Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 8, Pages 5618-5626Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b12588
Keywords
strain sensors; skin-attachable sensors; wearable sensors; parallel microcracks; human motion detection
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There is an increasing demand for flexible, skin attachable, and wearable strain sensors due to their various potential applications. However, achieving strain sensors with both high sensitivity and high stretchability is still a grand challenge. Here, we propose highly sensitive and stretchable strain sensors based on the reversible microcrack formation in composite thin films. Controllable parallel microcracks are generated in graphite thin films coated on elastomer films. Sensors made of graphite thin films with short microcracks possess high gauge factors (maximum value of 522.6) and stretchability (epsilon >= 50%), whereas sensors with long micro cracks show ultrahigh sensitivity (maximum value of 11 344) with limited stretchability (epsilon <= 50%). We demonstrate the high performance strain sensing of our sensors in both small and large strain sensing applications such as human physiological activity recognition, human body large motion capturing, vibration detection, pressure sensing, and soft robotics.
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