Fluorescent probe material as well as preparation method and application thereof

A technology of fluorescent probes and nanocrystals, applied in the field of fluorescent probe materials and their preparation, can solve problems such as shallow penetration depth, poor detection accuracy, and strong interference signals

Active Publication Date: 2021-07-16
中国计量大学上虞高等研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current probe materials used for the detection of lead ions have both excitation and emission wavelengths in the visible li

Method used

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  • Fluorescent probe material as well as preparation method and application thereof
  • Fluorescent probe material as well as preparation method and application thereof
  • Fluorescent probe material as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0036] The present invention provides a preparation method for the fluorescent probe material described in the above technical solution, comprising the following steps:

[0037] The first sodium salt, potassium salt, first bismuth salt, erbium salt, first ytterbium salt, first fluorine source, first oleic acid, first oleylamine and first solvent are mixed for the first growth to obtain nuclear nano crystal;

[0038] Mixing a second sodium salt, a second bismuth salt, a second ytterbium salt, a second fluorine source, a second oleic acid, a second oleylamine and a second solvent with the core nanocrystal to perform a second growth to obtain a fluorescent probe needle material;

[0039] The molar ratio of the first sodium salt, potassium salt, first bismuth salt, erbium salt, first ytterbium salt and first fluorine source is 0.6:0.4:(0.5~0.7):(0.3~0.5):0.1:4 ;

[0040] The molar ratio of the second sodium salt, the second bismuth salt, the second ytterbium salt and the second...

Embodiment 1

[0065] Contains oleic acid ligand Na 0.6 K 0.4 Bi 0.5 Er 0.4 Yb 0.1 f 4 @NaBi 0.8 Yb 0.2 f 4 The preparation method of core-shell nanocrystals is as follows:

[0066] (1) Add 0.6mmol sodium nitrate, 0.2mmol potassium carbonate, 0.5mmol bismuth nitrate, 0.4mmol erbium nitrate and 0.1mmol ytterbium nitrate to 5mL ethylene glycol, stir for 10min, then add 4mmol ammonium fluoride, 10mL oleic acid and 2mL of oleylamine was stirred at room temperature (30°C) for 40min, and the resulting product was centrifuged and washed 3 times with a mixture of ethanol and cyclohexane (volume ratio: 3:1), and the obtained Na 0.6 K 0.4 Bi 0.5 Er 0.4 Yb 0.1 f 4 Nuclear nanocrystals are dispersed in 5mL cyclohexane for later use;

[0067] (2) Add 1mmol sodium nitrate, 0.8mmol bismuth nitrate and 0.2mmol ytterbium nitrate to 5mL ethylene glycol, stir for 10min, then add 10mL oleic acid and 2mL oleylamine, stir at room temperature (30°C) for 40min, then Add the nuclear nanocrystal disper...

Embodiment 2

[0069] The difference from Example 1 is only that 0.1 mmol of ytterbium nitrate is added in step (2), that is, the doping concentration of ytterbium ions in the shell is 10 mol%.

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Abstract

The invention provides a fluorescent probe material as well as a preparation method and application thereof, and belongs to the technical field of inorganic luminescent materials. The fluorescent probe material provided by the invention can emit 980nm up-conversion light under the excitation condition of a 1550nm laser, the excitation light and the emission light are both located in a near-infrared region, no background fluorescence exists in the detection process, and the accuracy is high; moreover, an oleic acid ligand on the surface can enable core-shell nanocrystals to have good dispersity in gasoline, the influence of lead ions on the surface of the core-shell nanocrystals is promoted, the lead ions can effectively capture electrons on the Er<3+> ion excited state energy level, and then the energy transfer efficiency from Er<3+> to Yb<3+> is reduced; therefore, the up-conversion luminescence intensity of Yb <3+> ions at 980nm is gradually weakened along with the increase of the lead ion concentration, and the probe material can be applied to quantitative detection of the lead content in gasoline.

Description

technical field [0001] The invention relates to the technical field of inorganic luminescent materials, in particular to a fluorescent probe material and its preparation method and application. Background technique [0002] Lead ion (Pb 2+ ) is obtained by the loss of the two outermost electrons of the lead atom, usually blue, and in aqueous solution as a hydrated ion [Cu(H 2 O) 4 ] 2+ form exists. Different salts containing lead ions are widely used in the fields of human daily life, biomedicine and industry, mainly because lead ions have many special functions. For example, lead ions have a bactericidal effect, and lead ions can be properly added to the swimming pool for anti-virus, so the swimming pool water is usually blue; lead sulfate is considered to be a pesticide with high safety; lead ions in yam and connective tissue It is of great help to human development and has obvious curative effect on vascular system diseases. Lead is a metal element needed by the hum...

Claims

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Application Information

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IPC IPC(8): C09K11/85G01N21/64
CPCC09K11/7773G01N21/643
Inventor 雷磊华有杰叶仁广邓德刚徐时清
Owner 中国计量大学上虞高等研究院有限公司
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