The Preparation And Application Of Two-Dimensional ZIF-L Multi-Layered Metal-Organic Framework Materials

Metal-organic framework material(MOF)is a kind of porous crystal material formed by combination of organic ligands and inorganic metal ions or metal clusters through coordination bonds.Because MOF itself has high porosity,high specific surface area,good crystal stability,suitable nano-size and other factors,it has wide application prospects in catalysis,energy,medicine,sensing,gas separation and adsorption,etc.MOF has received extensive attention from researchers.In this paper,a classic two-dimensional metal organic framework(2D-MOF)ZIF-L as the research object,using different conditions and processes for its epitaxial growth,and then get a series of two-dimensional organic metal with different morphology,structure and function Skeletal materials.Moreover,we conducted in-depth analysis of the relationship between the reaction process and the topography.The main content of the paper is as follows:Firstly,we prepared a novel three-layer sandwich-like metal-organic framework material,ZIF-L(3L).The new structure of the MOF is based on ZIF-L-Co,and the ZIF-L crystals are grown again on both surfaces by in-situ crystal epitaxial growth.In this way,a new type of MOF-on-MOF material was obtained.Its appearance and structure were characterized.Its growth process was monitored,stability was studied,and the growth mechanism was discussed.Next,based on the obtained three-layer sandwich ZIF-L(3L),we used the in-situ crystal epitaxy to continue growth.The ZIF-L(5L),ZIF-L(7L)and ZIF-L(9L)materials with five-,seven-,and nine-layer sandwich structures were successfully prepared.Its morphology and structure were characterized,and the formation mechanism was studied by using ZIF-L(7L)as an example.Finally,we look forward to the application prospects of the material in the controlled packaging of nanoparticles and the direction of gas separation and adsorption.