Graphene Oxide Papers Modified by Divalent Ions—Enhancing Mechanical Properties <i>via</i> Chemical Cross-Linking

Abstract

Significant enhancement in mechanical stiffness (10-200%) and fracture strength (approximately 50%) of graphene oxide paper, a novel paperlike material made from individual graphene oxide sheets, can be achieved upon modification with a small amount (less than 1 wt %) of Mg(2+) and Ca(2+). These results can be readily rationalized in terms of the chemical interactions between the functional groups of the graphene oxide sheets and the divalent metals ions. While oxygen functional groups on the basal planes of the sheets and the carboxylate groups on the edges can both bond to Mg(2+) and Ca(2+), the main contribution to mechanical enhancement of the paper comes from the latter.

Keywords

Affiliated Institutions

• National Laboratory for Superconductivity CN
• Sabancı Üniversitesi TR
• Northwestern University US
• Korea Research Institute of Standards and Science KR
• Institute of Physics CN

Related Publications