Buckling Behavior of Few-Layer Graphene on Soft Substrate

Abstract

The buckling behavior of graphene on soft films has been extensively studied. However, to avoid graphene fracture, most studies focus only on the primary buckling behavior induced by tiny compression. Here, the buckling behavior of monolayer, three-layer, and four-layer graphene on soft films is systematically studied in the experiment under large compression. The cross-sections of buckling patterns in these few-layer graphenes are provided, which depend on focused ion beam (FIB) technology. More significantly, the moduli of few-layer graphene are calculated based on the buckling behavior. We demonstrate that the modulus, 1.12621 TPa, is independent of the number of graphene layers if the number is less than four. Our investigations are crucial for the application of two-dimensional (2D) materials into flexible hybrid electronics, bionics, and various other stiff/soft bilayer systems.

Recent advances in density functional theory approach for optoelectronics properties of graphene

“…Despite the surge in 2D materials, graphene stands out among them for having exceptional electronic, optical, and thermal properties [ 14 , 15 ]. It has very high carrier mobilities ( 200,000 ) [ [16] , [17] , [18] ], unusual linear dispersion around the Dirac point [ 19 , 20 ], ultrahigh thermal conductivities ( ) [ [21] , [22] , [23] ], room temperature ballistic carrier transport [ 24 , 25 ], large surface area (2630 ) [ [26] , [27] , [28] ], a Young's Modulus of 1 TPa [ 29 , 30 ], broadband optical absorbance (2.3%) [ [31] , [32] , [33] ], and a robust crystal structure, all of which reveal the material's high quality and suggest its prospects for future optoelectronic devices [ [34] , [35] , [36] ]. However, its use in optoelectronics is limited due to its zero bandgap and relatively poor structural tunability [ [37] , [38] , [39] ].…”