▎ 摘　　要

This paper reports an artificial nacre-like composite paper based on sodium alginate (SA) and graphene oxide (GO) by lanthanide ions cross-linking. SA-coated GO were used as building "bricks and mortar" and self-assembled into aligned GO/SA composite hydrogel by the coordination of lanthanide ions. Subsequently, the hierarchical GO/SA composite paper was formed under evaporation. Four types of lanthanide ions (Nd3+, Ce3+, Gd3+, and Yb3+) were used to fabricate hierarchical GO/SA composite papers. The lanthanides enhanced the mechanical properties of the GO/SA composite papers (strength of 255.8 +/- 8.52 MPa and toughness of 4.83 +/- 0.28 MJ m(-3)) and endowed the papers with high stability. Due to the anisotropic nature along parallel and perpendicular directions, the hierarchical GO/SA composite papers exhibited a specific thermal conductivity. These features greatly expand the application of the composite papers, which are believed to show competitive advantages in aerospace, electronic devices, and thermal interface materials. (C) 2017 Published by Elsevier Ltd.