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Up-conversion luminescence nanoparticle, and preparation method and application thereof

A technology of nanoparticles and reactants, which is applied in the field of chemical analysis and detection, can solve the problems of poor dispersion ability and irreversible luminescence, and achieve the effects of low detection limit, enhanced up-conversion luminous intensity, and good selectivity

Active Publication Date: 2020-06-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of poor dispersion ability and irreversible luminescence in the existing up-conversion luminescent nanoparticle aqueous solution, and provide an up-conversion The preparation method of luminescent nanoparticles is to synthesize up-conversion luminescent nanoparticles by co-precipitation method, and functionalize the surface with polyacrylic acid. The nanoparticles have good dispersion ability in aqueous solution and can be reused

Method used

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  • Up-conversion luminescence nanoparticle, and preparation method and application thereof
  • Up-conversion luminescence nanoparticle, and preparation method and application thereof
  • Up-conversion luminescence nanoparticle, and preparation method and application thereof

Examples

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Embodiment 1

[0053] A preparation method for upconversion luminescent nanoparticles, consisting of NaYbF 4 :Nd@NaGdF 4 :Yb,Tm@)NaGdF 4 , named PAA-UCNPs, including the following steps:

[0054] S1. Add ytterbium acetate, neodymium acetate, oleic acid and 1-octadecene into a two-necked flask; heat to 120°C in a heating mantle, react for 30 minutes, and remove water in the reaction system; raise the temperature to 170°C, React for 40min; obtain the reaction liquid containing the precursor of the rare earth-oleic acid complex, cool to room temperature; add NH 4 The methanol mixture of F and NaOH was added to the reaction system; the mixture was heated to 45°C and reacted for 30 minutes; the temperature was raised to 110°C and reacted for 20 minutes to remove methanol; vacuum was pumped for 10 minutes; h; after the reaction, cool to 25°C, transfer the reaction solution to a centrifuge tube, wash three times with absolute ethanol, and the obtained nuclear nanoparticles are dispersed in cyclo...

Embodiment 2

[0060] A method for preparing up-conversion luminescent nanoparticles, named PAA-UCNPs, comprising the following steps:

[0061] The preparation method of this example is the same as that of Example 1, except that the molar ratio of ytterbium acetate to neodymium acetate in step S1 is replaced with 40:60.

Embodiment 3

[0063] A method for preparing up-conversion luminescent nanoparticles, named PAA-UCNPs, comprising the following steps:

[0064] The preparation method of this example is the same as that of Example 1, except that the molar ratio of ytterbium acetate to neodymium acetate in step S1 is replaced with 60:40.

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Abstract

The invention discloses an up-conversion luminescent nanoparticle and a preparation method and application thereof. The preparation method comprises the steps that core-shell-shell structure nanoparticles are prepared from ytterbium acetate, neodymium acetate, thulium acetate, gadolinium acetate, oleic acid and 1-octadecene through a coprecipitation method, and oleic acid (OA) coated up-conversionluminescent nanoparticles (UCNPs) are prepared. The inert shell structure on the outermost layer can greatly reduce luminescence quenching caused by surface defects of outer-layer ligands and nanocrystals and enhance the up-conversion luminescence intensity. Polyacrylic acid (PAA) is adopted to functionalize the surfaces of the nanoparticles, so that the upconversion nanoparticles have good dispersing capacity in an aqueous solution, and directional recognition of copper ions in an aqueous phase system is realized. The up-conversion luminescence intensity obtained by adopting 980nm or 808nm excitation has a good linear relationship with the copper ion concentration. The nanoparticle has the characteristics of good selectivity, low luminescence detection limit and wide linear range. Ethylene diamine tetraacetic acid (EDTA) is added, so that the luminescence of the up-conversion nanoparticles is recovered, and the up-conversion nanoparticles can be recycled.

Description

technical field [0001] The invention relates to the technical field of chemical analysis and detection, and more specifically, to an up-conversion luminescent nanoparticle and a preparation method and application thereof. Background technique [0002] Copper ions (Cu 2+ ) is an essential element of organisms and participates in various physiological processes of organisms. The average concentration of copper ions in organisms is 100-150mg / dL, and abnormal copper ion content can cause various diseases. Excess Cu 2+ Oxidative stress is triggered, leading to related neurodegenerative diseases including Menkes syndrome, Alzheimer's disease, Parkinson's disease, etc. Therefore, it is necessary to develop a luminescent probe with high sensitivity to detect Cu 2+ . [0003] As a commonly used luminescent material, hydrophobic organic dye molecules are usually loaded in various nanocarriers to improve the fluorescence stability and targeting in biological environments. Large r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/85B82Y30/00B82Y40/00G01N21/64
CPCC09K11/7773C09K11/02B82Y30/00B82Y40/00G01N21/643G01N2021/6439
Inventor 温红丽苏少珊陈相郝志峰余林李翠婷
Owner GUANGDONG UNIV OF TECH
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