Journal
ADVANCED ENGINEERING MATERIALS
Volume 22, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.201901239
Keywords
adjustable modulus; capacitive sensing; joint rehabilitation; soft robots; stretchable strain sensor
Categories
Funding
- China International Cooperation Project [2016YFE0126700]
- National Natural Foundation of China [51971233, 51931011, 61774161, 61704177, 51525103]
- CAS President's International Fellowship Initiative (PIFI) [2019PE0019]
- Public Welfare Technical Applied Research Project of Zhejiang Province [2017C31100, LGG19F010006]
- Ningbo Scientific and Technological Innovation 2025 Major Project [2018B10057]
- Ningbo Science and Technology Innovation Team [2015B11001]
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Stretchable strain sensors are important components of soft robotics, rehabilitation assistance, and human health monitoring systems. However, strain sensors capable of wide-range force detection with adjustable modulus facilities are highly desirable to obtain mechanical feedback in various scenarios. Herein, a stretchable capacitive strain sensor capable of adjustable modulus and wide-range force detection is reported. The sensor consists of two liquid metals (LMs) filled thermoplastic elastomer (TPE) tubes encapsulated in flexible silicone. The adjustable modulus capability of the sensor is attained by mounting the sensor with springs of different elastic coefficients. During electromechanical tests, the elastic coefficient-dependent adjustable modulus is obtained in the range of 0.78-10.3 MPa. After optimizing the performance, a sensor capable of wide force-sensing range (0.07-74 N), high cyclic stability (>3500 cycles), with low hysteresis, good linearity, and fast response time (<50 ms) is achieved. Finally, a digital display system is developed to display the amount of detected force during the loading of the sensor, which confirms the great capability of the sensor to be applied in joint rehabilitation and soft robotic fields.
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