Chen Yi, Lu Xupeng, Ma Ganggang, Kim Minseong, Yu Ruohan, Zhong Haosong, Chan Yee Him Timothy, Tan Min, Liu Yang, Li Mitch Guijun
Center for Smart Manufacturing, Division of Integrative Systems and Design, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong SAR, China.
State Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong SAR, China.
ACS Nano. 2025 Feb 11;19(5):5769-5780. doi: 10.1021/acsnano.4c17646. Epub 2025 Feb 3.
Laser-induced graphene (LIG) has been systematically investigated and employed because of the spartan laser synthesis and functional three dimensional (3D) foam-like structures. However, thermally induced deformation during laser processing is generally undesirable and, therefore, strictly suppressed. This work introduces a novel laser-guided self-assembly approach integrated into the fabrication of LIG to generate multiscale 3D graphene foam structures in a single step. Leveraging the photothermal effects of laser ablation on polyimide films, we achieve concurrent LIG production and self-assembly, enabling the transformation of two dimensional films into 3D micro-rolls. The process is finely tuned through interface modification and optimized laser parameters, allowing precise control over the geometry of the resulting structures. Systematic investigations reveal that varying laser power and line spacing effectively adjust the diameters of the LIG micro-rolls. Characterization indicates that the LIG micro-rolls can be fabricated with very large curvature and limited internal space, enhancing the potential for microscale applications. Furthermore, our laser strategy facilitates the creation of symmetric, asymmetric, and double-tube micro-rolls, underscoring its design flexibility. This work highlights the potential of the laser-guided self-assembly strategy in graphene nanomaterials and miniaturized applications, which has been exemplarily verified through the LIG micro-roll supercapacitors.
由于激光合成过程简单且能形成功能性三维（3D）泡沫状结构，激光诱导石墨烯（LIG）已得到系统研究并被广泛应用。然而，激光加工过程中的热致变形通常是不可取的，因此需要严格抑制。这项工作引入了一种新颖的激光引导自组装方法，该方法集成到LIG的制造过程中，能够一步生成多尺度3D石墨烯泡沫结构。利用激光烧蚀聚酰亚胺薄膜的光热效应，我们实现了LIG的同步制备和自组装，使二维薄膜转变为3D微卷。通过界面改性和优化激光参数对该过程进行精细调整，从而能够精确控制所得结构的几何形状。系统研究表明，改变激光功率和线间距可有效调节LIG微卷的直径。表征结果显示，所制备的LIG微卷具有非常大的曲率和有限的内部空间，增强了其在微尺度应用中的潜力。此外，我们的激光策略有助于制造对称、不对称和双管微卷，突出了其设计灵活性。这项工作凸显了激光引导自组装策略在石墨烯纳米材料和小型化应用中的潜力，通过LIG微卷超级电容器已得到了示例性验证。
