After Yaghi and his colleagues made the breakthrough in 2005 on the synthesis of covalent organic framework (COF) materials , the study of COFs grows rapidly [2-4]. In two- and three-dimensional COFs, atoms are connected by various covalent bonds to construct the framework structure, giving this new kind of material broad prospective applications. Due to its high specific surface area, low density and diverse structure, COFs may be applied in the fields of gas storage [5, 6], catalysis , optoelectronic devices [8-12], etc. COFs can possess wide optical absorption in the visible range. Their highly ordered arrays may facilitate charge transport and exciton migration . Together with the presence of large pores in their structures, COFs might find important applications in photocatalysis [14-16].
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