Yu Wenjie, Zhao Weiwei, Liu Xiaoqing
Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Mater Horiz. 2023 Nov 27;10(12):5597-5606. doi: 10.1039/d3mh01148h.
Welding is a key missing manufacturing technique in graphene science. Due to the infusibility and insolubility, reliable welding of macroscopic graphene materials is impossible using current diffusion-bonding methods. This work reports a pulsed laser welding (PLW) strategy allowing for directly and rapidly joining macroscopic 3D porous graphene materials under ambient conditions. Central to the concept is introducing a laser-induced graphene solder converted from a designed unique precursor to promote joining. The solder shows an electrical conductivity of 6700 S m and a mechanical strength of 7.3 MPa, over those of most previously reported porous graphene materials. Additionally, the PLW technique enables the formation of high-quality welded junctions, ensuring the structural integrity of weldments. The welding mechanism is further revealed, and two types of connections exist between solder and base structures, , intermolecular force and covalent bonding. Finally, an array of complex 3D graphene architectures, including lateral heterostructures, Janus structures, and 3D patterned geometries, are fabricated through material joining, highlighting the potential of PLW to be a versatile approach for multi-level assembly and heterogeneous integration. This work brings graphene into the laser welding club and paves the way for the future exploration of the exciting opportunities inherent in material integration and repair.
焊接是石墨烯科学中一项关键的缺失制造技术。由于石墨烯的不熔性和不溶性，使用当前的扩散结合方法无法实现宏观石墨烯材料的可靠焊接。这项工作报道了一种脉冲激光焊接（PLW）策略，该策略能够在环境条件下直接且快速地连接宏观三维多孔石墨烯材料。该概念的核心是引入一种由设计独特的前驱体转化而来的激光诱导石墨烯焊料，以促进连接。这种焊料的电导率为6700 S/m，机械强度为7.3 MPa，超过了此前报道的大多数多孔石墨烯材料。此外，脉冲激光焊接技术能够形成高质量的焊接接头，确保焊件的结构完整性。进一步揭示了焊接机制，焊料与基体结构之间存在两种连接方式，即分子间力和共价键。最后，通过材料连接制造出了一系列复杂的三维石墨烯结构，包括横向异质结构、双面结构和三维图案化几何结构，突出了脉冲激光焊接作为一种用于多层次组装和异质集成的通用方法的潜力。这项工作使石墨烯进入了激光焊接领域，为未来探索材料集成和修复中固有的令人兴奋的机会铺平了道路。
