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Green fluorescent carbon quantum dot, and preparation method and application thereof

A green fluorescence, carbon quantum dot technology, applied in fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve problems such as poor stability, achieve low cost, improve dispersion and uniformity, and reduce by-products.

Active Publication Date: 2018-08-10
SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem of poor stability of the existing carbon quantum dots due to the dependence on a mixture of various small molecular organic compounds as precursors, thereby providing a simple operation, high fluorescence efficiency and a method for preparing green fluorescent carbon quantum dots with good stability; further, the present invention also provides green fluorescent carbon quantum dots prepared by the above method and applications thereof; meanwhile, the present invention also provides green fluorescent carbon quantum dots containing the green fluorescent carbon quantum dots Reagent test kit

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  • Green fluorescent carbon quantum dot, and preparation method and application thereof
  • Green fluorescent carbon quantum dot, and preparation method and application thereof
  • Green fluorescent carbon quantum dot, and preparation method and application thereof

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Embodiment 1

[0039] This embodiment provides a method for preparing green fluorescent carbon quantum dots, specifically:

[0040] Weigh 0.2g of 2,3-diaminopyridine and dissolve it in 20mL of N,N-dimethylformamide, then stir evenly, transfer the mixed solution into a 50mL stainless steel reaction kettle lined with polytetrafluoroethylene, and tighten the lid , and reacted at 180°C for 10 hours. The reactor was naturally cooled to room temperature to obtain an aqueous solution of green fluorescent carbon quantum dots. The solution was then centrifuged at 10,000 rpm for 15 minutes to remove large solid precipitates. The liquid was transferred into a 1000Da molecular weight dialysis bag for dialysis for 72 hours, and the liquid in the dialysis bag was collected. The collected inner liquid is freeze-dried repeatedly to obtain solid powder, which is the green fluorescent carbon quantum dot. With rhodamine 6G as reference material, based on the formula QYS=QYST (I S / I ST )(A ST / A S )(η ...

Embodiment 2

[0043] This embodiment provides a method for preparing green fluorescent carbon quantum dots, specifically:

[0044] Weigh 0.2g of 2,3-diaminopyridine and dissolve it in 20mL of acetone, then stir evenly, transfer the mixed solution into a 50mL stainless steel reaction kettle with a polytetrafluoroethylene liner, tighten the lid of the kettle, and react at 190°C for 7 Hour. The reactor was naturally cooled to room temperature to obtain an aqueous solution of green fluorescent carbon quantum dots. The solution was then centrifuged at 10,000 rpm for 15 minutes to remove large solid precipitates. The liquid was transferred into a dialysis bag with a molecular weight of 800Da for dialysis for 96 hours, and the liquid in the dialysis bag was collected. The collected inner liquid is freeze-dried repeatedly to obtain solid powder, which is the green fluorescent carbon quantum dot. Taking rhodamine 6G as a reference substance, the fluorescence quantum yield of the carbon quantum do...

Embodiment 3

[0046] This embodiment provides a method for preparing green fluorescent carbon quantum dots, specifically:

[0047] Weigh 0.2g of 2,3-diaminopyridine and dissolve it in 20mL of ethyl acetate, then stir evenly, transfer the mixed solution into a 50mL stainless steel reaction kettle lined with polytetrafluoroethylene, tighten the lid of the kettle, at 170°C React for 11 hours. The reactor was naturally cooled to room temperature to obtain an aqueous solution of green fluorescent carbon quantum dots. The solution was then centrifuged at 10,000 rpm for 15 minutes to remove large solid precipitates. The liquid was transferred into a 1200Da molecular weight dialysis bag for dialysis for 72 hours, and the liquid in the dialysis bag was collected. The collected inner liquid is freeze-dried repeatedly to obtain solid powder, which is the green fluorescent carbon quantum dot. Taking rhodamine 6G as a reference substance, the fluorescence quantum yield of the carbon quantum dot is 20...

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Abstract

The invention belongs to the technical field of carbon nanomaterials, and discloses a green fluorescent carbon quantum dot, and a preparation method and an application thereof. The method comprises the following steps: (1) dispersing 2,3-diaminopyridine in an organic solvent to obtain a precursor solution; (2) reacting the precursor solution in a reaction vessel to obtain a solution containing thegreen fluorescent carbon quantum dot; and (3) separating and purifying the solution containing the green fluorescent carbon quantum dot to obtain the green fluorescent carbon quantum dot. The 2,3-diaminopyridine used as a reaction raw material undergoes a solvothermal one-step reaction to prepare the carbon quantum dot, so the preparation method has the advantages of fast reaction speed, few byproducts and intermediate products, easy obtaining and extremely small use amount of the raw material, low cost and good repeatability, and allows the quantum yield to reach up to 21%.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a green fluorescent carbon quantum dot, a preparation method and an application thereof. Background technique [0002] Nitrite is a chemical substance that widely exists in the natural environment. Because it can prevent bacterial growth, it is often used in the food industry as a food additive. Foods such as grains and vegetables contain a certain amount of nitrite. The World Health Organization and the Food Science Committee of the European Commission set the maximum daily intake of nitrite as 0.07mg / Kg. Excessive nitrite entering the human blood will oxidize normal hemoglobin containing Fe(II) into Fe(III) ) of methemoglobin, which in turn causes normal hemoglobin to lose its oxygen-carrying capacity, severely depriving the brain of oxygen and even death. In addition, nitrite can also react with secondary amines, tertiary amines and amides to generate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00G01N21/64
CPCB82Y20/00B82Y30/00C09K11/65G01N21/643G01N21/6486G01N2021/6432
Inventor 昝明辉董文飞李力葛明锋郄兴旺
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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