Highly Flexible Wrinkled Carbon Nanotube Thin Film Strain Sensor to Monitor Human Movement

Park, Sun‐Jun; Kim, Joshua; Chu, Michael; Khine, Michelle

doi:10.1002/admt.201600053

Cited by 164 publications

(146 citation statements)

References 64 publications

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“…[95][96][97] Currently, nanomaterial-based sensors are mainly prepared by incorporating nanomaterials into flexible or elastic substrate, such as a fiber, fabric, or polymer matrix. [100][101][102][103][104] Lou et al [100] have electrospun poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) nanofibers and encapsulated them with reduced graphene oxide (rGO) to form a rapid responsive pressure sensor. To fabricate the wearable nanomaterial-based sensors, spin coating, spray coating, drop casting, dip coating, layer-by-layer assembly, vacuum filtration, and direct printing or writing techniques are among key interests of researchers currently.…”

Section: Materials Structures and Methods In Wearable Sensorsmentioning

confidence: 99%

“…To fabricate the wearable nanomaterial-based sensors, spin coating, spray coating, drop casting, dip coating, layer-by-layer assembly, vacuum filtration, and direct printing or writing techniques are among key interests of researchers currently. Strain sensor based on CNT and shape memory polymers has reported an impressive strain rate over 700% [103] strain and vacuum filtration based graphene nanopaper prepared by Yan and team [104] has shown strain rate over 100%. Park et al [101] have dip coated a fabric yarn to CuZr alloy (metallic glass)/PDMS Co-sputtering [12] Silver nanowire (Ag NW)/PDMS Vacuum filtration transfer [18] Silicone prepolymer/Al Spin coating [19] Ag-NW/styrene-butadiene-styrene (SBS) Solution casting [44] Ag-NW/cotton Dip coating [49] Silica NP/PDMS/cellulose acetate/IL/silver/cotton Coating/thermal evaporation [50] Aligned boron nitride (BN)/polyvinyl alcohol (PVA) 3D printing [51] PEDOT/cloth Coating/vapor phase polymerization [52] Nylon-6 nanofiber/Ag/nanoporous polyethylene (nano-PE) Electrospinning/electroless plating [53] Graphene/polyisobutylene (PIB)/PDMS Chemical vapor deposition/spin coating [54] Copper nanowire (Cu-NW)/poly (methyl methacrylate) (PMMA) Spray coating/spin coating [55] Cu wire/alumina/polyimide/PDMS Atomic layer deposition (ALD)/spin coating [178] Actuator/muscle MWCNT/carbon nanofiber/PEDOT:PSS Electrospinning/drop casting [6] Graphene oxide/vapor grown carbon fiber (VGCF)/IL Solution casting [8] PEDOT:PSS Wet spinning/ chemical treatment [17] Bacterial cellulose (BC)/IL/graphene Solution casting [23] PEDOT:PSS/VGCF/IL Solution casting [33] IL/polyurethane/PEDOT:PSS Solution casting [34] BC/IL/ionic polymer Dip coating [59] PEDOT-polystyrene sulfonic acid (PEDOT:PSS)/IL/BC Solution casting [179] Poly(ionic liquid)(PIL)/polyacrylic acid/paper Dip coating [65] Drug delivery Mesoporous silica nanoparticle Transfer printing [21] PDMS Soft lithography [61] www.advmat.de www.advancedsciencenews.com form a highly stretchable strain sensor that can stretch up to 150% along its axis while Lipomi et al [102] spray coated CNT to form a stretchabl...…”

Section: Materials Structures and Methods In Wearable Sensorsmentioning

confidence: 99%

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Significance of Nanomaterials in Wearables: A Review on Wearable Actuators and Sensors

et al. 2018

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Powered by market hype, trends among youth, and enormous funds, wearable technology has propelled itself as one of the most discussed topics in the field during past few years. A number of different companies representing all throughout the world have already entered into the market with hundreds of different products like smart watches, fitness trackers, smart garments, and even different smart medical attachments.Together with the evolution of digital health care, the wearable electronics field has evolved rapidly during the past few years and is expected to be expanded even further within the first few years of the next decade. As the next stage of wearables is predicted to move toward integrated wearables, nanomaterials and nanocomposites are in the spotlight of the search for novel concepts for integration. In addition, the conversion of current devices and attachment-based wearables into integrated technology may involve a significant size reduction while retaining their functional capabilities. Nanomaterialbased wearable sensors have already marked their presence with a significant distinction while nanomaterial-based wearable actuators are still at their embryonic stage. This review looks into the contribution of nanomaterials and nanocomposites to wearable technology with a focus on wearable sensors and actuators.

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Section: Materials Structures and Methods In Wearable Sensorsmentioning

confidence: 99%

Section: Materials Structures and Methods In Wearable Sensorsmentioning

confidence: 99%

Significance of Nanomaterials in Wearables: A Review on Wearable Actuators and Sensors

et al. 2018

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“…[44] By using wrinkled CNTs enabled by heating the prestrained shape memory polymer above its glass transition temperature, the fabricated CNT-Ecoflex strain sensor could sense the strain up to 700%. [39] In the low-strain range (0-400%), low GF of 0.65 was obtained. The CNT film started to facture under a strain beyond 400%, leading to a higher GF of 48.…”

Section: Resistive Strain Sensorsmentioning

confidence: 94%

“…The opening and propagation of cracks www.advancedsciencenews.com www.advhealthmat.de leads to increase in the resistance and on the contrary, the closing of the cracks leads to recovery of the resistance. Examples include strain sensors based on AgNPs coated fiber mat, [56] AuNW/latex, [44,68] CNT/PDMS, [121] CNT-Ecoflex, [39] SWCNT paper-PDMS, [122] graphene/PDMS, [123] graphene woven fabric/ PDMS, [103,124] graphene coated yarns, [52] fragmentized graphene foam/PDMS, [125] and fish-scale-like rGO. [126] Figure 4b shows the fractured SWCNT film attached onto PDMS.…”

Section: Resistive Strain Sensorsmentioning

confidence: 99%

“…[18,[33][34][35] To fabricate the wearable sensors, conventional lithographic processes can be extended to pattern nanomaterials. [23,[36][37][38] Solution based processing methods such as spray coating, [25,39,40] drop casting, [41][42][43][44][45] spin coating, [46,47] dip coating, [48] vacuum filtration, [49][50][51] and layer-by-layer assembly [52] were commonly used for fabrication of nanomaterial-based sensors. Direct spinning of CNTs onto a substrate or into yarns [53][54][55] and electrospinning of nanofibers or NWs were reported to produce fiber-like nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

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Nanomaterial‐Enabled Wearable Sensors for Healthcare

Yao

Swetha

Zhu

2017

Adv Healthcare Materials

454

296

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humidity level, and concentration of harmful gases, and airborne particulates can provide valuable information for the prediction, management, and treatment of chronic diseases. [4,5] In addition to the applications in wearable health monitoring, continuous tracking of daily and sports activities can offer an efficient way to assess the well-being and athletic performances. [6] In order to ensure a robust and conformal contact with the curvilinear, coarse, and dynamic surface of skin without impeding daily activities, the wearable sensor should have low modulus and high stretchability. The epidermis has a modulus of 140-600 kPa while the dermis has an even lower modulus of 2-80 kPa. [7] Skin itself can be stretched elastically up to 15% and with the help of wrinkles and creases, the overall stretchability can reach as high as 100% during daily motions. [8] In addition to good wearability, wearable sensors should be highly sensitive, lightweight, low-cost, and with low power consumption. To achieve these features, nanomaterials that are compliant, possessing larger surface area and exceptional material properties, and compatible with low-cost fabrication processes are widely employed as building blocks for developing wearable sensors.In this review, we start from a brief overview of nanomaterials, their related structural designs and fabrication processes (Section 2). Following that, recent advances of nanomaterialenabled wearable sensors including temperature, electrophysiological, strain, tactile, electrochemical, and other sensors will be summarized (Section 3). A survey on the integration of multiple sensors and other components into wearable systems will be given in Section 4. The application of nanomaterialenabled wearable sensors for healthcare including health monitoring, activity tracking, and electronic skin will be presented in Section 5. The challenges and opportunities will be discussed at the end. Nanomaterials, Structural Designs, and Fabrication ProcessesNanomaterials can be classified into two categories-top-down fabricated ones and bottom-up synthesized ones. [9] The focus of this review is on the wearable sensors based on bottom-up synthesized nanomaterials. Nanomaterials can be synthesized into various dimensions, from 0D such as metallic nanoparticles (NPs), to 1D such as carbon nanotubes (CNTs), and metallic nanowires (NWs), to 2D such as graphene and transition metal Highly sensitive wearable sensors that can be conformably attached to human skin or integrated with textiles to monitor the physiological parameters of human body or the surrounding environment have garnered tremendous interest. Owing to the large surface area and outstanding material properties, nanomaterials are promising building blocks for wearable sensors. Recent advances in the nanomaterial-enabled wearable sensors including temperature, electrophysiological, strain, tactile, electrochemical, and environmental sensors are presented in this review. Integration of multiple sensors for multimodal sensing and integration with...

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Nanomaterials for Wearable, Flexible, and Stretchable Strain/Pressure Sensors

Sedighi¹,

Montazer²

2022

Nanotechnology in Electronics

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Highly Flexible Wrinkled Carbon Nanotube Thin Film Strain Sensor to Monitor Human Movement

Cited by 164 publications

References 64 publications

Significance of Nanomaterials in Wearables: A Review on Wearable Actuators and Sensors

Significance of Nanomaterials in Wearables: A Review on Wearable Actuators and Sensors

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Nanomaterials for Wearable, Flexible, and Stretchable Strain/Pressure Sensors

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