부산대학교 도서관

In this study, Fe_3O_4-SiO_2-R6G (FSR) composite structure hollow spheres were developed by combining the spray pyrolysis process and the sol-gel method. First, micron-sized Fe_3O_4 hollow spheres were prepared, then coated with R6G-doped SiO_2 shells, with a doping concentration ranging from 5×10^(-4)M to 5×10^(-2)M. The crystal structure, microstructure, magnetic properties, and luminescent properties of the composite were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), photoluminescence spectrometer (PL), laser scanning Confocal microscope and vibrating sample magnetometer (VSM). It demonstrated that the shell thickness increases with the concentration of R6G, ranging from 23 nm to 50 nm. The spherical shell has a two-layer structure, the inner layer is composed of Fe_3O_4 crystalline particles, and the outer layer is SiO_2 amorphous film. The samples are all ferromagnetic, and the saturation magnetization can reach up to 50 emu/g, which decreases with the increase of doped R6G concentration. The sample emits fluorescence with a wavelength of 550 nm when excited by light with a wavelength of 488 nm, and the emission intensity increases as the concentration of doped R6G increases. In addition, the R6G in the shell was indicated to be in the form of a monomer according to the luminescent properties.