Method for preparing two-dimensional ordered mesoporous nanosheets by inorganic salt interface-induced assembly

A method for preparing two-dimensional (2D) ordered mesoporous nanosheets by inorganic salt interface-induced assembly, comprising the following steps:

• (1) preparing a nanomaterial precursor solution by using an amphiphilic block copolymer as a template;
• (2) introducing the nanomaterial precursor solution into a soluble inorganic salt serving as a substrate;
• guiding mass diffusion of the nanomaterial precursor solution in the soluble inorganic salt by a physical means of suction filtration or low-speed centrifugation to realize a single-layer dispersion interface on a surface of the precursor solution, wherein the suction filtration is less than 0.03 MPa, and the low-speed centrifugation is less than 4,000 rpm;
• (3) based on a principle of solvent evaporation-induced co-assembly (EICA), regulating a volatile organic solvent to evaporate in a gradient temperature-controlled manner, to realize self-assembly of a molecular precursor and the amphiphilic block copolymer on a surface of the soluble inorganic salt;
• (4) heating up to 300-600° C. in N2;
• carrying out calcination for 2-3 h to remove the amphiphilic block copolymer and to obtain a layered 2D ordered mesoporous organic/inorganic hybrid composite;
• heating up to 430-630° C. in air in a muffle furnace;
• carrying out calcination for 2-3 h to remove residual carbon and to obtain an ordered mesoporous structure;
• dissolving the soluble inorganic salt with an amount of deionized water to obtain a 2D single-layer ordered mesoporous nanosheet material.