Figure 13: (a) Optical micrograph of MoS2 layer [219] (b) AFM of MoS2 [219], (c) AFM of graphene [217], (d) optical micrograph of graphene [217], (e) FQM image of graphene using PVP/fluorescein [217]. Scale bars are 10 μm. Reprinted by permission of ACS Publishers.