Fig. 4.

Programmable 2D chain-growth copolymerization of DHT nanoplatelets. a Schematics of structures (left), sequences (middle), and simplified cartoons of two monomers C (blue) and D (pink) and initiator strand (I’). b 2D chain-growth supramolecular copolymerization of monomers C and D initiated with I’. Copolymerization starts with the strand displacement reaction of initiator I’ with monomer c3, exposing the loop sequence of c4 to further invade the hairpin domain of D and open the d3. The opened d3 contains an identical toehold to I’, which can further activate the monomer C. Meanwhile, supramolecules are assembled with the associations of monomers’ corner sticky ends in a direction perpendicular to the helical axis. c Atomic force microscopy (AFM) images of 2D DHT nanoplatelets. Scale bars: 200 nm. (Inset) Zoomed-in AFM image. Dashed line squares indicate monomers C (blue) and D (red). Scale bars: 50 nm