Double layered dielectric elastomer by vapor encapsulation casting for highly deformable and strongly adhesive triboelectric materials

Title
Double layered dielectric elastomer by vapor encapsulation casting for highly deformable and strongly adhesive triboelectric materials
Authors
강종윤송현철김상태Hai Bo Xu김정훈황희재Deepam Maurya최덕균
Keywords
Triboelectric generator; Vapor encapsulation casting; Double dielectric layer; Porous structure
Issue Date
2019-08
Publisher
Nano energy
Citation
VOL 62-153
Abstract
Triboelectric generators (TEG), based on contact electrification and electro-static induction, has received a significant attention because of their numerous applications. To improve the electrified surface charge density in TEG, increasing the surface area of dielectric materials or forming internal hollow structures are typically employed to increase capacitance. However, the fabrication processes of such structures are complex and time-consuming. Here, we provide a facile and cost-effective synthesis method for the porous PDMS based TEG via a novel vapor encapsulation casting (VEC). The double dielectric layer composed of the porous and dense PDMS layers are formed in-site through VEC. The thickness and the thickness ratio of the double dielectric layer can be precisely controlled by adjusting the uncured PDMS thickness and vapor penetration depth. The double dielectric layer TEG (DTEG) exhibits the improved harvesting performance because the porous dielectric layer increases the capacitance and compressibility, while the dense layer passivates the fully open pores which reduce the charging surface area as completely opening through the dielectric layer without contacting the bottom electrode. We obtain the maximum output voltage of 345  V and short circuit current of 3  μA/cm2 from DTEG having 0.95 porous thickness ratio, resulting 330% enhancement in the power output as compared to the dense PDMS based TEG. We further investigate the performance of DTEG under various operating conditions. We also demonstrate the operation of Bluetooth distance/temperature sensors using capacitors charged by DTEG.
URI
http://pubs.kist.re.kr/handle/201004/69563
ISSN
2211-2855
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KIST Publication > Article
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