Quadrant-electroded nanogenerators for decoupling piezoelectricity and flexoelectricity in the electromechanical outputs in flexible devices

Yan, Yan; Ma, Xiaoting; Nguyen, Thanh Mien; Ha, Sung‐Hun; Ahn, Heesang; Aben, Dimaral; Kim, Kyujung; Kim, Jong-Man; Oh, Jin‐Woo; Shin, Dong‐Myeong; Hwang, Yoon‐Hwae

doi:10.1016/j.nanoen.2022.107909

Cited by 9 publications

(1 citation statement)

References 21 publications

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“…It can also tuned by varying the stiffness using materials [11]. Flexible nanogenerators equipped with quadrant electrodes have also been reported as a simple, efficient, and general method for decoupling in-plane flexoelectricity from the total electromechanical output [12]. Some studies have established a self-powered system driven by a wireless nanogenerator (NG) [13] Studies have concluded on the flexoelectricity that giant bend-induced polarization can be obtained without an inherently large flexoelectricity, which will help to reconcile some of the current discrepancies regarding the true magnitude of the flexoelectricity [14] Among the factors affecting the transducer are residual surface stress [15], linear elastic substrate and magnetic field [16], ferroelectricity, microstructure and micro-inertia effects [17], which can further improve the performance of PZT energy harvesters.…”

Section: Introductionmentioning

confidence: 99%

Double-armed cone-shaped flexoelectric transducer

et al. 2023

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Compared with a single energy harvester, this tuning fork double-armed cone-shaped flexure transducer can fundamentally solve the problems of high resonance frequency, low output efficiency, and narrow bandwidth of the flexure transducer. Since the transducer limits the clamping losses of the cantilever beam, it provides sufficient stiffness-mass balance to lower the resonance frequency of the system and extend the bandwidth. The tapered structure provides sufficient strain gradient for the flexoelectric effect, improving the output efficiency of the whole system. The vibration frequency of the tuning fork structure and the derivation of the bandwidth formula are analyzed theoretically, and then the electrode width and thickness of the cone structure are studied through simulation to analyze the transducer output response, resonant frequency, bandwidth, and output impedance.

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