Fig. 2: AA eclipsed/shifted stacking and their dynamic stacking processes.
From: Moiré two-dimensional covalent organic framework superlattices
a, Chemical structure of the AA-stacked (eclipsed/translated) 2D COFs based on boroxine chemistry. b, High-resolution STM image revealing the partial coverage of the second layer on the first layer 2D COFs. c, FFT of b. Hexagonal feature of the 2DPs is outlined with white circles. d, Height profile extracted from the white line in b. e, Low-dose HRTEM image of AA eclipsed/shifted stacking 2D COFs along the <001> zone axis. f, FFT of e. g, Contrast transfer function corrected image of the white square area in e. h, Simulated projected electrostatic potential with a point spread function width of 1.0 Å. i–l, Large-scale STM images obtained during the vertical stacking and in-plane polymerization processes at time t = 0 min (i, j) and 16.2 min (k, l). Imaging conditions: 40 nm × 40 nm, Vs = 0.4 V, It = 0.08 nA (b); 500 nm × 500 nm, Vs = 0.4 V, It = 0.08 nA (i, k); 150 nm × 150 nm, Vs = 0.4 V, It = 0.08 nA (j, l); 18 nm × 18 nm (e); 3 nm × 3 nm (g).
