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Multilayered Ferroelectric Hybrid Materials for Enhanced Triboelectric Nanogenerators

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Title
Multilayered Ferroelectric Hybrid Materials for Enhanced Triboelectric Nanogenerators
Author
Park, Yoojeong
Advisor
Ko, Hyunhyub
Keywords
triboelectric nanogenerator, multilayered film, surface charge density, surface potential, polarization, ferroelectric material
Issue Date
2019-08
Publisher
Graduate School of UNIST
Abstract
The flexible triboelectric nanogenerators (TENGs) enabling high power generation have been a great attention for applications in self-powered sensors and wearable devices. Conventionally, many researches have employed inorganic ferroelectric materials with high dielectric constant into elastomers or ferroelectric polymer matrix for high-performance TENGs. However, randomly dispersed inorganic materials in composites prevent the effective stress-transfer for the stress-induced polarization of ferroelectric composites. Here, we introduce novel high performance TENGs based on multilayered ferroelectric organic/inorganic materials. The multilayers consisting of PVDF-TrFE layers and aligned BTO nanoparticle (NP) interlayers can increase the effective stress-induced polarization, which improves the surface potential for the enhanced triboelectric output performances. This surface potential is additionally enhanced by the electrical poling process. As a result, the output current density of multilayered TENGs with aligned BTO NPs is increased ~ 47% compared to the single composite TENGs with randomly dispersed BTO NPs. Furthermore, the multilayered TENGs exhibit tunable frequency sensing capability by controlling the number of multilayers, providing a possible application in acoustic sensors with frequency selectivity. Our findings on multilayered TENGs would offer a great potential for self-powered sensors and wearable electronics.
Description
Department of Chemical Engineering
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