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Fluorescence-enhanced graphene quantum dots-down-conversion rare earth fluoride composites

A technology of graphene quantum dots and composite materials, applied in the field of fluorescence-enhanced graphene quantum dots-down-conversion rare earth fluoride composite materials, can solve the problems of limited application, easy agglomeration, large particle size of rare earth fluorides, etc. Cytotoxicity, strong fluorescence emission, high crystallinity effect

Active Publication Date: 2020-08-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the rare earth fluorides obtained by the traditional hydrothermal method is relatively large, and they are easy to agglomerate, which greatly limits their application in fields such as biological analysis

Method used

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  • Fluorescence-enhanced graphene quantum dots-down-conversion rare earth fluoride composites
  • Fluorescence-enhanced graphene quantum dots-down-conversion rare earth fluoride composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare composite material:

[0027] 5mmol TbCl 3 ·6H 2 O was dissolved in 15mL deionized water, and slowly added dropwise 5mg·mL -1 Histidine functionalized graphene quantum dot solution (Li R, Chen J, Zhou X, et al. Fabrication of zinc–histidine-functionalized graphene quantum dot framework amphiphilic nanoparticles and application in the synthesis of polystyrene microspheres for adsorption of Cu 2+ by Pickering emulsion polymerization[J].RSC Advances, 2016,6(104):102534-102541.) 100mL, stirred for 30min. Add 60mL 1.0mol·L dropwise -1 Add NaF aqueous solution to the above mixed solution, stir vigorously for 1 hour, then transfer to a pressure reactor, react at 180°C for 4 hours, cool to room temperature, collect the supernatant, centrifuge at 10,000 rpm for 20 minutes, wash the precipitate with water for 3 times, and freeze-dry to obtain a solid composite material The samples were examined by transmission electron microscopy ( figure 1 A) It can be seen that the ...

Embodiment 2

[0033] Prepare composite material:

[0034] 1mmol SmCl 3 ·6H 2 O was dissolved in 3mL deionized water, and 5mg·mL was slowly added dropwise -1 Histidine functionalized graphene quantum dot solution 30mL, stirred for 30min. Add 10mL 1.0mol·L dropwise -1 The NaF aqueous solution was added to the above mixed solution, stirred vigorously for 1 hour, then transferred to a pressure reactor, reacted at 200°C for 3 hours, cooled to room temperature, collected the supernatant, centrifuged at 9000 rpm for 20 minutes, washed the precipitate with water for 3 times, and freeze-dried to obtain a solid sample. Sample transmission electron microscope as figure 2 a.

[0035] Composite material solid sample and only histidine functionalized graphene quantum dots are formulated into an aqueous solution with the same concentration of 0.5 mg / mL, and the fluorescence intensity at the emission wavelength ( figure 2 B).

[0036] Application of composite materials:

[0037] The complex was p...

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Abstract

The invention discloses a fluorescence enhanced graphene quantum dot-down-conversion rare earth fluoride composite and belongs to the field of chemical industry. The rare earth fluoride composite obtained by combining graphene quantum dots with rare earth fluoride through a simple hydrothermal synthesis method is small in grain size, high in crystallinity and easy to be dispersed in water. Compared with existing methods, a preparation method of the composite is simple, efficient and environment-friendly.

Description

technical field [0001] The invention relates to a fluorescence-enhanced graphene quantum dot-down-conversion rare earth fluoride composite material, which belongs to the field of chemical industry. Background technique [0002] Graphene quantum dots are single-layer or multi-layer (3-10 layers) graphene fragments with a lateral size of less than 10nm. Their quantum confinement and edge effects endow them with optical activity, electrical conductivity and chemical inertness. Fields such as cell imaging and optoelectronic devices have shown great application prospects. However, the fluorescence quantum yield of graphene quantum dots prepared by the current technology is not high, and its application as an optical probe is very limited. [0003] Rare earth fluorides are important luminescent materials due to their wide bandgap, low phonon energy, high thermal and environmental stability. The luminescent performance of rare earth fluoride depends on its composition, and differ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/85C09K11/06G01N21/64
CPCC09K11/06C09K11/7748C09K11/7763C09K2211/182G01N21/6428G01N2021/6432
Inventor 李在均刘玲李瑞怡
Owner JIANGNAN UNIV