fig6

Figure 6. Flexible substrate-induced strain. (A-B) Scheme for bending tests with two and four points; a graphene monolayer is positioned on a SU8-coated substrate in the center; (A-B): quoted with permission from Mohiuddin et al.^[32]; (C-D) Schematic diagram of fabrication methods of using PVA spin coating encapsulation and conventional direct exfoliation; (C-D): quoted with permission from Li et al.^[39]; (E) AFM topography image of wrinkled MoS₂ flake created by buckling-induced delamination; quoted with permission from Castellanos-Gomez et al.^[59]; (F) Schematic diagram of MoS₂ layers sandwiched between the piezoelectric substrate and graphene top electrode; quoted with permission from Hui et al.^[86]; (G) Schematic illustration of the lattice deformation in MoS₂ on glass spheres with varying diameters; quoted with permission from Zeng et al.^[87]. AFM: Atomic force microscopy.