Synthesis And Characterization Of Magnetic Fluorescent Nanoparticles And Fluorescent Films

Since fluorescence is regarded as one of the important properties ofmaterial, fluorescent materials show great advantages in a wide-rangeapplication in many fields such as chemistry, optics, medicine, lifescience and so on. Therefore it has attracted wide interest for a long time.In this paper, perylene derivatives were employed as raw materials,which showed excellent photo-and thermo-stability during thepreparation of magnetic fluorescent nanoparticles and fluorescent films.Relative performances of the obtained fluorescent materials werecharacterized respectively. The main contents are given as follows:1. The synthesis and characterization of the fluorescent magneticnanoparticles. Magnetic nanoparticles (MNP) were prepared byhydrothermal method. Subsequently SiO2coated MNP were obtained bythe hydrolyzation of tetraethyl orthosilicate (TEOS) on the surface ofFe3O4nanoparticles. The further surface modification of the SiO2coatedMNP were realized by the treatment with silane coupling agent.Carboxymethylated chitosan and perylene derivatives were introduced to the surface of the particles via chemical coupling. The characterization ofthe product particles proved the core-shell structure and the dualsignificant properties include magnetism and fluorescence.2. Preparation and characterization of fluorescent films. Viacrosslinking reaction, fluorescent films were obtained by crosslinkedpolyvinylpyrrolidone (PVP) as matrix and perylene derivatives aschromophore. Perylene derivatives were immobilized in the film throughintermolecular hydrogen bonding. The excellent fluorescent performanceof the product films were characterized, the preparation process wasdetailed described, which exhibited a novel method for the preparation ofPVP thin film. We hypothesized the formation mechanism of thecrosslinked PVP film and successfully achieved magnetic fluorescentcomposite materials, which would be applied for the further synthesis ofother type of fluorescent materials. The formation of the fluorescent PVPfilms opens a new way to synthesize multifunctional nano-scaledmaterials.