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Luminescent carbon quantum dot and preparation method and application thereof

A technology of carbon quantum dots and small molecules, which is applied in the field of luminescent carbon quantum dots and its preparation, can solve problems such as complex operation process, high energy consumption, and cumbersome operation steps, and achieve easy control of reaction conditions, easy industrial production, and preparation process simple effect

Inactive Publication Date: 2019-05-28
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
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Problems solved by technology

For example, CN105647529A introduces a method for preparing solid-state luminescent carbon quantum dots. By dispersing carbon quantum dots in a starch matrix to avoid aggregation-induced fluorescence quenching, the preparation process requires an additional ultrasonic composite process. In addition, the synthesized carbon quantum dots The mixed solution with starch needs to go through a vacuum freeze-drying process to obtain solid powder. The operation steps of this method are cumbersome, and industrial production is difficult; CN102504815A discloses a carbon quantum whose emission color is adjustable with the excitation wavelength based on thermally decomposed emulsion colloidal particles. Dot preparation method, this method first needs to prepare an emulsion precursor with a suitable particle size as a raw material to synthesize carbon quantum dots, and needs to go through a high-temperature calcination process, the operation process is complicated, the energy consumption is high, and it is not suitable for industrial production

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  • Luminescent carbon quantum dot and preparation method and application thereof
  • Luminescent carbon quantum dot and preparation method and application thereof
  • Luminescent carbon quantum dot and preparation method and application thereof

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preparation example Construction

[0029] The invention provides a preparation method of luminescent carbon quantum dots, comprising the following steps:

[0030] (1) Mix organic small molecule, organosilane and reaction solvent to carry out solvothermal reaction, obtain crude product;

[0031] (2) Filter and dialyze the crude product in sequence to obtain liquid luminescent carbon quantum dots.

[0032] The invention mixes small organic molecules, organic silanes and reaction solvents to carry out solvothermal reaction to obtain crude products. In the present invention, the small organic molecules are preferably one or more of citric acid, ascorbic acid, glucose, glucosamine, glycine, cysteine, glutamic acid and phenylalanine; There is no special requirement on the source of the small organic molecules, and conventional small organic molecules commercially available in this field can be used.

[0033] In the present invention, the organosilane is preferably 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethox...

Embodiment 1

[0045] Weigh 0.1g of anhydrous citric acid and 2mL of 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane, add 10mL of ethanol, and ultrasonically mix for 10min. The obtained reaction mixture was added to a 50 mL polytetrafluoroethylene autoclave, and the autoclave was subjected to solvent heat treatment at 190°C for 10 h in a homogeneous reactor, and then heated to 190°C at room temperature with a heating rate of 5°C / min. After the reaction was completed, the reaction kettle was naturally cooled to room temperature, the crude product was filtered through a filter membrane with a pore size of 0.22 μm, and then the filtrate was dialyzed for 24 hours with a dialysis membrane with a molecular weight cut-off of 500 Da to obtain liquid luminescent carbon quantum dots.

Embodiment 2

[0047] Weigh 0.5g of anhydrous glucosamine and 4mL of 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane, add 10mL of acetone, and ultrasonically mix for 10min. The obtained reaction mixture was added to a 50 mL 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 to 210°C at room temperature at a heating rate of 5°C / min. After the reaction was completed, the reaction kettle was naturally cooled to room temperature, and 40 mL of deionized water was added, centrifuged at 10,000 rpm for 10 min, then filtered through a filter membrane with a pore size of 0.22 μm, and the filtrate was dialyzed with a dialysis membrane with a molecular weight cut-off of 500 Da for 24 h. Finally, the dialysate was dried by rotary evaporation to obtain solid luminescent carbon quantum dots.

[0048] The optical photo of the obtained luminescent carbon quantum dots under the ex...

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Abstract

The invention provides a luminescent carbon quantum dot and a preparation method and application thereof, and belongs to the technical field of nano materials. The luminescent carbon quantum dot adopts small organic molecules as raw materials, the raw materials are cheap and easy to obtain, and the production cost can be effectively reduced; a solvothermal reaction is used for preparing the luminescent carbon quantum dot, the reaction raw materials do not need pretreatment, the preparation process is simple, the reaction conditions are easy to control, and the industrialized production is easyto realize; and the preparation method can prepare a liquid luminescent carbon quantum dot and a solid-state luminescent carbon quantum dot, wherein the liquid luminescent carbon quantum dot has concentration-dependent fluorescence emission characteristics and is adjustable in fluorescent color, and the solid-state carbon quantum dot can realize solid-state illumination of the carbon quantum dot.The luminescent carbon quantum dot can be used in the fields of fluorescence detection of heavy metal ions and organic small molecules, fluorescence imaging of non-therapeutic cells and light-emitting diodes.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a luminescent carbon quantum dot and its preparation method and application. 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, it is used in photocatalytic technology, analysis and detection, in vivo imaging and cell labeling, light-emitting diodes and drug delivery and other fields. From both fundamental and applied viewpoints, the fluorescence property is the most prominent feature of carbon quantum dots. [0003] Studies on multicolor luminescence and carbon quantum dots with solid-state luminescence properties have been reported. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64H01L51/50
Inventor 李伟刘守新刘禹杉吴雪云马春慧罗沙
Owner NORTHEAST FORESTRY UNIVERSITY
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