Three-Dimensional Ordered Superstructure Chlorination Gas Vapor Sensing Based On MOF

Carbon tetrachloride is one of the typical representative harmful gases in chlorinated gases.It is also a typical representative of organic volatile gases(VOCs).In the context of increasing air pollution,steam sensing studies of such gases It has great environmental and economic significance.Metal Organic Frameworks(MOFs)have been extensively studied for their adsorption of such gases due to their structural characteristics,and more research groups are conducting their sensing studies.The colloidal crystal photonic crystal material has been widely concerned in the sensing field due to the existence of its own photonic band gap.Combining the superior properties of the two materials,a new type of composite material has been developed for the research of vapor sensing of chlorinated gases.Zeolite Imidazolate Frameworks(ZIFs)are a class of materials with better thermal stability in MOFs.Polystyrene beads have been extensively studied for sensing in photonic crystal materials.Taking these two materials as the core,it is expected to develop a more efficient and simple carbon tetrachloride vapor concentration detection system for carbon tetrachloride vapor sensing research.In this paper,the ZIF-8 crystal with fixed morphology was prepared by using the surfactant cetyltrimethylammonium bromide(CTAB)to control the morphology and size of ZIF-8 crystals.The ZIF-8 three-order ordered superstructure(FT-ZIF-8)with fixed morphology was prepared.The polystyrene beads with surface-coated ZIF-8 were prepared by using polystyrene beads as template.Structure(PS@ZIF-8);two materials were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).Both structures were inherited from the superior adsorption properties of MOFs and the optical properties of colloidal crystal materials.The sensing properties of these two materials on carbon tetrachloride were investigated.The experimental results show that the two materials have excellent selectivity to carbon tetrachloride,and the response time is short(2s),stability and reproducibility are strong,and the carbon tetrachloride vapor concentration and the detected optical signal show Excellent linear relationship enables real-time steam concentration monitoring of chlorinated gases represented by carbon tetrachloride.Finally,combined with the experimental results and related data,a chlorinated gas vapor sensing monitoring system capable of realizing the above functions was developed.The system is simple to construct and low in cost and is expected to be produced on a large scale.