Fig. 2
From: Atomic-scale mapping of hydrophobic layers on graphene and few-layer MoS2 and WSe2 in water
Two-dimensional (2D)-AFM xz force maps and force–distance curves of 2D materials–water interfaces. a Graphene. b Few-layer MoS2. c Few-layer WSe2. Scale bars represent 0.5 nm (both horizontally and vertically). d Force–distance curve for the graphene–water interface (extracted from a). e Force–distance curve for the MoS2-water (extracted from b). f Force–distance curve for the WSe2–water interface (extracted from c). The data show some oscillations in the force. Each peak is associated with a single molecular layer
