PH-sensitive dual-emission carbon quantum dot and organic composite film thereof, and preparation methods and applications thereof

A technology of carbon quantum dots and composite thin films, which is applied in the field of nanomaterials, can solve problems such as not being easy to capture with the naked eye, limiting the application range of carbon quantum dots, and few reports on double-peak emission carbon quantum dots, etc., to achieve reduced production costs and simple operation Effect

Inactive Publication Date: 2019-05-21
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

However, carbon quantum dot fluorescent probes still face some challenges
At present, carbon quantum dot fluorescent probes are mostly used to detect metal ions or small organic molecules, and there are few reports on their application in the field of pH sensing, which greatly limits their application in the field of analysis and detection.
[0003] Although great progress has been made in the preparation of carbon quantum dots, most of the synthesized carbon quantum dots have single-peak emission, and the method of preparing double-peak emission carbon quantum dots is rarely reported.
In addition, the pH environment has a great influence on the fluorescence emission of carbon quantum dots. The investigation of the pH sensitivity of carbon quantum dots is conducive to exploring its fluorescence mechanism and developing it

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  • PH-sensitive dual-emission carbon quantum dot and organic composite film thereof, and preparation methods and applications thereof

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preparation example Construction

[0024] The invention provides a kind of preparation method with pH sensitive double-emission carbon quantum dots, comprising the following steps:

[0025] Mixing small organic molecules, an organic nitrogen source and a reaction solvent to obtain a reaction mixture;

[0026] The reaction mixture was subjected to a solvothermal reaction to obtain a crude product;

[0027] The crude product is sequentially filtered, rotary evaporated, dissolved in water and dialyzed to obtain dual-emission carbon quantum dots with pH sensitivity under the excitation of ultraviolet light.

[0028] The invention mixes small organic molecules, organic nitrogen source and reaction solvent to obtain reaction mixture. In the present invention, the ratio of the small organic molecule, the organic nitrogen source and the reaction solvent is preferably 0.05-5g:0.05-5g:5-35mL, more preferably 0.1-2g:0.2-2g:10-25mL, most preferably Preferably it is 0.5:0.5g:10mL.

[0029] In the present invention, the s...

Embodiment 1

[0050] Weigh 0.5 g of anhydrous citric acid and 0.5 g of phenylenediamine, add 10 mL of acetone, and ultrasonically mix for 10 min. The obtained reaction mixture was added to a 30mL polytetrafluoroethylene autoclave, and the reactor was solvent-heated at 160°C for 6h in a homogeneous reactor, and the temperature was raised from room temperature to 160°C at a heating rate of 5°C / min. After the reaction was completed, the reaction kettle was naturally cooled to room temperature, and the crude product was filtered through a filter membrane with a pore size of 0.22 μm, dried by rotary evaporation at 60°C, and then dissolved in water, and dialyzed with a dialysis membrane with a molecular weight cut-off of 500Da for 24 hours to obtain carbon quantum point. After mixing 1mL of 5mg / mL carbon quantum dot aqueous solution with 3mL of 5% polyvinyl alcohol, the carbon quantum dot organic composite film was synthesized at 60°C.

[0051] The carbon quantum dots prepared in this embodiment...

Embodiment 2

[0054] Weigh 0.1g of anhydrous glucosamine and 0.2g of polyethyleneimine, add 10mL of ethanol, and ultrasonically mix for 10min. The obtained reaction mixture was added into a 30mL polytetrafluoroethylene autoclave, and the autoclave was subjected to solvent heat treatment at 210°C for 2 hours in a homogeneous reactor, and the temperature was raised from room temperature to 210°C at a heating rate of 5°C / min. After the reaction was completed, the reaction kettle was naturally cooled to room temperature, and the crude product was filtered through a filter membrane with a pore size of 0.22 μm, dried by rotary evaporation at 60°C, and then dissolved in water, and dialyzed with a dialysis membrane with a molecular weight cut-off of 500Da for 24 hours to obtain carbon quantum point.

[0055] After testing, the carbon quantum dots emit blue fluorescence under ultraviolet light and have low cytotoxicity to Hepg2 cells. They have been successfully used in Hepg2 cell imaging and emit g...

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Abstract

The invention provides a preparation method of a pH-sensitive dual-emission carbon quantum dot, and belongs to the technical field of nanomaterials. The pH-sensitive dual-emission carbon quantum dot is prepared from a common organic micro-molecule by using a solvothermal reaction through changing a traditional production process, and has emission peaks at 445 nm and 555 nm respectively, the fluorescence intensity and the fluorescence peak position change with the pH environment, and when the pH value increases, the emission peak at 555 nm weakens, the emission peak at 445 nm strengthens, the fluorescence becomes blue from blue green, and the pH-sensitive dual-emission carbon quantum dot is easily applied to the fields of pH sensors and cell fluorescence imaging, and an organic composite film produced after compounding the pH-sensitive dual-emission carbon quantum dot with an organic polymeric matrix can be applied to fluorescence sensing of acidic and alkaline solvents or gases I orderto carry out food detection.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a pH-sensitive double-emission carbon quantum dot and an organic composite film, a preparation method and an application thereof. Background technique [0002] Carbon quantum dots are a new type of carbon nanomaterials with a diameter of less than 10nm, quasi-spherical shape, and monodisperse. Due to their excellent water solubility, chemical inertness, low toxicity, easy functionalization and photobleaching resistance, carbon quantum dots have gradually become a A new star in the family of carbon nanomaterials. In recent years, thanks to the fluorescence quenching and recovery characteristics of carbon quantum dots, they have shown good application effects in the field of analysis and detection. However, carbon quantum dot fluorescent probes still face some challenges. At present, carbon quantum dot fluorescent probes are mostly used to detect metal ions or s...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02G01N21/64B82Y20/00B82Y30/00
Inventor 李伟刘守新刘禹杉马春慧吴雪云罗沙
Owner NORTHEAST FORESTRY UNIVERSITY
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