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Environment-friendly synthetic method of orange nitrogen/sulfur codoped carbon quantum dots

A carbon quantum dot, green synthesis technology, applied in the field of preparation of nano-fluorescent materials, can solve the problems of limiting the large-scale production and wide application of carbon quantum dots, and achieve the effects of short preparation cycle, good repeatability and uniform size distribution

Inactive Publication Date: 2015-03-04
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of these problems has greatly limited the large-scale production and wide application of carbon quantum dots.

Method used

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  • Environment-friendly synthetic method of orange nitrogen/sulfur codoped carbon quantum dots
  • Environment-friendly synthetic method of orange nitrogen/sulfur codoped carbon quantum dots
  • Environment-friendly synthetic method of orange nitrogen/sulfur codoped carbon quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Take 5 mmol L-cystine and 5 mmol L-serine as raw materials, add 20 ml of pure water, stir and dissolve to obtain a precursor solution.

[0032] (2) Put the precursor solution obtained in step (1) in a reaction kettle, seal it, react at 200° C. for 5 hours, and cool to room temperature.

[0033] (3) centrifuging the solution obtained in step (2) to obtain orange N-S co-doped carbon quantum dots.

[0034] See attached figure 1 , which is a transmission electron microscope image of N-S co-doped carbon quantum dots synthesized under this condition. It can be seen from the figure that the product is carbon quantum dots with uniform size, about 2.5 nanometers in size.

[0035] See attached figure 2 , which is the fluorescence spectrum of N-S co-doped carbon quantum dots synthesized under this condition. From figure 2 It can be seen that the prepared carbon quantum dots exhibit the strongest fluorescence emission at an excitation wavelength of 540nm, and the emissio...

Embodiment 2

[0038] (1) Weigh 5mmol L-cystine and 5mmol L-proline respectively, and then add 20ml of water to obtain the precursor solution:

[0039] (2) Put the precursor solution obtained in step (1) in the reaction kettle, seal it and react at 200°C for 2 hours, and cool to room temperature:

[0040] (3) Centrifuge the solution obtained in step (2) to obtain orange N-S co-doped carbon quantum dots:

[0041] See attached Figure 4 , which is a transmission electron microscope image of N-S co-doped carbon quantum dots synthesized under this condition. It can be measured from the figure that the size of the product is about 6 nm. Figure 5 The fluorescence spectrogram shows that the prepared carbon quantum dots show the strongest fluorescence emission at the excitation wavelength of 540nm, and the center of the emission peak is located at 607nm, which is orange light.

Embodiment 3

[0043] (1) Dissolve 5mmol L-cystine and 5mmol L-alanine silk in 20ml water to obtain a precursor solution:

[0044] (2) Put the precursor solution obtained in step (1) in a reaction kettle, seal it, react at 200° C. for 5 hours, and cool to room temperature.

[0045] (3) centrifuging the solution obtained in step (2) to obtain orange N-S co-doped carbon quantum dots.

[0046] See attached Figure 6 , which is a transmission electron microscope image of N-S co-doped carbon quantum dots synthesized under this condition. It can be measured from the figure that the size of the product is about 8 nm. Figure 7 The fluorescence spectrum shows that the prepared carbon quantum dots show the strongest fluorescence emission at the excitation wavelength of 540nm, and the center of the emission peak is located at 604nm, which is orange light.

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Abstract

The invention discloses an environment-friendly synthetic method of orange nitrogen / sulfur codoped carbon quantum dots. A preparation method comprises the step of carrying out polycondensation and carburization on amino acid at hydrothermal conditions by taking two different amino acids as raw materials and using water as a solvent. The environment-friendly synthetic method has the advantages that the operation is easy, the raw materials are environmental friendly, low in cost and easily available, and a product is short in preparation cycle and good in repeatability; the orange nitrogen / sulfur codoped carbon quantum dots are uniform in size and can emit orange lights, and the blank that the existing quantum dots are emitted at the wavelength is made up; the product can be widely applied to various fields of biologic imaging, cell marking, anti-counterfeiting and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of nano fluorescent materials, in particular to a green synthesis method of orange nitrogen and sulfur co-doped carbon quantum dots. Background technique [0002] Carbon quantum dots are a new type of nanostructured carbon material that was first unintentionally discovered by scientists from Clemson University in the United States in the process of purifying carbon nanotubes in 2004. Sun et al. successfully prepared carbon nanoparticles in the laboratory by laser etching in 2006, and officially named them "carbon quantum dots" (Carbon quantum dots, CQDs for short). At present, the research on carbon quantum dots is becoming a hot spot in the field of photoluminescence. [0003] Carbon quantum dots have the following characteristics: their particle size is generally less than 10nm, they have both down-conversion and up-conversion luminescence properties, excellent photostability, no photobleac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y40/00
Inventor 马德琨曾雅文聂祝平黄少铭
Owner WENZHOU UNIVERSITY
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