Controlled Synthesis And Gas Sensing Applications Of UiO-66 Metal-Organic Framework

The metal organic framework(MOFs)is a porous,three-dimensional framework material formed by self-assembly of metal ions or metal ion clusters and organic ligands.MOFs materials have a large specific surface area,tailorable surface chemical properties and pore size,high thermal stability and chemical stability.So MOF applications are also very wide.Beyond their pore structures and surface chemistry,the precise controls over other attributes of metal-organic frameworks(MOFs)such shapes,sizes and defects are also favorable to their fundamental studies and applications but still remain challenging.Herein,we reported an acid/base co-modulation strategy to the large-scale synthesis of monodisperse UiO-66 crystals with acetic acid and triethylamine.And we can also control the crystal defect.On this basis,we discussed the impact of surfactants.Than the films with high orientation were formed by self-assembly using monodispersed MOF crystals.They can use as gas and solvent vapor sensors.The specific content is divided into the following aspects:(1)We use the solvent heat synthesis method to synthesis of monodispersed UiO-66 crystals in lager scale volume with acetic acid and triethylamine,and the size of UiO-66 crystals showed regular changes with the concentration of triethylamuine.And found that PVP in acetic acid and triethylamine system can also control the size of UiO-66 crystal.(2)Defects of the obtained UiO-66 crystal were studied by NMR,IR,EDX,TGA and nitrogen adsorption.(3)The UiO-66 films were prepared by two different methods,and their applications in gas sensing were explored.The effects of MOF morphology,size and defects on the sensing properties were also studied.