Oxide Nanomembrane Hybrids with Enhanced Mechano‐ and Thermo‐Sensitivity for Semitransparent Epidermal Electronics

Park, Minjoon; Do, Kyungsik; Kim, Jaemin; Son, Donghee; Koo, Ja Hoon; Park, Jinkyung; Song, Jae Yoon; Kim, Ji Hoon; Lee, Minbaek; Hyeon, Taeghwan; Kim, Dae‐Hyeong

doi:10.1002/adhm.201500097

Cited by 48 publications

(51 citation statements)

References 29 publications

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“…e) Schematic illustration of the epidermal device containing serpentine-shaped temperature and strain sensors (left) and images of the device attached on human skin (right). [197] f) Schematic diagram showing the integration of multimodal all-graphene sensor array consisting of resistive temperature sensors (rGO), capacitive humidity sensors (GO), and capacitive pressure sensors (two graphene electrodes sandwiched by PDMS). Reproduced with permission.…”

Section: Integrated Wearable Systemsmentioning

confidence: 99%

“…Wearable temperature and mechanical sensors (e.g., strain sensors, pressure sensors, and force sensors) have been integrated to realize wearable health and activity monitoring, human-interactive devices and multifunctional electronic skin. [47,65,80,172,196,197] An array of temperature sensors, threeaxis tactile and slip force sensors were printed onto a flexible substrate (Figure 7d) for electronic skin, where thermoresistive CNT-PEDOT:PSS composites served as flexible temperature sensors and four resistive AgNP-CNT strain sensors were used to detect both normal pressing and slip forces. [196] Ultrathin epidermal sensors patterned in a serpentine configuration were capable of sensing both temperature and strain (Figure 7e).…”

Section: Integration Of Wearable Sensors For Multimodal Sensingmentioning

confidence: 99%

“…[196] Ultrathin epidermal sensors patterned in a serpentine configuration were capable of sensing both temperature and strain (Figure 7e). [197] Thermoresistive Al 2 O 3 -doped ZnO/AgNPs temperature sensors monitored the body temperature and piezoelectric Cr/ZnO/ SWCNT sensors detected the body strain (and movement). Figure 7f presents the integration of all-graphene based sensors for transparent and stretchable electronic skin, [172] in which graphene oxide was used for capacitive humidity sensors and rGO was used for resistive temperature sensors.…”

Section: Integration Of Wearable Sensors For Multimodal Sensingmentioning

confidence: 99%

“…Reproduced with permission. [197] d) The schematic illustration of the setup of the patella reflex experiment (left), and the relative capacitance change associated with lower leg motion during patella reflex experiment as measured by the strain sensor (right). Reproduced with permission.…”

Section: Health Monitoringmentioning

confidence: 99%

“…[82] As another important vital sign, body temperature can be monitored continuously using integrated wearable systems. [79,197] For instance, a temperature sensor based on Al 2 O 3 -doped ZnO/AgNPs (Figure 7e) was attached onto the skin on the radial artery. [197] Temperature variations during various activities including resting, reading a book and occipital cooling were monitored for the detection of hypothermia, as shown in Figure 9c.…”

Section: Health Monitoringmentioning

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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Section: Integrated Wearable Systemsmentioning

confidence: 99%