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Bio-Design and Manufacturing  2022 Vol.5 No.4 P.700-713

http://doi.org/10.1007/s42242-022-00197-0


Laser-induced jigsaw-like graphene structure inspired by Oxalis corniculata Linn. leaf


Author(s):  Wentao Wang, Longsheng Lu, Xiaoyu Lu, Zhanbo Liang, Biao Tang & Yingxi Xie

Affiliation(s):  School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China; more

Corresponding email(s):   xieyingxi@scut.edu.cn

Key Words:  Laser-induced graphene, Oxalis corniculata Linn., Bionic, Multistage structure, Superhydrophobic surface


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Wentao Wang, Longsheng Lu, Xiaoyu Lu, Zhanbo Liang, Biao Tang & Yingxi Xie. Laser-induced jigsaw-like graphene structure inspired by Oxalis corniculata Linn. leaf[J]. Journal of Zhejiang University Science D, 2022, 5(4): 700-713.

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Abstract: 
The laser scribing of polyimide (PI, Kapton) film is a new, simple and effective method for graphene preparation. Moreover, the superhydrophobic surface modification can undoubtedly widen the application fields of graphene. Herein, inspired by the hydrophobic and self-cleaning properties of natural oxalis corniculata Linn. leaves, we propose a novel bionic manufacturing method for superhydrophobic laser-induced graphene (LIG). By tailoring the geometric parameters (size, roughness and height/area ratio) and chemical composition, the three-dimensional (3D) multistage LIG, i.e., with micro-jigsaw-like and porous structure, can deliver a static water contact angle (WCA) of 153.5° ± 0.6°, a water sliding angle (WSA) of 2.5° ± 0.5°, and great superhydrophobic stability lasting for 100 days (WCAs ≈ 150°). This outstanding water repellency is achieved by the secondary structure of jigsaw-like LIG, a porous morphology that traps air layers at the solid–liquid interface. The robust self-cleaning and anti-stick functions of 3D bionic and multistage LIG are demonstrated to confirm its great potential in wearable electronics.

华南理工陆龙生、谢颖熙等 | 受酢浆草拼图结构启发的激光诱导三维多级石墨烯及其表面超疏水应用

本研究论文聚焦激光诱导三维多级石墨烯及其表面超疏水应用。激光划刻聚酰亚胺(PI, Kapton)薄膜是制备石墨烯的一种简单有效的新方法,在此基础上,构筑超疏水表面无疑可进一步拓宽其应用领域。本文从天然酢浆草叶片的疏水和自清洁特性出发,提出一种超疏水激光诱导石墨烯(LIG)的仿生制备方法。通过优化先刻蚀、后诱导生长的二步激光工艺,可以调整LIG的几何参数(尺寸、粗糙度和高度/面积比)和化学组成,得到三维多级仿生结构LIG,包括拼图结构和多孔结构。三维多级仿生结构LIG的静水接触角(WCA)为153.5°±0.6°,水滑动角(WSA)为2.5°±0.5°,超疏水稳定性可维持100天(WCA≈150°)。研究结果表明这些优异的拒水性能主要是由拼图状LIG的多孔结构主导,可以在固液界面捕获空气层,赋予LIG强大的自清洁和防粘功能,证实了其在未来生物医学器件中的巨大应用潜力。

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