Figure 1: Nanoindentation experiments and sample preparation.
From: Effect of defects on the intrinsic strength and stiffness of graphene
(a) Schematic representation of atomic force microscopy (AFM) nanoindentation test on suspended graphene sheets with defects. Graphene sheet is suspended over a hole with diameters ranging from 0.5 to 5 μm and depth of ~1 μm. (b) Optical micrograph of exfoliated graphene sheets suspended over holes. White-dashed line indicates the boundary of each layer. (c) Non-contact mode AFM image of suspended graphene sheet obtained from the red square box region marked in (b). Scale bars, 3 μm.
