Synthesis And Fluorescence Properties Of Metal-organic Frameworks/nature Polymer Compound Material

Luminescent metal-organic frameworks have wide application prospects in the fields of lighting,display,communication,imaging,fluorescence detection and sensing because of it's advantages of rich luminescence sites,wide luminous wavelength range,convenient multifunctional modification and so on.In the past,most of the MOFs materials remained as the bulk single crystal materials and large bulk crystalline materials,which greatly restricts its application in biology,biomedicine and thin film fields.On this account,luminescent MOFs is now one of the hot points of study in the world.Nowadays,Nano-MOFs and MOFs film not only to enhance the comprehensive performance of this materials,but also more conducive to the practical application and industrial production.In this paper,by using natural fibers or fabrics such as silk,silk fibroin powder,cotton fabric as substrate,different tetracarboxylic acid such as butane tetracarboxylic acid?BTCA?,pyromellitic acid?PMA?as bridging ligand,with the method of intelligent control of rare earth ions(Eu³⁺,Eu³⁺/Tb³⁺)mixing ratio,the effective control of the luminescent color of MOFs composite was realized.Besides,the compound materials made by chosing different substrate not only have good optical property,but also can be applied in detection field such as pH detection,copper ion detection.The main content of this paper are as follows:?1?We use silk fiber or fabric as substrate,tetracarboxylic acid?BTCA and PMA?as organic ligand with the method of mixing with different qualities of Eu???or different ratios of Eu???/Tb???to prepared novel luminescent silk fabric and generate tunable and multicolor light emitting materials.The results of fluorescence spectrum shows that the modified silk fiber and fabric have excellent optical properties.When exposed to UV light,silk will emit blue light,and Eu???will emit red light while the Tb???green light.By adjusting the quality of Eu???and the ratio of Eu???/Tb???,the intelligent control of their emission lights can be easily realized.Besides,this kind of fluorescent silk and fabric have excellent stability and color fastness to water and sunlight.?2?We use of molecular level of silk fibroin powder as polymer ligand for preparation of luminescent nano-Ln-MOFs.The silk fibroin powder was coordinated to lanthanide ions with pyromellitic acid?PMA?as bridging ligand,with hydrothermal method to prepare nano-Ln-MOFs materials exhibit rapid response in detection of pH.The results of SEM,XRD and particle size analysis shows that synthesis of nano-MOFs particle size can reach about 190 nm and have a certain crystallization performance;the results of fluorescence spectrum shows that nano-MOFs has excellent optical properties and can be used to detect pH.Especially at acidic conditions,the characteristic emission peak of europium ions is linear with pondus hydrogenii.Meanwhile,the peak intensity ratio of the characteristic peaks of europium and terbium?617nm,546nm?ions in Ln-MOFs IEu/ITb is also linear with pondus hydrogenii.?3?We use environmentally friendly renewable cotton fabric as substrate,butane tetracarboxylic acid bridging ligand with the method of mixing with different qualities of Eu???to prepared novel bonding type luminescent cotton fabric.However,the amount of Eu???in the form of chemical bonding on cotton cloth is limited,so we use the spin coating method at the modified cotton fabrics coated with a layer of nano-MOFs materials and have successfully prepared MOFs/cotton fabric composite membrane material with good optical property as well as function of copper ion detection.