Abstract
Wearable sensors for detection of human activities have encouraged the development of highly elastic sensors. In particular, to capture subtle and large-scale body motion, stretchable and wide-range strain sensors are highly desired, but still a challenge. Herein, a highly stretchable and transparent stain sensor based on ionic liquids and elastic polymer has been developed. The as-obtained sensor exhibits impressive stretchability with wide-range strain (from 0.1% to 400%), good bending properties and high sensitivity, whose gauge factor can reach 7.9. Importantly, the sensors show excellent biological compatibility and succeed in monitoring the diverse human activities ranging from the complex large-scale multidimensional motions to subtle signals, including wrist, finger and elbow joint bending, finger touch, breath, speech, swallow behavior and pulse wave.
Highlights
IntroductionWearable sensors have attracted great attention due to their fascinating efficacy, and achieved considerable progress along with the development of flexible and stretchable electronics [1,2]
Wearable sensors have attracted great attention due to their fascinating efficacy, and achieved considerable progress along with the development of flexible and stretchable electronics [1,2].Such sensors require the capability of detecting physiological signals as small as pulses and as large as human motions
Benefiting from high sensitivity at small strain range, the detection limit could be as small as 0.1%, and the output signal was highly reproducible at small strains (Figure 2c), The strain sensor showed fast switching and stable properties to wide-range strain between the stretching and releasing cycles
Summary
Wearable sensors have attracted great attention due to their fascinating efficacy, and achieved considerable progress along with the development of flexible and stretchable electronics [1,2] Such sensors require the capability of detecting physiological signals as small as pulses and as large as human motions. Ionic conductor and liquid metal with lower Young’s modulus than elastomeric supports, which theoretically eliminated the crack or delamination, were used as filler materials to construct wearable sensors [16,17,18,19] These sensors showed high stretchability and good sensitivity. Sensors 2017, 17, 2621 between the high sensitivity and broad sensing range [26,27] still limited the application in detecting physiological signals as small as pulses and as large as human motions. The easy fabrication process and multifunctional characteristics gave the stretchable sensor potential application in wearable electronics
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