Syntheses And Properties Of Novel Fluorescent Switching Materials

Fluorescent materials have received a lot of attention due to their wide applications in the fields of optical devices,biological imaging and sensing.In recent years,researches on fluorescent switch systems have gradually attracted the attention of researchers,and polyacids and metal-organic frameworks with excellent fluorescent properties have become research hotspots.This thesis is based on Prussian Blue/EuW₁₀,Luminol/EuW₁₀ and oxide/EuMOF composite materials,and has constructed a variety of fluorescent switch systems.The scanning electron microscope,transmission electron microscope,energy dispersive X-ray spectroscopy,X-ray diffraction,X-ray photoelectron spectroscopy and Fourier infrared spectroscopy were used to analyze the morphology,structure and composition of the prepared composite materials.And the prepared composites are used to study the fluorescent switching properties of small molecules or metal ions.The experimental results show that the Prussian Blue/EuW₁₀ composite dispersion can perform bispectral detection of hydrazine and hydrogen peroxide in both fluorescence and UV-visible spectra,and can realize the reversible conversion of fluorescence“on-off”;and Luminol/EuW₁₀ and The oxide/EuMOF two composite dispersions can detect the fluorescence spectra of metal ions such as Fe³⁺and Cr³⁺,respectively,and have certain selectivity.In the detection of small molecules or metal ions,the constructed fluorescent switch systems have achieved lower detection limits,making them potentially useful for trace analysis.In addition,through quantitative and qualitative analysis of fluorescence intensity,the constructed system has the advantages of simple operation method and short response time,and overcomes the defects of complicated operation,time-consuming and high cost in traditional instrument detection.The system constructed by the prepared composite has potential application prospects in the fields of environment and bioimaging.