Fig. 4: STM images showing different sizes of F-COF flakes.
From: Two-dimensional amine and hydroxy functionalized fused aromatic covalent organic framework
a STM image (36 × 36 nm2) acquired at a sample bias of –1.0 V and a tunneling current of 50 pA. b Image (9 × 9 nm2) acquired at a sample bias of –1.5 V and a tunneling current of 50 pA. Scale bar: a 7 nm; b 3 nm.
