Nitrogen-doped fluorescent carbon quantum dot and preparation method and application thereof

A technology of carbon quantum dots and nitrogen doping, applied in the field of material science, can solve the problems of unfavorable large-scale preparation, time-consuming, complicated process, etc., and achieve the effects of excellent fluorescence properties, high yield and good stability.

Inactive Publication Date: 2015-08-19
FUZHOU UNIV
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Problems solved by technology

Obviously, the above-mentioned methods for synthesizing doped carbon quantum dots all involve problems such as time-consum...

Method used

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  • Nitrogen-doped fluorescent carbon quantum dot and preparation method and application thereof
  • Nitrogen-doped fluorescent carbon quantum dot and preparation method and application thereof
  • Nitrogen-doped fluorescent carbon quantum dot and preparation method and application thereof

Examples

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Embodiment 1

[0020] The first step is to collect fish scales in the market, wash them, chop them and put them in an oven for drying; the temperature of the oven is 80°C, the heating rate is 5°C / min, and the treatment time is 1-5h;

[0021] The second step, weigh 2g of the fish scales treated in the first step, add 30ml of water to completely immerse the fish scales in the water, transfer them to the polytetrafluoroethylene liner of the hydrothermal kettle, seal them and heat them in an oven at 200°C for 24 hours , cooled to room temperature with the furnace to obtain a suspension;

[0022] The third step is to use a filter membrane with a pore size of 0.22um to filter the above suspension to remove large reaction residues to obtain a clear solution, which is an aqueous solution of water-soluble fluorescent carbon quantum dots. The solution has a molecular weight cut-off of 3.5kD The ultrafiltration membrane was dialyzed, and the carbon quantum dot solid was obtained after vacuum freeze-d...

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Abstract

The invention discloses a nitrogen-doped fluorescent carbon quantum dot and a preparation method and application thereof, and belongs to the technical field of material science. Fish wastes (such as fish scales, bones and skins) are cleaned, then hydrothermal reaction is directly performed to obtain nitrogen-doped fluorescent carbon quantum dot aqueous dispersion, and finally filtration, dialysis and freeze-drying are performed to obtain nitrogen-doped fluorescent carbon quantum dot solid. The size of the nitrogen-doped fluorescent carbon quantum dot prepared by using the preparation method disclosed by the invention is smaller than or equal to 10nm, the nitrogen content is smaller than or equal to 20 percent, the surface of the quantum dot has nitrogen-containing and oxygen-containing functional groups, and the quantum efficiency is 17-30 percent. The nitrogen-doped fluorescent carbon quantum dot and the preparation method and application thereof have the advantages that the preparation method is environmental-friendly, the operation is simple, the requirements on equipment are low, the preparation method is suitable for large-scale production, and the prepared nitrogen-doped fluorescent carbon quantum dot has excellent fluorescent performance and can be widely applied to fields such as photoelectric materials, biological imaging and fluorescent probes.

Description

technical field [0001] The invention belongs to the technical field of material science, and relates to a nitrogen-doped fluorescent carbon quantum dot and its preparation method and application, in particular to a nitrogen-doped fluorescent carbon quantum dot sourced from fish waste and applied to hypochlorite ions detection. Background technique [0002] Quantum dots are quasi-zero-dimensional nanomaterials composed of a small number of atoms, with a size between 1-100nm. Internal electron movement is strongly restricted in three dimensions, so it is also called artificial atom. Quantum dots have many unique properties due to their special size structure, such as quantum confinement effect, surface effect and quantum tunneling effect, etc., which can be used as a new type of fluorescent material in molecular biology, cell biology, biochemistry, biological It has a wide range of applications in medicine, proteomics and other fields. At present, traditional semiconductor ...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y30/00
Inventor 詹红兵吴国钦冯苗
Owner FUZHOU UNIV
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