(color online) Interaction of graphene with different substrates including various 2D materials. (a)–(k) Scatter diagrams of ω_2D versus ω_G acquired from the spatially resolved Raman maps on different substrates. The black solid lines represent the strain axes and the black dashed lines represent the doping axes. The black circles indicate the point corresponding to unstrained graphene. (l) Schematic of the influence of strain and strain-induced p- and n-doping on ω_2D and ω_G. Reproduced with permission from Ref. [90]. Copyright 2017, IOP Publishing.