Figure 2. Illustration of chemical reaction mechanism from 1,3,5-trihydroxybenzene to 4–6 carbophene 2D crystal.

(a) The polymerization reaction could happen through intra-molecular dehydration of 1,3,5-trihydroxybenzene. (b) The polymerization reaction also could happen through inter-molecular dehydration between 1,3,5-trihydroxybenzene molecules. (c) With the joining of more 1,3,5-trihydroxybenzene molecules the fragments of 2D carbon crystal grows up quickly.