Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 38, Pages 43009-43017Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11705
Keywords
strain sensor; wearable electronic; conductive composite; body motion monitoring; wearable internet of things
Funding
- Key Research Project of Hunan Province [2019GK2111, 2018GK2044]
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/P018998/1]
- Royal Society [IE161019]
- National Natural Science Foundation of China
- EPSRC [EP/P018998/1] Funding Source: UKRI
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Flexible and stretchable strain sensors are vital for emerging fields of wearable and personal electronics, but it is a huge challenge for them to possess both wide-range measurement capability and good sensitivity. In this study, a highly stretchable strain sensor with a wide strain range and a good sensitivity is fabricated based on smart composites of carbon black (CB)/wrinkled Ecoflex. The sensor exhibits a maximum recoverable strain of up to 500% and a high gauge factor of 67.7. It has a low hysteresis, a fast signal response (as short as 120 ms), and a high reproducibility (up to 5000 cycles with a strain of 150%). The sensor is capable of detecting and capturing wide-range human activities, from speech recognition and pulse monitoring to vigorous motions. It is also applicable for real-time monitoring of robot movements and vehicle security crash in an anthropomorphic field. More importantly, the sensor is successfully used to send signals of a volunteer's breathing data to a local hospital in real time through a big data cloud platform. This research provides the feasibility of using a strain sensor for wearable Internet of things and demonstrates its exciting prospect for healthcare applications.
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