Preparation method for fluorescent wavelength adjustable nitrogen and sulphur-co-doped carbon quantum dots

A carbon quantum dot and fluorescence wavelength technology, which is applied in the field of nitrogen and sulfur co-doped carbon quantum dot preparation, can solve the problems of high toxicity of carbon quantum dots, cumbersome preparation process, etc., and achieves short preparation period, simple and controllable preparation process, fluorescence good performance

Inactive Publication Date: 2019-08-02
YUNNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems in the prior art that the preparation process of doped carbon quantum dots is cumbersome and the carbon quantum dots co-doped with nitrogen and sulfur are highly toxic, the present invention provides a method for preparing nitrogen by one-step pyrolysis using methionine and L-glutamic acid as precursors. , Sulfur co-doped carbon quantum dots method

Method used

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  • Preparation method for fluorescent wavelength adjustable nitrogen and sulphur-co-doped carbon quantum dots
  • Preparation method for fluorescent wavelength adjustable nitrogen and sulphur-co-doped carbon quantum dots
  • Preparation method for fluorescent wavelength adjustable nitrogen and sulphur-co-doped carbon quantum dots

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Embodiment 1

[0042] A method for preparing nitrogen and sulfur co-doped carbon quantum dots with adjustable fluorescence wavelength, the specific steps are as follows:

[0043] (1) Take 2g of L-glutamic acid and 1g of methionine, grind and mix them evenly in an agate vessel, spread them on the bottom of the beaker, and then place them on a heating platform to raise the temperature to 200°C at a constant speed, and heat the reaction at a constant temperature of 200°C for 5 minutes The mixture in the beaker is dehydrated, carbonized, and discolored to obtain the reaction product A;

[0044](2) After the reaction product A in step (1) is cooled to room temperature, the passivating agent (ethanol) is added to the reaction product and mixed uniformly to obtain a mixed solution B;

[0045] (3) Place the mixed solution B in step (2) again on a platform with a temperature of 200° C. and heat it at a constant temperature for 3 minutes to obtain mixed solution C;

[0046] (4) The mixed solution C i...

Embodiment 2

[0052] On the basis of Example 1, the passivating agent was replaced by sodium hydroxide solution, the concentration of which was 3.6g / L, and other conditions remained unchanged.

Embodiment 3

[0054] On the basis of Example 1, the passivating agent was replaced by oxalic acid solution, the concentration of which was 3.6g / L, and other conditions remained unchanged.

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Abstract

The invention discloses a preparation method for fluorescent wavelength adjustable nitrogen and sulphur-co-doped carbon quantum dots, and belongs to the technical field of carbon quantum dots. The preparation method comprises the following steps: grinding and uniformly mixing L-glutamic acid and methionine in an agateware in a certain proportion; tilling the mixture at the bottom of a beaker, thenheating to 200 to 300 DEG C at a constant speed, and heating and reacting for 5 to 20 minutes in the temperature range to obtain a reaction product A; cooling the reaction product A to a room temperature; adding a passivating agent into the reaction product A, and uniformly mixing to obtain a mixed solution B; heating to enable the mixed solution B to react for 2 to 10 minutes at 200 to 300 DEG Cto obtain a mixed solution C; cooling the mixed solution C to a room temperature; performing centrifugal treatment; and standing, and dialysing through a dialysis bag to remove unreacted raw materials and impurities to obtain the nitrogen and sulphur-co-doped carbon quantum dots. The preparation process disclosed by the invention is simple and controllable; the fluorescent wavelength of the carbon quantum dots can be regulated and controlled by changing preparation conditions or the passivating agent so as to cover the wavebands of green light, yellow light and red light to meet actual application requirements.

Description

technical field [0001] The invention relates to a method for preparing nitrogen and sulfur co-doped carbon quantum dots with adjustable fluorescent wavelength, and belongs to the technical field of carbon quantum dots. Background technique [0002] Carbon quantum dots (carbon quantum dots, CQDs) is a carbon nanomaterial discovered in 2004. It is a newcomer to nanomaterials. It has superior fluorescence characteristics and unique chemical, electronic and optical properties. Compared with traditional dye molecules and semiconductor quantum dots, it not only has good photostability and scintillation photobleaching performance, but also has important characteristics such as low toxicity, low cost, biocompatibility and good photostability. Therefore, CQDs can be widely used in many fields such as optoelectronic devices, energy conversion, photocatalysis, sensors, bioimaging, cell labeling, and drug delivery, and have great application potential and broad prospects, and have attra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/0883C09K11/65
Inventor 唐菊张晋李文丽肖瑶李迎富石培光
Owner YUNNAN UNIV
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