期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 25, 页码 29441-29450出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c06703
关键词
strain sensors; scorpion; high sensitivity; curved crack; noncontact vibration
资金
- National Natural Science Foundation of China [51835006, 51875244]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [52021003]
- Jilin University Science and Technology Innovative Research Team [2020TD-03]
- Natural Science Foundation of Jilin Province [20200201232JC]
- Education Department of Jilin Province [JJKH20220979KJ]
- Interdisciplinary Integration and Innovation Project of JLU [JLUXKJC2021ZZ03]
- China Postdoctoral Science Foundation [2021M703632]
- Fundamental Research Funds for the Central Universities
This study designed and fabricated a scorpion-inspired flexible strain sensor that improves sensor performance through ordered crack structures. The sensor exhibits ultrahigh sensitivity, excellent stability, and fast response time, and demonstrates great potential in human-health monitoring and vibration signal detection applications.
Slit sensillum, a unique sensing organ on the scorpion's legs, is composed of several cracks with curved shapes. In fact, it is just its particular morphological distribution and structure that endows the scorpions with ultrasensitive sensing capacity. Here, a scorpion-inspired flexible strain sensor with an ordered concentric circular curved crack array (CCA) was designed and fabricated by using an optimized solvent-induced and template transfer combined method. The morphology of the cracks can be effectively controlled by the heating temperature and the lasting time. Instead of the nonuniform stress distribution induced by disordered cracks, ordered concentric circle curved structures are introduced to generate a uniform stress distribution and larger deformation, which can significantly improve the performance of the strain sensor. Thus, the CCA sensor exhibits ultrahigh sensitivity (GF similar to 7878.6), excellent stability (over 16 000 cycles), and fast response time (110 ms). Furthermore, the CCA sensor was demonstrated to be feasible for monitoring human motions and detecting noncontact vibration signals, indicating its great potential in human-health monitoring and vibration signal detection applications.
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