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A method for preparing size-controllable nitrogen-doped carbon quantum dots

A technology of carbon quantum dots and nitrogen doping, applied in the field of nanomaterials, can solve the problems of using carbon and nitrogen sources alone and harsh preparation conditions, and achieve the effect of cheap raw materials, low preparation temperature and easy control

Active Publication Date: 2018-05-18
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for preparing size-controllable nitrogen-doped carbon quantum dots, the purpose of which is to overcome the problems of relatively harsh preparation conditions and separate use of carbon and nitrogen sources in the current preparation method of nitrogen-doped carbon quantum dots. , by controlling the amount of carbonizing agent added, the size of carbon quantum dots can be controlled without other means of separation, thereby providing a carbonization agent with triisopropanolamine as a carbon source and nitrogen source, and ethanol as a solvent. , a method for synthesizing size-controllable nitrogen-doped carbon quantum dots by solvothermal reaction

Method used

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  • A method for preparing size-controllable nitrogen-doped carbon quantum dots
  • A method for preparing size-controllable nitrogen-doped carbon quantum dots
  • A method for preparing size-controllable nitrogen-doped carbon quantum dots

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Effect test

Embodiment approach 1

[0023] Add 2.9 mL of triisopropanolamine into 60 mL of ethanol and stir. After stirring evenly, slowly add 0.5 mL of dilute sulfuric acid (6.5%) and stir to obtain a uniform solution. The obtained solution was slowly transferred into a 90 mL polytetrafluoroethylene-lined stainless steel autoclave, placed in a constant temperature drying oven, and reacted at 120 °C for 12 h to obtain a light yellow stock solution of carbon quantum dots. The formed carbon quantum dot stock solution was injected into a dialysis bag for dialysis. The molecular weight of the dialysis bag was 500 Da, and the dialysis time was 72 h. The water was changed every 12 h to obtain a nitrogen-doped carbon quantum dot dispersion. The obtained nitrogen-doped carbon quantum dot dispersion was dried at 60°C to obtain a concentrate, and the concentrate was freeze-dried at -80°C to obtain a nitrogen-doped carbon quantum dot solid.

Embodiment approach 2

[0025] Add 4.9 mL of triisopropanolamine into 60 mL of ethanol and stir. After stirring evenly, slowly add 1.5 mL of dilute nitric acid (5.0 %), and stir to obtain a uniform solution. The obtained solution was slowly transferred into a 90 mL polytetrafluoroethylene-lined stainless steel autoclave, placed in a constant temperature drying oven, and reacted at 120 °C for 12 h to obtain a yellow carbon quantum dot stock solution. The formed carbon quantum dot stock solution was injected into a dialysis bag for dialysis. The molecular weight of the dialysis bag was 500 Da, and the dialysis time was 72 h. The water was changed every 12 h to obtain a nitrogen-doped carbon quantum dot dispersion. The obtained nitrogen-doped carbon quantum dot dispersion liquid was dried at 60°C to obtain a concentrated liquid, and the concentrated liquid was freeze-dried at -80°C to obtain a nitrogen-doped carbon quantum dot solid.

Embodiment approach 3

[0027] Add 10.0 mL of triisopropanolamine into 60 mL of ethanol and stir, after stirring evenly, slowly add 2.0 mL of H 2 o 2 (30%), stirred to obtain a homogeneous solution. The obtained solution was slowly transferred into a 90 mL polytetrafluoroethylene-lined stainless steel autoclave, placed in a constant temperature drying oven, and reacted at 120 °C for 12 h to obtain a brownish-yellow carbon quantum dot stock solution. The formed carbon quantum dot stock solution was injected into a dialysis bag for dialysis. The molecular weight of the dialysis bag was 500 Da, and the dialysis time was 72 h. The water was changed every 12 h to obtain a nitrogen-doped carbon quantum dot dispersion. The obtained nitrogen-doped carbon quantum dot dispersion liquid was dried at 60°C to obtain a concentrated liquid, and the concentrated liquid was freeze-dried at -80°C to obtain a nitrogen-doped carbon quantum dot solid.

[0028] The example samples were characterized.

[0029] The morph...

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Abstract

The invention provides a preparation method of size-controllable nitrogen-doped carbon quantum dots, and belongs to the technical field of nanometer material science. The preparation method of the size-controllable nitrogen-doped carbon quantum dots is characterized in that triisopropanolamine serves as the raw material, a carburizing agent is added into ethanol solvent, a solvothermal reaction is conducted, filtering and dialyzing are conducted, and a nitrogen-doped carbon quantum dot dispersion solution can be obtained; concentrating and freeze drying are conducted, and nitrogen-doped carbon quantum dot solids are obtained, wherein the size of the carbon quantum dots can be controllable by controlling the addition amount of the carburizing agent. According to the preparation method of the size-controllable nitrogen-doped carbon quantum dots, the adopted raw materials are low in price and easy to obtain, the synthesizing method is simple and convenient in technology, low in preparation temperature and controllable in operation. Triisopropanolamine not only serves as a carbon source, but also serves as a nitrogen source, and the prepared nitrogen-doped carbon quantum dots have the good fluorescence property and are expected to be applied to the fields of photoelectric materials, bioimaging, fluorescent probes and the like.

Description

technical field [0001] The invention relates to a method for preparing size-controllable nitrogen-doped carbon quantum dots, belonging to the technical field of nanomaterials. Background technique [0002] Carbon quantum dots are new fluorescent carbon nanomaterials discovered in recent years with carbon as the skeleton structure. They are dispersed spherical nanoparticles with a size less than 10 nm. Compared with traditional fluorescent quantum dots and organic dyes, carbon quantum dots not only have good water solubility, superior fluorescence, strong stability, good light resistance, adjustable emission wavelength and other advantages, but also have a lower Toxicity and good biocompatibility, so it is expected to replace traditional fluorescent dyes and quantum dots in the future and be used in optoelectronic materials, biological imaging, fluorescent probes and other fields. [0003] In order to improve the fluorescence properties of carbon quantum dots and expand thei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65
CPCC09K11/0883C09K11/65
Inventor 王雅文樊彩梅曹永倩李双志
Owner TAIYUAN UNIV OF TECH
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