Graphene nanosheet (GNS) films exhibit good thermal and electric conductivities due to low oxygen content and defect density. However, the weak interlayer interaction forces have resulted in poor mechanical properties and flexibility for GNS films. In order to meet this challenge, aramid nanofiber (ANF) is introduced into the GNS films by solution mixing, then a small amount of water is added to adjust the aramid nanofiber framework (ANFF) in the solution. The results indicate that adding a small amount of water into the aramid nanofiber/dimethyl sulphoxide (ANF/DMSO) suspension can recover the hydrogen bonds between ANF, promoting the ANF to form a stable framework. This design strategy leads to a delectate balance between flexibility and electric, thermal conductivities. With the improvement of water or ANFF content, the mechanical properties of GNS/ANFF composite films are gradually increased. And the electric and thermal conductivities are not influenced by the water content but decrease with the increasement of ANFF content. Most importantly, the flexibility of GNS films is greatly improved with little sacrifice of electric and thermal conductivities by adding only 2 wt% ANFF (GNS-2). The tensile toughness of GNS-2 composite films is dramatically improved from 30.8 to 108.7 kJ m⁻³, while the electric and thermal conductivities of GNS films are slightly dropped from 827 to 569 S cm⁻¹ and from 140 to 131 W m⁻¹ K⁻¹, respectively. Moreover, the excellent flexibility of the composite films can be maintained even after 1000 times of direct bending. The good over-all properties together with its easy preparation process endows GNS/ANFF composite films with potential applications in next-generation flexible electric devices.

石墨烯纳米片（GNS）膜由于氧含量低和缺陷密度低，因此具有良好的导热性和导电性。但是，弱的层间相互作用力导致GNS膜的机械性能和柔韧性差。为了应对这一挑战，将芳族聚酰胺纳米纤维（ANF）通过溶液混合引入GNS膜中，然后添加少量水以调节溶液中的芳族聚酰胺纳米纤维骨架（ANFF）。结果表明，向芳族聚酰胺纳米纤维/二甲基亚砜（ANF / DMSO）悬浮液中添加少量水可以恢复ANF之间的氢键，从而促进ANF形成稳定的骨架。这种设计策略导致了柔韧性与导电性，导热性之间的完美平衡。随着水或ANFF含量的提高，GNS / ANFF复合膜的力学性能逐渐提高。导电率和导热率不受水含量的影响，但随着ANFF含量的增加而降低。最重要的是，仅添加2 wt％的ANFF（GNS-2），即可大大降低GNS薄膜的柔韧性，而几乎不牺牲导电性和导热性。GNS-2复合膜的拉伸韧性从30.8 kJ m显着提高^-3时，GNS膜的电导率和热导率分别从827 S ^-1到569 S cm ^-1，从140 W ^{-1 -1 -1} K ^-1稍微降低。此外，即使在直接弯曲1000次之后，也可以保持复合膜的优异的挠性。良好的整体性能及其易于制备的工艺使GNS / ANFF复合膜具有在下一代柔性电子设备中的潜在应用。