Fingertip skin–inspired microstructured ferroelectric skins discriminate static/dynamic pressure and temperature stimuli

Park, Jonghwa; Kim, Marie; Lee, Youngoh; Lee, Heon Sang

doi:10.1126/sciadv.1500661

Cited by 774 publications

(505 citation statements)

References 69 publications

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“…The high stability of the bump core/ shell NF mats could be attributed to the spherical PEDOT nanostructures present on the PVDF-HFP fibers. The unique structures of the core/shell fibers with PEDOT bumps provide the conductive sponge mat with sufficient contact sites when it is compressed and also play a role in stress dissipation when the force is released 40,41 . In the pristine PVDF-HFP/PEDOT mat, several layers of fibers were randomly entangled and stacked to form a porous structure.…”

Section: Mechanoelectrical and Morphological Properties Of Pvdf-hfp/pmentioning

confidence: 99%

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

2018

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Polymer-based pressure sensors play a key role in realizing lightweight and inexpensive wearable devices for healthcare and environmental monitoring systems. Here, conductive core/shell polymer nanofibers composed of poly (vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP)/poly(3,4-ethylenedioxythiophene) (PEDOT) are fabricated using three-dimensional (3D) electrospinning and vapor deposition polymerization methods, and the resulting sponge-like 3D membranes are used to create piezoresistive-type pressure sensors. Interestingly, the PEDOT shell consists of well-dispersed spherical bumps, leading to the formation of a hierarchical conductive surface that enhances the sensitivity to external pressure. The sponge-like 3D mats exhibit a much higher pressure sensitivity than the conventional electrospun 2D mats due to their enhanced porosity and pressure-tunable contact area. Furthermore, large-area, wireless, 16 × 10 multiarray pressure sensors for the spatiotemporal mapping of multiple pressure points and wearable bands for monitoring blood pressure have been fabricated from these 3D mats. To the best of our knowledge, this is the first report of the fabrication of electrospun 3D membranes with nanoscopically engineered fibers that can detect changes in external pressure with high sensitivity. The developed method opens a new route to the mass production of polymer-based pressure sensors with high mechanical durability, which creates additional possibilities for the development of human-machine interfaces.

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Section: Mechanoelectrical and Morphological Properties Of Pvdf-hfp/pmentioning

confidence: 99%

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

2018

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“…To facilitate comparison of the geometrical shape effect on the stress sensing properties, an interlocked geometry of the different microstructure arrays was employed. This has been reported to enhance the variation in contact area and localized stress in the microstructures, thereby improving the stress sensitivity and multidirectional force sensing capabilities of eskins [25][26][27][28] . For the fundamental understanding of the sensing mechanisms, experimental piezoresistive properties were compared to the finite-element simulation of contact-area change and the localized stress distribution of microstructured e-skins.…”

Section: Introductionmentioning

confidence: 99%

Tailoring force sensitivity and selectivity by microstructure engineering of multidirectional electronic skins

et al. 2018

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Electronic skins (e-skins) with high sensitivity to multidirectional mechanical stimuli are crucial for healthcare monitoring devices, robotics, and wearable sensors. In this study, we present piezoresistive e-skins with tunable force sensitivity and selectivity to multidirectional forces through the engineered microstructure geometries (i.e., dome, pyramid, and pillar). Depending on the microstructure geometry, distinct variations in contact area and localized stress distribution are observed under different mechanical forces (i.e., normal, shear, stretching, and bending), which critically affect the force sensitivity, selectivity, response/relaxation time, and mechanical stability of e-skins. Microdome structures present the best force sensitivities for normal, tensile, and bending stresses. In particular, microdome structures exhibit extremely high pressure sensitivities over broad pressure ranges (47,062 kPa −1 in the range of <1 kPa, 90,657 kPa −1 in the range of 1-10 kPa, and 30,214 kPa −1 in the range of 10-26 kPa). On the other hand, for shear stress, micropillar structures exhibit the highest sensitivity. As proof-of-concept applications in healthcare monitoring devices, we show that our e-skins can precisely monitor acoustic waves, breathing, and human artery/carotid pulse pressures. Unveiling the relationship between the microstructure geometry of e-skins and their sensing capability would provide a platform for future development of high-performance microstructured e-skins.

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“…Complicated tactile sensing system under bland skin is illustrated in Figure 15 . At present, pressure sensors are primarily based on the strength induced variation in capacitance,149, 150 piezoelectricity,151, 152 resistivity,17 triboelectricity 153. And graphene has been applied in the design of light and wearable pressure sensors.…”

Section: The Human‐like Senses and Feedbacksmentioning

confidence: 99%

Human‐Like Sensing and Reflexes of Graphene‐Based Films

et al. 2016

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Humans have numerous senses, wherein vision, hearing, smell, taste, and touch are considered as the five conventionally acknowledged senses. Triggered by light, sound, or other physical stimulations, the sensory organs of human body are excited, leading to the transformation of the afferent energy into neural activity. Also converting other signals into electronical signals, graphene‐based film shows its inherent advantages in responding to the tiny stimulations. In this review, the human‐like senses and reflexes of graphene‐based films are presented. The review starts with the brief discussions about the preparation and optimization of graphene‐based film, as where as its new progress in synthesis method, transfer operation, film‐formation technologies and optimization techniques. Various human‐like senses of graphene‐based film and their recent advancements are then summarized, including light‐sensitive devices, acoustic devices, gas sensors, biomolecules and wearable devices. Similar to the reflex action of humans, graphene‐based film also exhibits reflex when under thermal radiation and light actuation. Finally, the current challenges associated with human‐like applications are discussed to help guide the future research on graphene films. At last, the future opportunities lie in the new applicable human‐like senses and the integration of multiple senses that can raise a revolution in bionic devices.

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Fingertip skin–inspired microstructured ferroelectric skins discriminate static/dynamic pressure and temperature stimuli

Abstract: Fingertip skin-mimicking ferroelectric skins sensitively detect and discriminate static/dynamic pressure and temperature.

Cited by 774 publications

References 69 publications

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

Tailoring force sensitivity and selectivity by microstructure engineering of multidirectional electronic skins

Human‐Like Sensing and Reflexes of Graphene‐Based Films

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