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摘要:
For traditional piezoelectric sensors based on poled ceramics, a low curie tem-perature (Tc) is a fatal flaw due to the depolarization phenomenon. However, in this study, we find the low Tc would be a benefit for flex-ible piezoelectric sensors because small alterations of force trig-ger large changes in polarization. BaTi0.88Sn0.12O3 (BTS) with high piezoelectric coefficient and low Tc close to human body temperature is taken as an example for materials of this kind. Continuous piezo-electric BTS films were deposited on the flexible glass fiber fabrics (GFF), self-powered sensors based on the ultra-thin, superflexible, and polarization-free BTS-GFF/PVDF composite piezoelectric films are used for human motion sensing. In the low force region (1-9 N), the sensors have the outstanding performance with voltage sensitivity of 1.23 V N-1 and current sensitivity of 41.0 nA N-1. The BTS-GFF/PVDF sensors can be used to detect the tiny forces of falling water drops, finger joint motion, tiny surface deformation, and fatigue driving with high sensitivity. This work provides a new paradigm for the preparation of superflexible, highly sensitive and wearable self-powered piezoelectric sensors, and this kind of sensors will have a broad application prospect in the fields of medical rehabilitation, human motion monitoring, and intelligent robot.
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篇名 Superflexible and Lead-Free Piezoelectric Nanogenerator as a Highly Sensitive Self-Powered Sensor for Human Motion Monitoring
来源期刊 纳微快报(英文版) 学科
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年,卷(期) 2021,(8) 所属期刊栏目
研究方向 页码范围 28-39
页数 12页 分类号
字数 语种 英文
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纳微快报(英文)
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2311-6706
31-2103/TB
上海市东川路800号
eng
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