Wearable temperature sensor based on graphene nanowalls

Yang, Jun; Wei, Dapeng; Tang, Linlong; Song, Xianlin; Luo, Wei; Hu, Jin; Gao, Tianpeng; Shi, Haofei; Du, Chunlei

doi:10.1039/c5ra00871a

Cited by 280 publications

(247 citation statements)

References 35 publications

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“…Graphene nanowalls, made of vertically aligned interlaced graphene nanosheets, were transferred onto a PDMS substrate to fabricate flexible temperature sensors (Figure 2a). [78] With the thermal expansion of the PDMS substrate at elevated temperature, the interlaced graphene nanowall network became more loosely connected, resulting in an increase in resistance. In a NTC type temperature sensor based on graphene sensing elements and AgNW electrodes (Figure 2b,c), the temperature sensitivity can be tuned by strain.…”

Section: Wearable Temperature Sensorsmentioning

confidence: 99%

“…Reproduced with permission. [78] Copyright 2015, Royal Society of Chemistry. b) Schematic diagram of the stretchable graphene thermistor consisting of graphene thermoresistive sensing element and AgNW electrodes.…”

Section: Wearable Temperature Sensorsmentioning

confidence: 99%

“…The temperature sensitivity was ≈0.7 Ω °C −1 over the range of RT to 50 °C. [23] Graphene [47,49,[75][76][77][78] and CNTs [79][80][81] have been widely adopted as the thermoresistive sensing elements for wearable temperature sensors. Graphene nanowalls, made of vertically aligned interlaced graphene nanosheets, were transferred onto a PDMS substrate to fabricate flexible temperature sensors (Figure 2a).…”

Section: Wearable Temperature Sensorsmentioning

confidence: 99%

See 2 more Smart Citations

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Yao

Swetha

Zhu

2017

Adv Healthcare Materials

469

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: Wearable Temperature Sensorsmentioning

confidence: 99%

Section: Wearable Temperature Sensorsmentioning

confidence: 99%

Section: Wearable Temperature Sensorsmentioning

confidence: 99%

See 1 more Smart Citation

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Yao

Swetha

Zhu

2017

Adv Healthcare Materials

469

296

View full text Add to dashboard Cite

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“…These sensors generally have a high resolution of temperature, but the complicated structural design and sophisticated fabrication process may hinder their further applications. Active materials with negative temperature coefficients, such as metal oxides [145,146], CNTs [127,147,148], graphene (including rGO) [81,94,149,150], which show decreased resistance with increased temperature, have also been extensively investigated for the fabrication of flexible temperature sensors. The temperature sensors based on these active materials, especially carbon materials, generally have simple fabrication processes and excellent properties, benefiting their applications as wearable sensors for human health monitoring.…”

Section: Flexible Temperature Sensorsmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

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Flexible and wearable sensors have drawn extensive concern due to their wide potential applications in wearable electronics and intelligent robots. Flexible sensors with high sensitivity, good flexibility, and excellent stability are highly desirable for monitoring human biomedical signals, movements and the environment. The active materials and the device structures are the keys to achieve high performance. Carbon nanomaterials, including carbon nanotubes (CNTs), graphene, carbon black and carbon nanofibers, are one of the most commonly used active materials for the fabrication of high-performance flexible sensors due to their superior properties. Especially, CNTs and graphene can be assembled into various multi-scaled macroscopic structures, including one dimensional fibers, two dimensional films and three dimensional architectures, endowing the facile design of flexible sensors for wide practical applications. In addition, the hybrid structured carbon materials derived from natural bio-materials also showed a bright prospect for applications in flexible sensors. This review provides a comprehensive presentation of flexible and wearable sensors based on the above various carbon materials. Following a brief introduction of flexible sensors and carbon materials, the fundamentals of typical flexible sensors, such as strain sensors, pressure sensors, temperature sensors and humidity sensors, are presented. Then, the latest progress of flexible sensors based on carbon materials, including the fabrication processes, performance and applications, are summarized. Finally, the remaining major challenges of carbon-based flexible electronics are discussed and the future research directions are proposed. [56,57], have been used as the active components for the fabrication of flexible sensors. Among these materials, metal NPs can be used to fabricate flexible sensors with high sensitivity, but the sensing range and stretchability of these sensors are limited [58]. Besides, due to the limited chemical stability and reproducibility of metal nanowires, it is challenging to fabricate stable sensors using metal nanowires [10]. Similarly, conductive polymers with poor stability and conductivity are also difficult to be used for the fabrication of high-performance sensors [59]. In contrast, carbon materials are one of the most commonly investigated materials, especially CNTs and graphene (including graphene oxide (GO) and reduced graphene oxide (rGO)), due to their remarkable mechanical, electrical and thermal properties. To implement macroscopic applications, CNTs and graphene with superior properties in microscopic level should be converted into macroscopic functional assemblies, such as one dimensional (1D) fibers or yarns [60,61], two dimensional (2D) films or sheets [62,63], three dimensional (3D) architectures [64][65][66] (Fig. 1). The multi-scaled macroscopic carbon nanomaterials endow the flexible sensors with high sensitivity, excellent flexibility and good stability as well as desired configurations. Also, lo...

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“…Actually, GNWs have been proven to possess excellent light absorption from NIR to MIR region [23][24][25] due to the abundance of edges and index of refraction close to unity at the interface. Additionally, our previous work [26] reported that GNWs have a considerably high TCR. Furthermore, in terms of IR detectors, GNWs also show a great market potential.…”

Section: Introductionmentioning

confidence: 99%

Anomalous temperature coefficient of resistance in graphene nanowalls/polymer films and applications in infrared photodetectors

et al. 2018

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Graphene nanowalls (GNWs) exhibit outstanding optoelectronic properties due to their peculiar structure, which makes them a great potential in infrared (IR) detection. Herein, a novel IR detector that is composed of polydimethylsiloxane (PDMS) and designed based on GNWs is demonstrated. Such detector possesses an anomalous temperature coefficient of resistance of 180% K −1 and a relatively high change rate of current (up to 16%) under IR radiation from the human body. It primarily attributes to the ultra-high IR absorption of the GNWs and large coefficient of thermal expansion of PDMS. In addition, the GNW/PDMS device possesses excellent detection performance in the IR region with a responsivity of ~1.15 mA W , which is one or two orders of magnitude larger than that of the traditional carbon-based IR detectors. The significant performance indicates that the GNW/PDMS-based devices reveal a novel design concept and promising applications for the future new-generation IR photodetectors.

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Wearable temperature sensor based on graphene nanowalls

Abstract: This work reports an ultrasensitive wearable temperature sensor based on GNWs/PDMS for personalized healthcare and human–machine interface systems.

Cited by 280 publications

References 35 publications

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Advanced carbon materials for flexible and wearable sensors

Anomalous temperature coefficient of resistance in graphene nanowalls/polymer films and applications in infrared photodetectors

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