期刊
SMALL
卷 18, 期 33, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202202639
关键词
bending-insensitive UV detectors; liquid crystalline polymers; nanogenerators; self-powered wearable UV detectors; UV detectors
类别
资金
- National Natural Science Foundation of China [52173193]
- Natural Science Foundation of Beijing Municipality [2202024]
- Equipment Pre-research Foundation of China's Central Military Commission [80922010501]
A bending-insensitive, self-powered, and intrinsically flexible UV detector has been developed using well-designed oriented composite fabrics comprising ionic liquid (IL)-containing liquid crystalline polymers (ILCPs) and piezoelectric poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] nanogenerators. The composite fabrics establish effective UV illuminance-internal stress-electric signal conversion through resistive and piezoelectric effects, with a fast response time of 190 ms.
It is significantly challenging for state-of-the-art wearable electronics to stably monitor physicochemical signals under dynamic motions. Herein, a bending-insensitive, self-powered, and intrinsically flexible UV detector has been realized based on well-designed oriented composite fabrics, consisting of ionic liquid (IL)-containing liquid crystalline polymers (ILCPs) and piezoelectric poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] nanogenerators. The novel composite fabrics establish effective UV illuminance-internal stress-electric signal conversion by coupling resistive and piezoelectric effects, with a fast response time of 190 ms. Particularly, benefiting from the intrinsic flexibility of composite fabrics, the ILCP/P(VDF-TrFE) device can maintain stable performance under dynamic bending even if the frequency is up to 2.5 Hz, with a bending insensitivity of less than 1% performance variation under 1.0 mW cm(-2) UV light. Combined with the Internet of Things and the American Standard Code for Information Interchange (ASCII), wearable encoding electronics have been successfully implemented with a printing speed of 3.2 s per character under dynamic bending.
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