Method for large-scale preparation of high-efficiency red/near-infrared emission fluorescent carbon dot

A technology for large-scale preparation of fluorescent carbon dots, applied in luminescent materials, chemical instruments and methods, nano-optics, etc., can solve the problems of low efficiency of red carbon dots, limited application of carbon dots, poor environmental stability, etc. Large-scale production, promotion of further application, low cost effect

Active Publication Date: 2019-03-22
ZHENGZHOU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there are still large questions regarding the efficient synthesis of fluorescent carbon dots with infrared and near-infrared emission
[0004] The maximum emission wavelength of the reported red fluorescent carbon dots does not exceed 760nm, and most of the fluorescence efficiency is very low, and the fluorescence intensity is weak, which greatly limits the application of carbon dots in the field of luminescence and biological imaging.
At present, there are few reports on high-efficiency red fluorescent carbon dots. Most of the synthesized carbon dots are almost synthesized in th

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  • Method for large-scale preparation of high-efficiency red/near-infrared emission fluorescent carbon dot
  • Method for large-scale preparation of high-efficiency red/near-infrared emission fluorescent carbon dot
  • Method for large-scale preparation of high-efficiency red/near-infrared emission fluorescent carbon dot

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Example Embodiment

[0029] Example 1

[0030] A method for large-scale preparation of high-efficiency red / near-infrared emitting fluorescent carbon dots, which is made of o-phenylenediamine and inorganic metal salt or o-phenylenediamine and dilute hydrochloric acid. The inorganic metal salt in the present invention may also be a crystalline inorganic metal salt.

[0031] The method for large-scale preparation of high-efficiency red / near-infrared emitting fluorescent carbon dots includes the following specific steps: grinding o-phenylenediamine and inorganic metal salt into uniformly granular powder, mixing the two uniformly to obtain a mixed powder; The powder is transferred to the inner lining of the reactor, then packaged, transferred to the drying box, and the reaction temperature and reaction time are set. After the reaction is completed, the temperature of the drying box is cooled to room temperature, and the reactor is taken out to obtain the product; the product is transferred to In the glass ...

Example Embodiment

[0041] Example 2

[0042] Grind 1.62g o-phenylenediamine and 0.23g crystalline aluminum chloride into a uniform particle powder, transfer the mixed powder to the inner lining of a 50ml reactor, then encapsulate it, transfer it to a drying box, set the reaction temperature to 200℃ and The reaction time is 12 hours. After the reaction is complete, the temperature of the drying box is cooled to room temperature, and the product is taken out; the product is transferred to a 200ml glass, and the product is washed with deionized water to remove unreacted precursors and certain impurities. After drying, a high-purity solid powder with red carbon dots is obtained. The product was weighed. In this example, 1.57 g of carbon dots were obtained, and the yield reached 85%.

[0043] The above products were tested by transmission electron microscope, red fluorescence, near-infrared fluorescence, four-photon fluorescence, and environmental stability spectroscopy. The results are as follows: Figu...

Example Embodiment

[0044] Example 3

[0045] Grind 1.15g o-phenylenediamine and 0.23g crystalline aluminum chloride into a uniform particle powder, transfer the mixed powder to the inner lining of a 50ml reactor, then encapsulate it, transfer it to a drying box, set the reaction temperature to 180℃ and The reaction time is 10h. After the reaction is completed, the temperature of the drying box is cooled to room temperature, and the reaction kettle is taken out to obtain the product; the product is transferred to a 200ml glass cup, and the product is washed with deionized water to remove unreacted precursors and certain substances. The impurities are then dried to obtain high-purity solid red carbon dot powder. The product was weighed. In this example, 1.15 g of carbon dots were obtained, and the yield reached 83%.

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Abstract

The invention discloses a method for large-scale preparation of high-efficiency red/near-infrared emission fluorescent carbon dots. The method comprises the following steps: o-phenylenediamine and aninorganic metal salt are ground into powder with uniform granules, the mixed powder of o-phenylenediamine and inorganic metal salt or a mixture of o-phenylenediamine and dilute hydrochloric acid is transferred to the lining of a reaction kettle, then packaged, and transferred to a drying oven, and the reaction temperature and reaction time are set, the temperature of the drying oven is cooled to room temperature after the reaction is completed, and the reaction kettle is taken out to obtain a product; and the product is washed and dried. Compared with the prior art, the method of the inventionhas the advantages of simple and convenient reaction, no purification, low cost, convenient mass production, good environmental stability, and convenient storage and transportation, and the preparedfluorescent carbon dots have excellent red fluorescence performance and four-photon fluorescence property, and realizes the fluorescence emission of the carbon dot in the near-infrared third window for the first time; and the carbon dot product can meet the fabrication requirements of various optoelectronic devices without complicated modification at the later stage.

Description

Technical field [0001] The invention belongs to the technical field of methods for preparing fluorescent carbon dots, and specifically relates to a method for large-scale preparation of high-efficiency red / near-infrared emitting fluorescent carbon dots. Background technique [0002] Nowadays, nanomaterials have gradually entered all areas of our lives. A variety of carbon-based fluorescent nanomaterials, such as carbon nanodots, fluorescent carbon nanotubes, polymer dots, graphene quantum dots and nanodiamonds, have been synthesized and applied. Carbon nanomaterials have aroused extensive research by scientists because of their huge potential in various technological applications. The excellent electronic and physicochemical properties of carbon dots have attracted great attention from researchers in recent years. [0003] As an emerging fluorescent nanomaterial, carbon dots have huge application potential in chemical sensing, bioimaging, drug delivery, photodynamic therapy, phot...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 宋世玉刘凯凯单崇新
Owner ZHENGZHOU UNIV
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