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Fluorescent quantum dot with MoS2 and organic polymer shell structure and preparation method of fluorescent quantum dot

A technology of fluorescent quantum dots and shell structure, applied in chemical instruments and methods, luminescent materials, nano-optics, etc., can solve the problems of difficult purification, high synthesis cost, hindering the formation and imaging of MoS2 quantum dots, etc.

Pending Publication Date: 2022-05-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of MoS with high boiling point solvents such as oleic acid and oleylamine 2 Quantum dots still have the problems of difficult purification and high synthesis cost
These problems are hindering the MoS 2 Key technical issues in the application of quantum dots in generative imaging, etc.

Method used

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  • Fluorescent quantum dot with MoS2 and organic polymer shell structure and preparation method of fluorescent quantum dot
  • Fluorescent quantum dot with MoS2 and organic polymer shell structure and preparation method of fluorescent quantum dot
  • Fluorescent quantum dot with MoS2 and organic polymer shell structure and preparation method of fluorescent quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] MoS prepared with a reaction time of 1 hour 2 @Organic polymer shell-structured quantum dots.

[0036] In this example, the reaction time was 1 hour. The prepared MoS 2 @Organic polymer quantum dots: 5.0mmolNa 2 MoO 4 2H 2 Dissolve O in 2-5mL deionized water, add 2.0mL acetylacetone while stirring at room temperature, add KOH aqueous solution to adjust the pH value of the mixed solution to 8-9, the upper layer of the aqueous solution appears colorless oily tetraacetylacetonate molybdenum oxide, separate the liquid A colorless oily liquid was taken out, and the yield was about 80%. Dissolve 0.5mL tetraacetylacetonate molybdenum oxide in 40mL tetrahydrofuran, add 30.0 microliters of hydrazine hydrate with a concentration of 85% by mass, and then add 1mmol of thioacetamide in tetrahydrofuran dropwise in a nitrogen atmosphere. ℃ stirring reaction for 30 minutes, reflux at 70 ℃ for 1 hour to obtain MoS 2 Tetrahydrofuran solution of fluorescent quantum dots, named MoS ...

Embodiment 2

[0044] MoS 2 @Organic polymer shell structure quantum dots and MoS 2 Stability tests of quantum dots in tetrahydrofuran and aqueous phase, respectively.

[0045] Take 500 μL of the MoS synthesized in Example 1 2 @organic polymer shell-THF solution was diluted 6 times with THF and deionized water, respectively. The control sample is to take 500 μL of MoS 2 The -THF solution was diluted 6 times with tetrahydrofuran and deionized water, respectively. The fluorescence spectra of the four samples were tested at 2 minutes, 5 minutes, 10 minutes, 15 minutes, 30 minutes, 60 minutes, and 120 minutes to characterize their fluorescence stability.

[0046] image 3 (b) is the MoS prepared in Example 1 2 Fluorescence excitation and emission spectra of quantum dot aqueous solution after standing for 2 minutes. with MoS 2 -THF compared to MoS 2 The fluorescence signal of fluorescent quantum dots is rapidly quenched in aqueous solution, and its excitation spectrum is obviously broade...

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Abstract

The MoS2 quantum dots have good compatibility with biological molecules, and fluorescence signals of the MoS2 quantum dots are easily quenched by water molecules, so that the application of the MoS2 quantum dots in the aspects of biological imaging and the like is limited. The invention discloses a preparation method of MoS2 and organic polymer shell structure fluorescent quantum dots. The MoS2 quantum dot with the core-at-shell structure has very stable fluorescence performance in an aqueous solution, and emits bright blue-green fluorescence under the excitation of ultraviolet light. The method comprises the following steps: by taking molybdate such as Na2MoO4 as a molybdenum source, adding acetylacetone into a water phase, and adjusting the pH value of the solution, thereby separating the tetraacetylacetone molybdenum oxide oily liquid from the water phase. The preparation method comprises the following steps: dissolving a certain amount of molybdenum oxide tetraacetylacetonate into tetrahydrofuran, and synthesizing the MoS2 quantum dot fluorescent material by taking thioacetamide as a sulfur source and hydrazine hydrate as a reducing agent. The MoS2 quantum dot with a large number of acetylacetone molecules coordinated on the particle surface can be synthesized into the MoS2 at organic polymer shell structure fluorescent quantum dot under the solvothermal condition of 180 DEG C or above. The preparation method is simple in synthesis condition and relatively low in preparation cost.

Description

technical field [0001] The present invention specifically relates to a stable MoS in aqueous solution 2 @Preparation method of fluorescent quantum dots with organic polymer shell structure. Background technique [0002] MoS 2 It is a typical transition metal sulfide with layered structure. When its size is reduced to a monolayer, its bandgap is converted from an indirect bandgap to a direct bandgap. Zero-dimensional MoS 2 The photoluminescent properties of quantum dots will be greatly improved. Molybdenum is one of the trace elements necessary for human physiological activities, MoS 2 Quantum dots have good compatibility with biomolecules, and have broad application prospects in bioimaging, biomolecular fluorescence detection and sensors. [0003] Currently synthesized MoS 2 The chemical synthesis method of quantum dots mainly uses high boiling point solvents such as oleic acid and oleylamine to control MoS 2 The particle size and morphology of quantum dots are used ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/68B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/02C09K11/681B82Y20/00B82Y30/00B82Y40/00
Inventor 安保礼贾欣李菁徐甲强
Owner SHANGHAI UNIV
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