Mechanical properties of bilayer graphene sheets coupled by sp3 bonding

✍ Scribed by Y.Y. Zhang; C.M. Wang; Y. Cheng; Y. Xiang

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 446 KB
• Volume: 49
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/j.carbon.2011.06.058

✦ Synopsis

The mechanical properties, such as the Young's modulus, the interlayer shear modulus and the ultimate tensile strength, of bilayer graphene sheets (GS) coupled by sp 3 bonding are investigated by molecular dynamics simulations. These mechanical properties are found to be sensitive to the presence of sp 3 bonds in the bilayer GS. The sp 3 bonds exert a strengthening influence on the interlayer shear modulus as well as the load transfer rate, thereby enhancing the stability capacity of GS under axial compression. However, the presence of sp 3 bonds also leads to a reduction in the Young's modulus, ultimate tensile strength and the associated facture strain. The adverse and strengthening effects induced by the sp 3 bonds are also strongly dependent of their distributions. Simulation results suggest that a small amount of sp 3 bonds can be introduced in GS to improve its load transfer rate and stability substantially at the expense of a marginal deterioration in the Young's modulus and tensile strength.