Sodium yttrium tetrafluoride/ ferroferric oxide/carbon multifunctional nano material and preparation method thereof

Abstract

The invention relates to preparation of an inorganic nano material and discloses a sodium yttrium tetrafluoride / ferroferric oxide / carbon multifunctional nano material and a preparation method thereof. A chemical expression of the nano material is as follows: NaYF4:Yb, Er / Tm@Fe3O4@C. The preparation method of the sodium yttrium tetrafluoride / ferroferric oxide / carbon multifunctional nano material comprises the following steps: A, uniformly dispersing up-conversion fluorescent nanoparticles into cyclohexane; B, mixing dispersion liquid with acetone; C, adding dicyclopentadienyl iron into mixed liquid, and sufficiently stirring; D, carrying out ultrasonic action onto the mixed liquid after the dicyclopentadienyl iron is dissolved; E, slowly adding hydrogen peroxide into the mixed liquid, and stirring uniformly; F, transferring the mixed liquid into a high-pressure reaction kettle which takes tetrafluoroethylene as a substrate, and carrying out solvothermal reaction; and G, after the solvothermal reaction is ended, naturally cooling, centrifuging and cleaning. According to the preparation method disclosed by the invention, package of Fe3O4 on the surface of an up-conversion material is realized by one step, and a carbon layer is formed on the surface of the up-conversion material, so that the material has hydrophilicity and high biocompatibility.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic nanometer materials, in particular to multifunctional nanometer materials and preparation methods thereof. Background technique [0002] Up-converting fluorescent materials are a class of materials that can be excited with long-wavelength light to emit short-wavelength light. Among them, "near-infrared-visible light" type up-conversion nanomaterials have attracted much attention. This kind of material can emit a variety of colors of visible light under the excitation of near-infrared, and shows a wide range of application prospects in the field of biomedicine. It has significant advantages such as high detection depth, small background interference, and high sensitivity. Currently, rare earth-doped sodium yttrium tetrafluoride (NaYF 4 ) is considered to be the most efficient upconversion nanomaterial. Nano ferric oxide (Fe 3 o 4 ) has the characteristics of superparamagnetism...

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Problems solved by technology

For example, Li Fuyou et al. NaYF 4 Nanocrystals are seed crystals, and Fe epitaxially grows on the surface 3 o 4 shell, but the obtained material is hydrophobic, and subsequent surface modification work is required; Yan Chunhua et al. 4 Using dicarboxylic acid ligands on nanocrystals, small Fe can be grafted on their surface 3 o 4 Nanoparticles, but the chemical stability of this structure is not high; some scholars also use SiO 2 encapsulation method, simultaneously encapsulating two kinds of nanoparticles in a large SiO 2 In the particle, but its disadvantage is that the proportion of functional materials is low, the material structure is irregular, and uniform packaging cannot be achieved

[0004] From the perspective of the chemical synthesis process, the above preparation methods are to prepare two functional materials under certain conditions, and then combine them. The preparation process is cumbersome.

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