measure muscle activation and could withstand strains as high as 40%.…”

Section: Introductionmentioning

confidence: 99%

Soft wearable motion sensing suit for lower limb biomechanics measurements

Mengüç

Park

Martinez-Villalpando

et al. 2013

2013 IEEE International Conference on Robotics and Automation

115

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Abstract-Motion sensing has played an important role in the study of human biomechanics as well as the entertainment industry. Although existing technologies, such as optical or inertial based motion capture systems, have relatively high accuracy in detecting body motions, they still have inherent limitations with regards to mobility and wearability. In this paper, we present a soft motion sensing suit for measuring lower extremity joint motion. The sensing suit prototype includes a pair of elastic tights and three hyperelastic strain sensors. The strain sensors are made of silicone elastomer with embedded microchannels filled with conductive liquid. To form a sensing suit, these sensors are attached at the hip, knee, and ankle areas to measure the joint angles in the sagittal plane. The prototype motion sensing suit has significant potential as an autonomous system that can be worn by individuals during many activities outside the laboratory, from running to rock climbing. In this study we characterize the hyperelastic sensors in isolation to determine their mechanical and electrical responses to strain, and then demonstrate the sensing capability of the integrated suit in comparison with a ground truth optical motion capture system. Using simple calibration techniques, we can accurately track joint angles and gait phase. Our efforts result in a calculated trade off: with a maximum error less than 8%, the sensing suit does not track joints as accurately as optical motion capture, but its wearability means that it is not constrained to use only in a lab.

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“…Common routes to conductive textile surfaces are: metallization by plating (by for example Jiang et al 2006) or sputtering (Depla et al 2011); in situ polymerization of intrinsically conductive polymers (ICP) (Gregory et al 1989;Knittel and Schollmeyer 2009;Oh et al 1999); or CPC coating (Cristian et al 2011;Zhang et al 2012). Metallization offers the advantage of high conductivity, but metallic surfaces are poorly adapted to the demands of a flexible sensor as cracks are easily formed by mechanical forces (Jiang and Guo 2009).…”

Section: Introductionmentioning

confidence: 99%

Textile piezoelectric sensors – melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) coating as the outer electrode

Åkerfeldt

Nilsson

Gillgard³

et al. 2014

Fashion and Textiles

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Textile piezoelectric sensors -melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly (3,4- AbstractThe work presented here addresses the outer electroding of a fully textile piezoelectric strain sensor, consisting of bi-component fibre yarns of β-crystalline poly(vinylidene fluoride) (PVDF) sheath and conductive high density polyethylene (HDPE)/carbon black (CB) core as insertions in a woven textile, with conductive poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) coatings developed for textile applications. Two coatings, one with a polyurethane binder and one without, were compared for the application and evaluated as electrode material in piezoelectric testing, as well as tested for surface resistivity, tear strength, abrasion resistance and shear flexing. Both coatings served their function as the outer electrodes in the system and no difference in this regard was detected between them. Omission of the binder resulted in a surface resistivity one order of magnitude less, of 12.3 Ω/square, but the surface resistivity of these samples increased more upon abrasion than the samples coated with binder. The tear strength of the textile coated with binder decreased with one third compared to the uncoated substrate, whereas the tear strength of the coated textile without binder increased with the same amount. Surface resistivity measurements and scanning electron microscopy (SEM) images of the samples subjected to shear flexing showed that the coatings without the binder did not withstand this treatment, and that the samples with the binder managed this to a greater extent. In summary, both of the PEDOT:PSS coatings could be used as outer electrodes of the piezoelectric fibres, but inclusion of binder was found necessary for the durability of the coating.

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Carbon nanotube polymer coatings for textile yarns with good strain sensing capability

Cited by 132 publications

References 43 publications

Sensing of large strain using multiwall carbon nanotube/segmented polyurethane composites

Sensing of large strain using multiwall carbon nanotube/segmented polyurethane composites

Soft wearable motion sensing suit for lower limb biomechanics measurements

Textile piezoelectric sensors – melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) coating as the outer electrode

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