▎ 摘　　要

Nacre, due to its layered "brick-and-mortar" nanostructure together with the nanograins grafted on its "bricks" surface, so-called nanoasperities, exhibits a superior combination of mechanical strength and toughness, and constitutes an attractive model for strengthening and toughening artificial composites. However, the existing bioinspired graphene-based composites rarely address the nano-asperity aspect. Here, we fabricated an artificial nacre consisting of bricks of graphene oxide (GO) sheets, mortars of polyamide 6,6 (PA), and nanoasperities made of detonation nanodiamond (DND) particles. The DND particles were grafted into GO sheets through either amidation or esterification reactions, then the PA polymer chains were added and interacted with the oxygen groups in both GO and DND through hydrogen bonding. The resulting ternary system with a nacre-like hier-archical structure exhibits superior mechanical properties, and has tensile strength, Young's modulus, and toughness-1.4 times, 2.6 times, and-4 times higher than that of the GO control film.