Synthesis And Application Of Thin Films Of 2D Metal/Covalent-Organic Frameworks

Two-dimensional materials refer to a class of networks whose size can reduce to the limit of atomic layer thickness in one dimension and can be extended infinitely in the other two dimensions.Due to the great variety and unique physical and chemical properties,these materials have attracted extensive research attention.Among them,because of their tunable pore size,structure designable and rich active sites,two-dimensional covalent organic frameworks(2D COFs)and two-dimensional metal-organic frameworks(2D MOFs)are widely used in catalysis,separation,energy storage and other fields.Generally,powder are difficult to be further processed,which limits their application scope.At present,it is still a great challenge to prepare high quality and large area two-dimensional organic material films,which is very essential to use such new materials for practical equipment or product development.Therefore,the content of this thesis is focused on the synthesis of covalent organic framework films and metal organic framework films by different methods.The details are summarized as follows:1.We employed an difunctional groups monomer called1,6-bis(4-formylphenyl)-3,8-bis(4-aminophenyl)pyrene to prepare continuous and highly crystalline imine-linked Py-COF films.Due to the color change of imine-linked COFs exposed to acid,these films can be served as stable acidchromism sensors with rapid response,low detection limit and good repeatability.2.We synthesized hexaiminobenzene-based MOF Ni-HAB and Cu-HAB powder by solvothermal method and prepared high quality 2D metal organic framework films by stepwise layer-by-layer liquid phase epiaxy method.Besides,the magnetoresistance of these films as spacer layer of spin valves were measured.