Stretchable E‐Skin Apexcardiogram Sensor

You, Insang; Kim, Bongsoo; Park, Jaeyoon; Koh, Kunsuk; Shin, Sangbaie; Jung, Sungjune; Jeong, Unyong

doi:10.1002/adma.201600720

Cited by 191 publications

(155 citation statements)

References 25 publications

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“…Numerous sensors have been demonstrated. The three major mechanical-to-electrical conversion principles are the capacitance [3][4][5][6][7][8] , piezo-electricity 9,10 , and piezoresistivity [11][12][13][14][15][16][17] . Piezo-based sensors rely upon either electrical voltage or resistance changes under mechanical deformation.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, high-performance piezoresistivity in 1D or 2D nanomaterials with efficient pressure-sensitive percolation of their networked structures upon pressure application has been employed. This property gave rise to a high pressure sensitivity [12][13][14] . On the other hand, capacitive sensors utilize capacitance changes in pressure-sensitive dielectric films under mechanical stimuli.…”

Section: Introductionmentioning

confidence: 99%

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Block copolymer structural color strain sensor

et al. 2018

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The development of electrically responsive sensors based on the capacitance, voltage, and resistance that can detect and simultaneou sly visualize the large strain involved with human motion is in great demand. Here, we demonstrate a highly stretchable, large strain capacitive sensor that can visualize strain based on the strain-responsive structural color (SC). Our device contains an elastomeric sensing film that produces a capacitance change under strain, in which a selfassembled block copolymer (BCP) photonic crystal (PC) film with 1D periodic in-plane lamellae aligned parallel to the film surface is embedded for the efficient visualization of strain. The capacitance change arises from changes in the dimensions of the elastomer film under strain. The mechanochromic BCP PC film responds to strain, giving rise to an SC change with strain. The initial red SC of the sensor blueshifts and turns blue when the sensor is stretched to 100%, resulting in a full-color SC alteration as a function of the strain. Our BCP SC strain sensor exhibits a fast strain response with multi-cycle reliability of both the capacitance and SC changes over 1000 cycles. This property allows for efficient visible recognition not only of the strained positions during finger bending and poking with a sharp object but also of the shapes of the strained objects.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Block copolymer structural color strain sensor

et al. 2018

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“…Figure 9a depicts the application of an AuNP-based resistive strain sensor in detecting the temporal changes of volume and pressure in the heart under normal state and after exercise. [115] The ACG waveform clearly indicated all the characteristic peaks, providing valuable information for cardiac diagnosis. Heart rate is closely related to the physical and mental state of a person.…”

Section: Health Monitoringmentioning

confidence: 99%

“…Reproduced with permission. [115] b) Relative resistance change of a graphene based strain sensor corresponding to the respiration under normal and exercise state. The inset shows the sensor attached on the chest.…”

Section: Health Monitoringmentioning

confidence: 99%

“…Wearable strain sensors based on the disconnection (sliding) have been fabricated in a number of ways such as depositing AuNPs onto PDMS, [115] embedding AgNWs into PDMS, [111] electrospinning Au nanotroughs onto PDMS, [116] mixing SWCNTs with self-healing hydrogel, [117] sandwiching SWCNTs between two PU-PEDOT:PSS electrodes, [46] aligning CNTs onto a substrate, [53,118] growing well-aligned ZnO NWs on the textile substrate, [119] laser-scribing graphene coated on PET substrate, [113] encapsulating graphene-nanocellulose nanopaper in PDMS, [51] and infusing graphene into rubber. [120] Tensile strain can decrease the overlapped area between nanomaterials and decrease the number of conductive pathways, leading to an increase in resistance.…”

Section: Resistive Strain Sensorsmentioning

confidence: 99%

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Nanomaterial‐Enabled Wearable Sensors for Healthcare

Yao

Swetha

Zhu

2017

Adv Healthcare Materials

453

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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Smart Nanotextiles Applications: A General Overview

Yılmaz

2022

Smart Nanotextiles

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Stretchable E‐Skin Apexcardiogram Sensor

Cited by 191 publications

References 25 publications

Block copolymer structural color strain sensor

Block copolymer structural color strain sensor

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Smart Nanotextiles Applications: A General Overview

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