NanoResCon2023: Using recycled energy in daily life (piezoelectric fiber)

 To enable the use of energy harvesting technologies that can recycle energy wasted or consumed in daily life, a research team led by Lim Sang-kyoo, senior researcher of the Division of Energy Technology at DGIST (President Kuk Yang), developed a piezoelectric polymer/ceramic composite fibre with a cross-sectional form that is uniformly controlled.

Through the piezoelectric effect of the material and the wearer's movement, piezoelectric fibre can generate electrical energy and power wearable electronic devices. The majority of piezoelectric fibres created to date, however, are made of nanofibers, which makes it challenging to control the shape of the fibres and makes the fibres weak, impeding their commercialization. There are also not many investigations on the connection between the piezoelectric performance and the geometry of the fibre material.

Using melt spinning technology, a research team under the direction of Lim Sang-kyoo, senior researcher of Division of Energy Technology, created PVDF (Polyvinylidene fluoride) fibre that contains barium titanate in a nano stick form by moulding it into the form of flowers and stems (daffodils, radish blossoms, papyrus stems, and sedge stems). By expanding the fiber's surface area and crystallinity at the same time, the team was able to improve the piezoelectric performance, which is helpful for producing electricity.

Additionally, the researchers used a high-speed camera to confirm the relationship between the specific surface area and the piezoelectric effect in light of the fiber's shape. The deformation caused by an external force causes the piezoceramic PVDF composite fibre to deform, producing an electrical signal. To examine the variation in piezoelectric performance based on the shape of piezoelectric ceramics, PVDF fibres containing barium titanate nanostructures in different shapes (spherical and stick shapes) were created. The team verified that it increases piezoelectric performance in favour of the arrangement and maximises the dielectric polarisation.

Senior researcher Lim Sang-kyoo stated, "It is anticipated that this research will eventually lead to the commercialization of high-performance fiber-type energy harvesting materials with enhanced fibre strength." 

In the meantime, the findings of this investigation were released in Nano Energy's June issue.

Source: DGIST provided the content (Daegu Gyeongbuk Institute of Science and Technology). There may be length and style edits to the content.


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