Recently, flexible energy generators
with good performance have trigged enormous interest because of their
great potential application in developing full flexible self-powered
electronics. Herein, we reported a flexible high-performance piezoelectric
nanogenerator (PNG) based on composition-gradient multilayered poly(vinylidene
fluoride) (PVDF) nanocomposites wherein a novel three-dimensional
(3D) carbon-based nanoparticle was employed as the nanofiller. Making
use of this novel 3D nanofiller and composition-gradient concept,
one can efficiently promote the interfacial coupling effect and induce
internal strain inside the PVDF matrix, contributing to dramatically
improved piezoelectricity and consequently output performance for
PNG. With the excellent output ability, the PNG also demonstrated
to be capable of operating in both d
33 and d
31 modes and possesses high stability
as well as durability, confirming its applicability as green power
source for full flexible electronic systems.
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 d33 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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