A research team led by Lim Sang-kyoo, Principal Investigator of DGIST’s Energy Technology Division (Chairman Kuk Yang) has developed a polymer/ceramic piezoelectric composite fiber with a uniformly controlled cross-sectional shape to enable the use of energy recovery. technologies capable of recycling the energy wasted or consumed on a daily basis.
The piezoelectric fiber can generate electrical energy through the piezoelectric effect of the material and drive portable electronic devices through the movement of the wearer. However, most of the piezoelectric fibers developed so far are made of nanofibers, which means that it is difficult to control the shape of the fibers and the fibers are weak, which hampers its commercialization. Moreover, there are very few studies on the relationship between the shape of the fibrous material and the piezoelectric performance.
A research team led by Lim Sang-kyoo, principal investigator of the Energy Technology Division, has produced a PVDF (polyvinylidene fluoride) fiber that contains barium titanate in a nano-stick form by taking the form of flowers and stems (daffodils, radish flowers, papyrus stems, and sedge stems) using melt spinning technology and uniformly controlling their cross-sectional shapes. The team confirmed that it improves piezoelectric performance by increasing fiber surface area while simultaneously increasing fiber crystallinity, which is advantageous for generating electricity.
Also, the team confirmed the correlation between the specific surface and the piezoelectric effect depending on the shape of the fiber using a high-speed camera. The piezoceramic PVDF composite fiber generates an electric signal according to the deformation by an external force. PVDF fibers containing barium titanate nanostructures of different shapes (spherical and rod shapes) were produced to study the difference in piezoelectric performance depending on the shape of piezoelectric ceramics. The team confirmed that it maximizes the dielectric polarization and contributes to the improvement of the piezoelectric performance favorable to the arrangement.
Lead researcher Lim Sang-kyoo said, “It is expected that high-performance fiber-like energy harvesting materials with improved fiber strength may be commercialized through this research in the future.
Meanwhile, the results of this study were published in the June issue of Nano Energy.
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Materials provided by DGIST (Daegu Gyeongbuk Institute of Science and Technology). Note: Content may be edited for style and length.