Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Green Laser-Induced-Graphene (LIG) Electronics by Direct Laser Writing on Wooden Materials

Han Ku Nam1, Dongwook Yang1, Truong-Son Dinh Le1, Younggeun Lee1, Byunggi Kim2, Young-Ryeul Kim1, Seung-Woo Kim1, Young-Jin Kim1,a

1Department of Mechanical Engineering, KAIST, 291, Daehak-ro, Yuseong-gu, Daejeon, 34141 Republic of Korea

2Department of Industrial Science, The University of Tokyo, 4𤖫 Komaba, Fe209, Meguro, Tokyo ,1538505, Japan


Wood is one of the most attractive material because it is abundant, eco-friendly, recyclable, and bio-degradable. However, while carbon neutrality policy is implemented, green material is re-spotlighted. Moreover, for using wood more effectively, people try to invent technologies of treating woods for overcoming the limitation of material. Here, we formed LIG (Laser-Induced-Graphene) electrodes on wooden material using ultrashort pulse laser. Ultrashort pulse laser is suitable for LIG formation because it can reduce the unwanted thermal ablation or thermal defects. Therefore, Wood surface is directly converted into LIG after irradiating by high repetition rate fs (femtosecond) laser without additional fire-retardant treatments in ambient air. Complex design of LIG electrodes can be easily patterned by fsLDW (Laser Direct Writing) technology. High quality three-dimensional porous with high electrical conductivity of LIG (~ 6 Ω/☐) is generated on wooden materials. Furthermore, LIG electrodes can be applied for smart green home applications, or smart wooden furniture.

Keywords: Laser-induced-graphene, Femtosecond laser, Direct writing technology, Lignocellulosic materials, Green electronics

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