Polymer Interfacial Self–Assembly Guided Two–dimensional Engineering of Hierarchically Porous Carbon Nanosheets

Two-dimensional (2D) carbon nanosheets with micro- and/or mesopores have attracted great attention due to unique physical and chemical properties, but well-defined nanoporous carbon nanosheets with tunable thickness and pore size have been rarely realized. Here, we develop a polymer-polymer interfacial self−assembly strategy to achieve hierarchically porous carbon nanosheets (HNCNS) by integrating the migration behaviors of immiscible ternary polymers with block copolymer (BCP)-directed self-assembly. The balanced interfacial compatibility of BCP al-lows the migration of BCP-rich phase to the interface between two immiscible homo–polymer major phases (i.e., ho-mo−poly(methyl methacrylate) and homo−polystyrene), where BCP-rich phase spreads thinly to a thickness of a few nanometers to decrease the interfacial tension. BCP-directed co-assembly with organic-inorganic precursors con-structs an ordered mesostructure. Carbonization and chemical etching yield ultra-thin HNCNS with hierarchical micropores and mes...