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A rare earth-based metal-organic framework fluorescent nanomaterial and its preparation method and application

A technology of fluorescent nanomaterials and organic frameworks is applied in the field of fluorescent materials to achieve the effects of uniform morphology, uniform particle size distribution and obvious pore structure.

Active Publication Date: 2022-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a rare-earth-based metal-organic framework fluorescent nanomaterial and its preparation method and application. Both have major defects and other problems

Method used

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  • A rare earth-based metal-organic framework fluorescent nanomaterial and its preparation method and application
  • A rare earth-based metal-organic framework fluorescent nanomaterial and its preparation method and application
  • A rare earth-based metal-organic framework fluorescent nanomaterial and its preparation method and application

Examples

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Embodiment 1

[0043] Embodiment 1: A rare earth-based metal-organic framework fluorescent nanosphere is carried out according to the following steps:

[0044] (1) Prepare solution A: add ytterbium acetate, europium acetate, and terbium acetate into 10 mL of water (the molar ratio of ytterbium acetate, europium acetate, and terbium acetate is 1.2:0.2:0.45), stir evenly, and let stand at room temperature. A solution A with a concentration of 0.04 mol / L was obtained.

[0045] (2) Preparation of solution B: Dissolve 0.078g of trimesic acid in 10mL of DMF and ethanol mixed solvent (the volume ratio of DMF and ethanol is 1:1), stir evenly, and stand at room temperature to obtain a solution b.

[0046] (3) Preparation of fluorescent rare earth-based metal-organic framework nanosphere precursor: at room temperature, solution A was evenly added dropwise to solution B at a rate of 10 mL / h under high-speed stirring, and the reaction was continued for 3 hours to obtain a suspension C, wherein the sti...

Embodiment 2

[0061] The difference between this example and Example 1 is that in step (3), solution A is evenly added dropwise to solution B under high-speed stirring at a rate of 1 mL / h at room temperature, and the reaction is continued for 3 hours to obtain a suspension C, other conditions are all the same as in Example 1. Figure 10 It is a TEM photograph of the material prepared according to Example 3. Depend on Figure 10 It can be seen that the morphology of the material prepared by prolonging the dropping time is cubic, the edge length is about 300nm, and the surface is smooth. This example proves that the complexation of trimesic acid can be effectively adjusted by adjusting the dropping time, and then the morphology of the product can be adjusted. The emphasis of the present invention on the dropping method reflects the important role of the preparation method on the morphology and performance of the present invention. Figure 11 A among them is the fluorescence emission spectr...

Embodiment 3

[0063] The difference between this embodiment and Example 1 is: in step (1), solution A is the acetate (Yb:Tb:Ce=1.2:0.2:0.45) of ytterbium, terbium, cerium of 0.04mol / L, other conditions and Embodiment 1 is all the same. Figure 14 is the fluorescence emission spectrum of the sample prepared according to this embodiment under the excitation of 254nm ultraviolet light, A is the emission spectrum of the sample obtained in this embodiment, B is the emission spectrum of the sample obtained in this embodiment in water, and C is the sample obtained in this embodiment Emission spectra in ethanol. Depend on Figure 11 It can be seen that different fluorescent rare earths still have the ability to regulate energy transfer and fluorescence emission under the dual effects of inert rare earths and modification.

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Abstract

The invention discloses a rare earth-based metal organic framework fluorescent nanometer material, a preparation method and an application thereof, and belongs to the field of fluorescent materials. The preparation method comprises the following steps: (1) preparing a rare earth salt solution; the rare earth salt includes two luminescent rare earth elements and at least one non-luminescent rare earth element; (2) mixing the rare earth salt solution with a ligand solution, and then performing a solvent Thermal reaction to obtain rare earth-based metal-organic framework fluorescent nanomaterials. The fluorescent red-green ratio of the fluorescent nanomaterial of the present invention can be continuously changed from 0.79 to 2.73 with different proportions of water-ethanol systems, and can be used in multiple fields such as ethanol-water sensor elements, temperature sensor elements, humidity sensor elements, and anti-counterfeiting elements. It solves the problem that the current rare earth-based metal-organic framework fluorescence sensor can only change the fluorescence intensity but not the emission color, and the fluorescence intensity is affected by multiple factors such as temperature and chemical environment, resulting in low sensitivity and accuracy.

Description

technical field [0001] The invention belongs to the field of fluorescent materials, and in particular relates to a rare earth-based metal-organic framework fluorescent nanomaterial and a preparation method and application thereof. Background technique [0002] Rare earth-based metal-organic framework materials are typical complex fluorescent materials, which have the characteristics of high quantum efficiency and high fluorescence intensity, and have broad application prospects and research value in the fields of luminescent materials, sensors, and anti-counterfeiting. At present, the research on rare-earth-based metal-organic framework materials is still focused on the stage of fixing the basic materials to study their properties. The changes in the external environment have few changes in the materials and structures of rare-earth-based metal-organic frameworks, and the research on their fluorescence properties is even more lacking. . Studies have shown that the rational ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C09K11/06G01K11/16G01N21/64
CPCC08G83/008C09K11/06G01N21/6428G01K11/16C09K2211/182
Inventor 周博张鹏张勤远
Owner SOUTH CHINA UNIV OF TECH
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