Finite temperature effect on mechanical properties of graphene sheets with various grain boundaries
Ge Yong†, , Sun Hong-Xiang, Guan Yi-Jun, Zeng Gan-He
       

Geometric structures of grain boundaries at different values of tilt angle θ: (a) 5.5° and (b) 13.2° in the zigzag-oriented graphenes, (c) 15.8° and (d) 28.7° in the armchair-oriented graphenes.