Wearable, wireless gas sensors using highly stretchable and transparent structures of nanowires and graphene

Park, Jihun; Kim, Joohee; Kim, Kukjoo; Kim, So Yun; Cheong, Woon Hyung; Park, Kyeongmin; Song, Joo Hyeb; Namgoong, Gyeongho; Kim, Jae Joon; Heo, Jaeyeong; Bien, Franklin; Park, Jang Ung

doi:10.1039/c6nr01468b

Cited by 161 publications

(125 citation statements)

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“…3b. These circuits are connected via a magnetic field, which can be characterized by a coupling coefficient4748. Therefore, the wireless sensing antenna analyses how the reflection condition depends on the resistivity change of the sensor.…”

Section: Resultsmentioning

confidence: 99%

Wearable smart sensor systems integrated on soft contact lenses for wireless ocular diagnostics

et al. 2017

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Wearable contact lenses which can monitor physiological parameters have attracted substantial interests due to the capability of direct detection of biomarkers contained in body fluids. However, previously reported contact lens sensors can only monitor a single analyte at a time. Furthermore, such ocular contact lenses generally obstruct the field of vision of the subject. Here, we developed a multifunctional contact lens sensor that alleviates some of these limitations since it was developed on an actual ocular contact lens. It was also designed to monitor glucose within tears, as well as intraocular pressure using the resistance and capacitance of the electronic device. Furthermore, in-vivo and in-vitro tests using a live rabbit and bovine eyeball demonstrated its reliable operation. Our developed contact lens sensor can measure the glucose level in tear fluid and intraocular pressure simultaneously but yet independently based on different electrical responses.

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Section: Resultsmentioning

confidence: 99%

Wearable smart sensor systems integrated on soft contact lenses for wireless ocular diagnostics

et al. 2017

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“…In a CNT/poly(vinyl alcohol) (PVA) fiber based resistive sensors, high humidity level can swell the filament, decrease the intertube distance of CNTs and thus decrease the resistance of the CNT/PVA fibers. [55] To track the gas concentration for personal wellness and security surveillance, wearable gas sensors based on graphene, [32] rGO, [45,173] ZnO NPs, [174] AgNW-graphene, [175] CNT/SnO 2 NW hybrid film, [31] and polypyrrole NPs [176] were developed to detect the concentration of gases such as nitrogen dioxide (NO 2 ), [31,32,173] ammonia (NH 3 ), [176] hydrogen sulfide (H 2 S), [45] hydrogen (H 2 ), [45] ethanol (C 2 H 5 OH), [45,174] acetic acid (CH 3 COOH), [176] dimethyl methylphosphonate (C 3 H 9 O 3 P, DMMP), [175] acetone (CH 3 COCH 3 ), [175] methanol (CH 3 OH), [175] and tetradecane (C 14 H 30 ). [175] Increase or decrease in resistance is typically detected, depending on whether the gaseous stimulus is an electron donator or an electron acceptor.…”

Section: Wearable Environmental Sensorsmentioning

confidence: 99%

“…Wireless transmission capability can be enabled by integrating an antenna [169,175,176] or a Bluetooth module. [42,45,119,175] Flexible gas sensors was connected to a passive RFID to enable wireless detection of NH 3 and acetic acid. [176] The passive feature of the RFID eliminates the need for on-system power supply.…”

Section: Integration Of Wearable Sensors With Other Componentsmentioning

confidence: 99%

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Yao

Swetha

Zhu

2017

Adv Healthcare Materials

432

280

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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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“…The hybridization of AgNWs with other nanomaterials, such as graphene and CNTs, further improves the electrical and mechanical properties of the resulting stretchable and transparent electrodes [3,[28][29][30][31][32][33][34]. For example, the introduction of graphene onto an AgNWbased percolation network (Figure 1(d)) provides additional conducting paths through the two-dimensional structure of graphene beyond the one-dimensional paths of AgNWs, resulting in improved conductivity compared to the AgNW-only electrode.…”

Section: Ag Nanowiresmentioning

confidence: 99%

Nanomaterial-based stretchable and transparent electrodes

Kim

Hyun

Jang

et al. 2016

Journal of Information Display

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The recent advent of unprecedented wearable applications engendered the need for stretchable electronics, which can be realized by making the individual components stretchable. The transparent conducting electrode is one of the most important components of optoelectronic devices. Therefore, developing transparent electrodes in a stretchable form is essential for the implementation of stretchable electronics. In this paper, the recent efforts in the development of stretchable and transparent electrodes, particularly those using nanomaterials such as metal nanowires, metal nanofibers, and carbon nanotubes are introduced. ARTICLE HISTORY

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Wearable, wireless gas sensors using highly stretchable and transparent structures of nanowires and graphene

Cited by 161 publications

References 50 publications

Wearable smart sensor systems integrated on soft contact lenses for wireless ocular diagnostics

Wearable smart sensor systems integrated on soft contact lenses for wireless ocular diagnostics

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Nanomaterial-based stretchable and transparent electrodes

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