Micro-patterned graphene-based sensing skins for human physiological monitoring

Wang, Long; Loh, Kenneth J.; Chiang, Wei‐Hung; Manna, Kausik

doi:10.1088/1361-6528/aaa709

Cited by 28 publications

(25 citation statements)

References 47 publications

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“…nanocomposite whose electrical conductivity is sensitive to applied strains was also designed, fabricated, and characterized. Its strain sensitivity was found to be ~ 10 times higher than films used in other studies 10,29,34 . Second, in order to overcome this limitation, a patterned nanocomposite was proposed to replace conventional continuous thin films.…”

Section: Significance Of the Resultsmentioning

confidence: 61%

“…Several studies already showed that GNS could be integrated into polymer matrices to form high-performance strain sensors. [26][27][28][29] The GNS that was used in this work was synthesized using water-assisted liquid-phase exfoliation. The synthesis procedure was explained in detail in Manna et al 30,31 but is also summarized here for completeness.…”

Section: Nanocomposite Thin Film Preparationmentioning

confidence: 99%

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Graphene sensing meshes for densely distributed strain field monitoring

Gupta

Vella

et al. 2019

Structural Health Monitoring

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The objective of this study is to design and validate distributed strain field monitoring using a patterned nanocomposite “sensing mesh” that is coupled with an electrical impedance tomography (EIT) measurement strategy and algorithm. Although EIT has been used in other studies and in conjunction with a piezoresistive thin film for spatial damage detection, different strain components cannot be directly extracted from reconstructed EIT conductivity maps. Therefore, this study seeks to address this issue by patterning piezoresistive graphene-based thin films to form a mesh-like pattern. The high aspect ratio of each nanocomposite grid interconnect acts as a linear distributed strain sensor, capable of resolving strains along the entire length and direction of the element. This study first began with the design, fabrication, and characterization of the strain sensing response of a graphene-based thin film of high strain sensitivity. Second, the strain-sensitive film was spray-coated onto patterned polymer substrates to form the sensing meshes, which were then subjected to load tests. Upon validating distributed strain field monitoring through EIT, its applicability for field implementation and damage characterization was also demonstrated by instrumenting sensing meshes in the column of a seven-story reinforced-concrete building subjected to shaking table earthquake excitations. The large-scale shaking table test results successfully validated distributed damage detection.

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Section: Significance Of the Resultsmentioning

confidence: 61%

Section: Nanocomposite Thin Film Preparationmentioning

confidence: 99%

Graphene sensing meshes for densely distributed strain field monitoring

Gupta

Vella

et al. 2019

Structural Health Monitoring

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“…Wearability could significantly increase the usage of haptics in our everyday life [44,45] . In the following paragraphs, we In previous studies, the haptic stimulation and physiological feedback system (HSPFS) has been prototyped to deliver the appropriate haptic cueing information, as well as to monitor the physiological signals [46,47] , and hence to improve the human performance in various applications such as (tele) rehabilitation [48,49] , industrial haptic design [50,51] and wearable sensing on psychophysiological states [52][53][54] . In one of the present studies, we built a haptic stimulation and digital signal to the microcontroller through SPI (i. e., Serial Peripheral Interface).…”

Section: Wearable Hapticsmentioning

confidence: 99%

Psychophysics of wearable haptic/tactile perception in a multisensory context

Lei

Zhang

Chen

et al. 2019

Virtual Reality & Intelligent Hardware

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Multisensory lab based in Peking University, has carried out basic studies in multisensory space and time processing, intersensory binding and haptic / tactile perception. We exploited a typical paradigm of multisensory illusion-temporal ventriloquist effect and applied it in a wide range of multisensory interactions (mainly focused on temporal processing). In this work, we summarized how the tactile stimuli were exploited to compose tactile cues and as tactile apparent motion to interface with other sensory stimuli (visual and auditory stimuli) to examine the underlying perceptual organization in a multisensory context. Moreover, we introduced two examples of wearable haptic/tactile perception in our lab, by using two customized tactile devices and discussed the potential applications in this field.

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“…[29] Such skin-mounted ultrathin nanocomposites can reliably capture finger-bending movements, [30] heartbeat and respiration, [31] and eye blinks and radial pulse. [32] Similarly, flexible tattoo-like sensors that integrated smart materials (e.g., polyvinylidene fluoride piezo-polymers or gold-silver nanocomposites) with serpentine-structured interconnects and skin-like medical tape have also been developed. [33][34][35] Another study has utilized a fish scale-like graphene-based sensing layer and demonstrated high sensitivity, stability, and broad sensing range for applications ranging from detecting vitals to monitoring joint-bending motions.…”

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confidence: 99%

Graphene K‐Tape Meshes for Densely Distributed Human Motion Monitoring

Lin

Zhao

Wang

et al. 2020

Adv Materials Technologies

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risks increase with aging and are worsened by the global obesity epidemic. [3] At the other end of the spectrum, athletes, and military service members that undergo intense physical training and recreational activities can suffer severe overuse injuries. [4] Therefore, the ability to accurately monitor the range, amplitude, and quality of bodily movements is critical for promoting behavioral changes that yield higher levels of activity, maintaining and enhancing personal wellness, improving functional performance, preventing debilitating musculoskeletal injuries, and facilitating active rehabilitation. Wearable sensors that measure parameters associated with physical activity and bodily motions have been regarded as an indispensable tool for assessing personal wellness. Among its ≈350 million users worldwide (in 2019), [5,6] mainstream commercialized wearables pack force transducers, gyroscopes, [7] accelerometers, [8] and magnetometers in a hardcase accessory, [9] such as watches or bracelets, [10-12] to record vital signs (e.g., heart rate, respiration rate, peripheral oxygen saturation, and body temperature) and physical activity (e.g., steps). Despite their prevalence, they offer limited accuracy [13-15] , and their large, rigid, and bulky form factors can cause user discomfort or inconvenience, especially for the elderly. Recent advances in flexible sensors allow them to be worn at locations where traditional devices would otherwise be unsuitable or challenging because of their limited stretch-ability. [16] One approach is to integrate soft and flexible elastomeric sensors with fabric to monitor vitals and physiological parameters, [17] garments to measure hip, knee, and ankle kinematics, [18] and gloves to monitor finger motion, pressure, and tensile forces. [19] However, movement-and motion-induced strains in skin may not be effectively nor accurately measured by garment-based sensors due to poor strain transfer. An alternative is to use high-performance, stretchable, elastomeric strain sensors [20] (e.g., using nanomaterials including silver nanoparticles [21] or aligned single-walled carbon nanotubes [22]) mounted directly onto skin. In particular, graphene possesses extraordinary mechanical, thermal, and electrical properties, [23] and many sensors based on graphene exhibit superior sensing performance thanks to their topology-dependent, strain-sensitive, electromechanical properties. [24-26] For instance, a pulse monitor formed by integrating a crisscross graphene Wearable sensors that measure parameters associated with physical activity and bodily motions have been regarded as an indispensable tool for assessing personal wellness. Recent advances in nanocomposite strain sensors have been successfully used for monitoring skin strains and other strain-derived physiological parameters. This study complements the existing body of work and presents a flexible, self-adhering, fabric-based wearable sensor for measuring skin strains and human motions. Graphene nanosheet thin films are directly spray-coated on...

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Micro-patterned graphene-based sensing skins for human physiological monitoring

Cited by 28 publications

References 47 publications

Graphene sensing meshes for densely distributed strain field monitoring

Graphene sensing meshes for densely distributed strain field monitoring

Psychophysics of wearable haptic/tactile perception in a multisensory context

Graphene K‐Tape Meshes for Densely Distributed Human Motion Monitoring

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