Rare Earth, dye-doped SiO_2-based nano-particle preparation and optical properties of

Title: Rare Earth, dye-doped SiO_2-based nano-particle preparation and optical properties of
　　Author: Yang Xingwang
　　Degree-granting unit: Jinan University
　　Keywords: composite nanoparticles;; surface plasmon resonance;; emission spectra;; fluorescence enhancement
　　Summary:
　　In recent years, Eu3, Tb3-doped SiO2-based nano-particles with Rhodamine B-doped SiO2-based nano-particles in biological sensing, biomedical, micro-sensors, fluorescent labels and a wide range of application areas, causing researchers Magnetic lifter great interest. With the rise of nanotechnology, Eu3, Tb3-doped SiO2-based nano-materials and Rhodamine B-doped SiO2-based nano-materials has become a new fluorescence enhancement in the hot material, especially as biological labels in biological detection and biomedical fields has broad application prospects. This article was prepared Eu3, Tb3-doped SiO2-based nano-particles and rhodamine B-doped SiO2-based nano-particles, combined with transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-Vis-NIR spectrophotometer, RF-5301 / pc ray fluorescence spectrometer on samples of morphology, composition and optical properties were studied. Following major elements:
　　The first part is to improve the base-catalyzed prepared Eu3, Tb3-doped SiO2-based nano-particles, TEM results show that the nanoparticles are spherical, monodisperse, good particle size distribution is uniform. UV-Vis-NIR test results show that the electronic structure corresponding to particles in the transition f → f electronic Eu3 in the visible range has a strong absorption peak. XRD results show that the annealing temperature is below 1000 ℃, 20 = 22.15 ° in the vicinity of a broad diffraction peaks, mainly in the amorphous SiO2 materials; when the http://www.999magnet.com/products/131-magnetic-lifter annealing temperature of 1000 ℃ or more, can clear the map in see some sharp peaks appear, SiO2 from the amorphous into the crystalline structure. RF-5301/pc test results show that, Eu3, Tb3-doped SiO2-based nano-particle spectrum of launch as Eu3, Tb3 doping concentration is changed. Annealing temperature from 200 ℃ to 1200 ℃, the material structure from amorphous to crystalline state, the peak position is essentially the same, their emission spectra influenced by the material structure, the emission intensity at 800 ℃ maximum.
　　Stober method combines the use of the second part of the redox reaction, in Rhodamine-doped silica ball silver particles deposited on the surface, to be rhodamine B-doped SiO2-based nano-materials. UV-Vis-NIR test results showed that with increasing silver shell, plasma absorption spectrum becomes broad and strong, with a significant tunability, and the absorption peaks, and no apparent movement. RF-5301/pc test results show that the rhodamine B-doped SiO2-based nano-particles, SiO2 layer is wrapped with silver shell rhodamine B molecules in providing a suitable distance, and grew up in silver shell can be more silver shell around the large enhancement of local electromagnetic fields in order to achieve the silver shell of Rhodamine B-doped surface molecule fluorescence enhancement.
　　Degree Year: 2010