Abstract

Two-dimensional polymers (2DPs) are emerging crystalline 2D organic material comprising free-standing, single-atom/monomer-thick, planar, and covalent networks with long-ranging structural order. Benefiting from their intrinsic porosity, crystallinity, and electrical properties, 2DPs have displayed great potential for separation, energy conversion and electronic fields. In this mini review, we aim to provide the recent progress in crystalline 2DPs films form synthesis strategies to characterization methods, as well as the future trends. We first present the synthesis strategy of single-crystalline 2DPs films including crystal engineering approaches and surface science. Also, we summarize the characterization methods of 2DPs films and highlight the advantages and limitations of different methods focusing on chemical bonding, morphology, and crystal structure. Finally, we will present the current challenges and trends regarding the future developments of crystallinity, monomer design, synthesis strategy and characterization.

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