Ultratough Artificial Nacre Based on Conjugated Cross-linked Graphene Oxide

摘要

Natural nacre, which consists of almost 95 vol % inorganic content (calcium carbonate) and 5 vol % elastic biopolymers, possesses a unique combination of remarkable strength and toughness, which is attributed to its hierarchical nano-/ microscale structure and precise inorganic-organic interface. Inspired by the intrinsic relationship between the structures and the mechanical properties lying in the natural nacre, different types of nacre-like layered nanocomposites have been fabricated with two-dimensional (2D) inorganic additives, including glass flake, alumina flake, graphene oxide, layered double hydroxides, nanoclay, and flattened double-walled carbon nanotubes. Although great progress has been achieved in tensile mechanical proper-ties, in only very rare cases are artificial layered composites with excellent toughness are obtained. One of the most important causes is the relatively low interfacial strength between interlayers of artificial nacre. Recently, 2D graphene has attracted much research interest owing to its outstanding electrical, thermal, and mechanical properties,' and many graphene-based devices have been fabricated, such as bulk composites, one-dimensional fibers, super-capacitors.