The manufacturing of three-dimensional (3D) graphene monolith with high mechanical and electrical performance has become an urgent issue in view of their potential applications in energy and electronics fields. Due to the structure rigidity and poor liquid-phase processing capability of graphene sheets, it is challenging to fabricate 3D graphene monolith with high mechanical performance, including strength, toughness and resiliency. Graphene oxide (GO) shows an improved dispersibility and reduction-restorable conductivity, which enables it to effectively balance the processing and comprehensive performances of graphene monolith. Here, we demonstrate a strategy to fabricate high-performance, shape-designable 3D graphene monolith through a 3D printing method based on large-sized graphene oxide (LGO) fluid ink. The concentration of the LGO ink for printing is as low as 20 mg/mL. The resulting monolith exhibits low density (12.8 mg/cm³), high electrical conductivity (41.1 S/m), high specific strength (10.7 × 10³ N·m/Kg) and compressibility (up to 80% compressive strain). Such a 3D printing technique enables plenty of complicated monolith structures and broadens the application range of graphene.

考虑到它们在能源和电子领域的潜在应用，具有高机械和电气性能的三维（3D）石墨烯整料的制造已成为迫在眉睫的问题。由于石墨烯片的结构刚性和较差的液相处理能力，制造具有高机械性能（包括强度，韧性和弹性）的3D石墨烯整料是具有挑战性的。氧化石墨烯（GO）显示出改善的分散性和还原性可恢复的电导率，从而使其能够有效地平衡石墨烯整料的加工性能和综合性能。在这里，我们演示了一种通过基于大型氧化石墨烯（LGO）流体墨水的3D打印方法来制造高性能，形状可设计的3D石墨烯整体的策略。用于打印的LGO墨水浓度低至20 mg / mL。所得整料显示出低密度（12.8 mg / cm³），高电导率（41.1S / m），高比强度（10.7×10 ³  N·m / Kg）和可压缩性（高达80％的压缩应变）。这种3D打印技术可实现大量复杂的整体结构，并拓宽了石墨烯的应用范围。