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Monodisperse near infrared silver telluride quantum dots and preparation method thereof

A quantum dot and near-infrared technology, applied in the field of material science, can solve the problems of poor stability of quantum dots, no near-infrared fluorescence emission, etc., and achieve the effects of mild and controllable reaction conditions, suitable for large-scale industrial production, and simple operation.

Active Publication Date: 2016-12-07
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

About Ag 2 Although the synthesis of Te has been reported, the preparation methods mainly include metal-organic synthesis and aqueous phase synthesis. The synthesized quantum dots have poor stability and no near-infrared fluorescence emission.

Method used

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  • Monodisperse near infrared silver telluride quantum dots and preparation method thereof
  • Monodisperse near infrared silver telluride quantum dots and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Take 0.1mmol of tellurium powder and 0.3mmol of sodium borohydride and add them to 3mL of water, cut off the air and react for 30 minutes to obtain a clear and transparent aqueous solution of sodium telluride hydride; take 0.4mmol of silver nitrate and dissolve it in 35mL of oleylamine, and dissolve the sodium telluride hydride Add the aqueous solution into the silver nitrate solution, stir for 5 minutes, then add 5 mmol of 1-dodecanethiol, continue stirring for 10 minutes, transfer the above solution to a 50mL reactor, and conduct a hydrothermal reaction at 180°C for 0.5 hours. After the reaction is completed, naturally cool to At room temperature, the upper organic phase was washed with a large amount of ethanol, and the surface ligand was exchanged with mercaptopropionic acid to obtain Ag evenly dispersed in water. 2 Te quantum dots.

[0041] from figure 1 It can be seen from the transmission electron microscope photos that the near-infrared silver telluri...

Embodiment 2

[0042] Example 2 Take 0.1mmol of tellurium powder and 0.3mmol of sodium borohydride and add them to 2mL of water, cut off the air and react for 20 minutes to obtain a clear and transparent sodium telluride hydride solution; take 0.4mmol of silver acetate and dissolve it in 30mL of toluene, and dissolve the sodium telluride hydride solution Add silver nitrate solution, stir for 5 minutes, then add 5mmol tri-n-octyl phosphine, continue stirring for 10 minutes, transfer the above solution to a 50mL reaction kettle, and conduct a hydrothermal reaction at 200°C for 2 hours. After the reaction is completed, naturally cool to room temperature. After the upper organic phase was washed with a large amount of ethanol, the surface ligand was exchanged with mercaptopropionic acid to obtain Ag evenly dispersed in water. 2 Te quantum dots.

Embodiment 3

[0043] Example 3 Take 0.1mmol of tellurium powder and 0.3mmol of sodium borohydride and add them to 1mL of water, and react with the air for 10 minutes to obtain a clear and transparent sodium tellurium hydride aqueous solution; take 0.4mmol of silver lactate and dissolve it in 30mL of oleic acid, and dissolve the sodium tellurium hydride Add the aqueous solution to the silver nitrate solution, stir for 5 minutes, then add 5 mmol of cetyltrimethylammonium bromide, continue stirring for 10 minutes, transfer the above solution to a 50mL reactor, and conduct a hydrothermal reaction at 120°C for 24 hours, and the reaction is complete After natural cooling to room temperature, the upper organic phase was washed with a large amount of ethanol, and the surface ligand was exchanged with mercaptopropionic acid to obtain Ag evenly dispersed in water. 2 Te quantum dots.

[0044] In summary, the present invention prepares near-infrared silver telluride quantum dots by reacting at the two-...

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Abstract

The present invention discloses monodisperse near infrared silver telluride quantum dots and a preparation method thereof. The preparation method comprises: uniformly mixing a tellurium sodium hydride aqueous solution and an organic solution of a silver source, adding a surface ligand, carrying out a hydrothermal reaction, and carrying out surface functionalization to obtain the near infrared silver telluride quantum dots having the monodispersity in the polar solvent. According to the present invention, the near infrared silver telluride quantum dots are prepared by using the solvothermal-assisted phase interface synthesis method, wherein the reaction conditions are mild and controllable, the operation is simple, the repeatability is good, the used reagents are cheap and easy to obtain, the obtained near infrared silver telluride quantum dots have characteristics of uniform particle size, near-infrared luminescence property and high quantum yield, and by adjusting the particle size, the wavelength can be adjusted within 1300-1350 nm. In addition, the method of the present invention can be used for preparation of other telluride nanometer materials, easily amplify the reaction, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation process of quantum dots, in particular to a monodisperse near-infrared silver telluride quantum dot and a preparation method thereof, belonging to the field of material science. Background technique [0002] The development of new, low-toxic near-infrared second-region fluorescent materials has become a research hotspot (J.Am.Chem.Soc.2010, 132, 1470), especially the development of nanomaterials that can effectively adjust the wavelength of near-infrared second-region fluorescence. important. Using nanomaterials with different wavelengths as fluorescent probes can be used for multicolor imaging labeling in vivo, and will play an important role in the field of biomedicine. At present, there are almost no related reports on multi-color near-infrared second-region fluorescence imaging, especially multi-color imaging at the living level. A large part of the reason is that the near-infrared second-region fluorescent m...

Claims

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Application Information

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IPC IPC(8): C09K11/88C01B19/04B82Y40/00B82Y20/00
Inventor 王强斌董博华李德鲁张叶俊
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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