Fig. 1: Structure of L-F6PEN nanosheets.
a STM micrograph of a complete monolayer of L-F6PEN adsorbed on MoS2 (U = 1.2 V, I = 40 pA). The large scan shows a smooth and closed film, the insets show the molecular packing motif. b Plot of the outer electrostatic potential of an L-F6PEN molecule (C22H8F6) probed by an electron (cf. ‘Methods’). Negative values are blue, positive ones red. The white area in the centre corresponds to the vdW box of the molecule. Carbon atoms are shown in grey, hydrogen atoms in white, and fluorine atoms in green. The orange line marks the L-axis of the molecule. c Illustration of the unit cell of the L-F6PEN (sub-) monolayer (light blue rhombus) together with denotations for the island edges. The long side edges (LEs) are marked red, the short side edges (SEs) in dark blue. The depicted 2 × 4 nanosheet was chosen arbitrarily and bears no specific meaning. d, e STM micrographs of islands of L-F6PEN adsorbed on MoS2 (top) created by direct deposition (nominal thickness 0.8 Å; U = 1.2 V, I = 40 pA) and thermal treatment after deposition of a monolayer (400 K for 1 min; U = 1.2 V, I = 50 pA), respectively. f, g Illustrations of the island shapes observed upon adsorption and desorption, respectively.
