Journal
ADVANCED ELECTRONIC MATERIALS
Volume 9, Issue 2, Pages -Publisher
WILEY
DOI: 10.1002/aelm.202201013
Keywords
composition gradient; ionic liquids; piezoelectric; poly(vinylidene fluoride) (PVDF); sensors
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The advent of pressure sensors for intelligence terminal devices and skin-inspired electronics has triggered rapid development of flexible, sensitive, and transparent sensing materials. By employing ionic liquids ([EMIM]Cl) additive and a composition-gradient multilayered architecture design, the piezo-response of piezo-active poly(vinylidene fluoride) (PVDF) can be enhanced, resulting in high transparency and sensitivity ILs/PVDF composites that are suitable for reliable pressure sensors.
Nowadays, the advent of pressure sensors for intelligence terminal devices and skin-inspired electronics has trigged rapid development of flexible, sensitive, and transparent sensing materials. Piezo-active poly(vinylidene fluoride) (PVDF) is emerging as a promising candidate for sensing components due to the flexible and transparent features. However, the inherent weak piezo-activity and consequently low sensitivity of PVDF remains a challenge for its sensing applications. Herein, ionic liquids ([EMIM]Cl) additive combined with a composition-gradient multilayered architecture design are employed to hardness the piezo-response of PVDF. The resultant composites present ultra-high piezoelectric coefficient d(33) of 39 pC N-1, which is 2.78 times that of PVDF. Meanwhile, the transparent ILs dopant enables the composites with superior transparency (87%). With notable advantages of high transparency and piezoelectricity, the ILs/PVDF composites exhibit high sensitivity of 0.0423 V N-1, ultra-fast recovery time of 0.2 ms and stable operation capability when coupled with metal electrodes, confirming their applicability for reliable pressure sensor.
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