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Rare earth luminescent material as well as preparation method and ammonia gas sensing application thereof

A luminescent material, fluorescence sensing technology, applied in luminescent materials, material analysis by optical means, material analysis, etc., to achieve good solubility and stability, improve luminous efficiency and thermal stability, and reduce application costs.

Pending Publication Date: 2021-12-17
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Europium complexes have been used as fluorescent materials for a long time, but there are very few applications of them in VOC detection.

Method used

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  • Rare earth luminescent material as well as preparation method and ammonia gas sensing application thereof
  • Rare earth luminescent material as well as preparation method and ammonia gas sensing application thereof
  • Rare earth luminescent material as well as preparation method and ammonia gas sensing application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Rare earth complex luminescent material Eu(TPM) 3 The preparation of (PBO) can be realized by the following steps:

[0043] 1. Weigh 0.180g / 0.4mmol of europium nitrate and dissolve it in 5mL of acetonitrile solution, stir for 5min to dissolve completely, and obtain colorless solution A;

[0044] 2. Weigh 0.2352g / 1.2mmol of TPM and 0.0820g / 1.2mmol of potassium hydroxide, mix and dissolve in a mixed solvent of 5mL acetonitrile and 1mL water, stir thoroughly for 5min to obtain a colorless and transparent solution B;

[0045] 3. Weigh 0.078g / 0.4mmol of 2-PBO and dissolve it in 5mL of acetonitrile solution, stir for 15min to obtain light yellow solution C;

[0046] 4. Add B to A, a white precipitate is formed, stir well, there is no obvious change, then add solution C to the mixed solution, stir well, and obtain a light yellow turbid liquid;

[0047] 5. Filtrate to obtain a light yellow filtrate and precipitate. The filtrate has a bright red light. The filtrate is rotary e...

Embodiment 2

[0049] Rare earth complex luminescent material Eu(TPM) 3 The preparation of (PBO) single crystal can be realized by the following steps:

[0050] 1. Take by weighing the powder 0.020g synthesized by the method of Example 1;

[0051] 2. Dissolve the powder in 10ml of dichloromethane, stir and dissolve at room temperature until clear, then filter;

[0052] 3. Put the light-colored filtrate obtained by filtration into a clean test tube, place deionized water in the lower layer of the test tube in advance as a precipitant, and semi-seal it for static crystallization;

[0053] 4. A few days later, a large number of light-colored crystals grew in the test tube. Take out the crystals and select the crystals with a size of 0.49mm × 0.35mm × 0.20mm for X-ray single crystal diffraction test, and analyze Eu(TPM) 3 (PBO) crystal structure. The crystal structure is shown in figure 1 with figure 2 shown.

Embodiment 3

[0055] Rare earth complex luminescent material Eu(TPM) 3 (PBO) paper-based fluorescent film preparation: weigh 0.0020g of Eu(TPM) 3 (PBO); add in the methylene chloride solution of 6ml, fully stir to make it fully and completely dissolve, obtain light-colored clear solution; Slowly add complex solution in the methylene chloride solution of PMMA, the solution is light-colored, clear and transparent. Then micro-spray the solution on the prepared test strips to make the sensitive surface of the fluorescent sensor, and wait for drying to obtain a ratio-type fluorescent test paper (paper-based fluorescent film); the paper-based fluorescent sensing film is sensitive to ammonia The response to gas is very sensitive, and fluorescence quenching will occur when there is a small amount of ammonia in the environment.

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Abstract

The invention discloses a novel rare earth ternary complex luminescent material, the molecular formula of the complex is Eu(TPM)3(PBO), and in the formula, TPM is 1, 1, 1-trifluoro-5, 5-dimethyl-2, 4-hexanedione; and PBO in the formula is a neutral heterocyclic ligand 2-(2-pyridine) benzoxazole. The compound is prepared by carrying out coordination reaction on europium nitrate, three times equivalent of TPM and one time equivalent of PBO ligand. The luminescent material disclosed by the invention is very good in luminescent property; the luminescent material has selective response to ammonia gas and high sensitivity, and quickly shows the sensing response characteristic of fluorescence quenching after being placed in an ammonia gas-containing atmosphere; and the material has good solubility and stability, can be easily prepared into a paper-based or quartz glass sheet-based fluorescence sensing film, the film also rapidly shows fluorescence quenching response which can be observed by naked eyes in an ammonia gas-containing atmosphere, and shows fluorescence sensing performance of rapid response and sensitive identification, and test paper can be flexibly manufactured into various required specifications, and can be used as a portable fluorescence sensing test paper device for ammonia gas detection.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to the application field of fluorescence sensing of luminescent materials. Background technique [0002] Due to their unique f electron layer structure, rare earth ions have the characteristics of long fluorescence lifetime, high quantum yield, narrow emission band and large Stokes shift, etc. It is a fluorescent sensor and a fluorescent probe used in biological systems and biomedical fields and has broad application prospects. [0003] At present, the problem of ammonia pollution in various environments cannot be ignored. As a colorless gas with a strong pungent odor, ammonia is lighter than air (specific gravity is 0.5), and the lowest detectable concentration is 5.3ppm. Ammonia is an alkaline substance that has corrosive and irritating effects on the skin tissues that it contacts. After being inhaled into the lungs, ammonia gas easily enters the blood ...

Claims

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Application Information

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IPC IPC(8): C07F5/00C09K11/06G01N21/64C08J5/18C08L33/12C08K5/00
CPCC07F5/003C09K11/06G01N21/643C08J5/18C07B2200/13C09K2211/182G01N2021/6432C08J2333/12C08K5/0091
Inventor 柴文祥王友裕宋莉
Owner CHINA JILIANG UNIV
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