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Simple green synthesis method of nitrogen-doped carbon quantum dots

A technology of carbon quantum dots and green synthesis, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as difficulty in obtaining carbon sources and expensive carbon sources, and achieve low cost, excellent fluorescence performance, and good repeatability

Active Publication Date: 2014-05-14
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention mainly aims at the problem that the carbon source for preparing carbon quantum dots by the bottom-up method is expensive and difficult to obtain, and the preparation process involves non-environmentally friendly reagents, and provides a simple and green synthesis method for nitrogen-doped carbon quantum dots

Method used

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  • Simple green synthesis method of nitrogen-doped carbon quantum dots
  • Simple green synthesis method of nitrogen-doped carbon quantum dots
  • Simple green synthesis method of nitrogen-doped carbon quantum dots

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Embodiment 1

[0034] (1) Weigh 1 gram of food-grade konjac flour (the main active ingredient content is about 58wt%, BIOSHARP Co.) and place it in a crucible, directly put it into a muffle furnace for calcination, the calcination temperature is 500 degrees Celsius, and the calcination time is 1.5 hours. The heating rate is 5 degrees Celsius per minute, and the sample is ground into powder after calcination;

[0035] (2) Disperse the powder obtained above in 10 ml of absolute ethanol, stir magnetically for 2 hours, vacuum filter with an organic microporous membrane with a pore size of 0.22 microns, and collect the filtrate;

[0036] (3) Use step (2) to disperse the filter cake in 10 ml of absolute ethanol again, stir magnetically for 2 hours, vacuum filter with an organic microporous membrane with a pore size of 0.22 microns, collect the filtrate, and repeat this step After 2 times, all the filtrates were combined and placed in a beaker and dried at 60 degrees Celsius;

[0037] (4) Add 25 m...

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Abstract

The invention discloses a simple green synthesis method of nitrogen-doped carbon quantum dots. Konjac flour, serving as a carbon source, is subjected to pyrolysis in air and solvent extraction to obtain the nitrogen-doped carbon quantum dots. The synthesized nitrogen-doped carbon quantum dots are easily dissolved in solvents such as ethanol, N,N-dimethyl formamide and dimethyl sulfoxide and can be ultrasonically dispersed in water, the particle size is 0.3-2.4 nm, the highest fluorescence quantum yield is 22%, and the yield is 3%-5%. The nitrogen-doped carbon quantum dots can emit blue light, green light and red light respectively under the excitation of ultraviolet light, blue light and green light, and the fluorescence property of the nitrogen-doped carbon quantum dots can be adjusted through the excitation light wavelength, concentration and pH value. The method is simple and easy to operate and can be applied to large-scale synthesis of carbon quantum dots while the cost is low. The synthesized nitrogen-doped carbon quantum dots can be applied to the development of living cells in vitro and the preparation of stimulus response materials, and have broad application prospects in multiple fields of biomarkers, biomedical imaging, bio-development, drug screening and detection, biochips, biosensing and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of nano fluorescent materials, and in particular relates to a green synthesis method of nitrogen-doped carbon quantum dots. Background technique [0002] As a new type of quantum dots, compared with traditional metal semiconductor quantum dots, carbon quantum dots have the advantages of good luminescence stability, low toxicity, good biocompatibility and easy surface modification, so they are widely used in biomarkers, biomedical imaging, etc. , Bioimaging, drug screening and detection, biochips, biosensing and other fields have important applications. [0003] At present, the methods for synthesizing carbon quantum dots can be mainly divided into two categories: top-down and bottom-up. Among them, the bottom-up method, that is, obtaining carbon quantum dots from organic matter by means of hydrothermal carbonization, microwave treatment, and chemical oxidation, has more advant...

Claims

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Application Information

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IPC IPC(8): C09K11/65
Inventor 毕红滕羲瑶
Owner ANHUI UNIVERSITY
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