Nitrogen-doped carbon nanometer particle as well as preparation method and application thereof

A technology of nano-particles and nitrogen-doped carbon, applied in applications, chemical instruments and methods, household appliances, etc., can solve the problems of limited applications, strong fluorescence quenching, etc., and achieve simple preparation methods, low cost, and convenient mass production Effect

Inactive Publication Date: 2013-05-22
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbon nanoparticles containing surface passivation modifiers can have good dispersion characteristics in a dilute solution state and exhibit strong fluorescence characteristics, but in the aggregated state, the nanometer size effect of the material disappears, and it will exhibit strong fluorescence quenching , which greatly limits the application of such materials in solid-state light-emitting systems
[0004] In the prior art, there is no method for obtaining carbon nanoparticles with high fluorescence quantum efficiency without surface passivation modifiers

Method used

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  • Nitrogen-doped carbon nanometer particle as well as preparation method and application thereof
  • Nitrogen-doped carbon nanometer particle as well as preparation method and application thereof
  • Nitrogen-doped carbon nanometer particle as well as preparation method and application thereof

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preparation example Construction

[0034] A preparation method of nitrogen-doped carbon nano-dot fluorescent ink, comprising the following steps:

[0035] ① Dissolving organic compounds containing polycarboxylates or polyhydroxyl groups in excess ammonia water to obtain a solution;

[0036] ② The solution prepared in ① is reacted by microwave heating to obtain a brown-black viscous liquid;

[0037] ③The prepared brown-black viscous liquid is heated and dried to remove residual small molecular compounds to obtain nitrogen-doped carbon nanoparticles.

[0038] In step 1 of the present invention, there is no limit to the amount of organic compound and ammonia, as long as the organic compound can be dissolved, the present invention can be realized. Excessive ammonia can ensure a more complete reaction, so it is preferred to dissolve the organic compound containing polycarboxy or polyhydroxy in excess ammonia In the process, there is no limit to the amount of excess ammonia water, and the excess ammonia water will v...

Embodiment 1

[0047] combine Figure 1-4Illustrative Example 1

[0048] Preparation of nitrogen-doped carbon nanoparticles of the present invention:

[0049] ① Dissolve 3 grams of citric acid in 20 milliliters of ammonia water to obtain a solution;

[0050] ②Put the solution prepared in ① into a microwave oven, and heat it in a microwave with a power of 700W for 5 minutes to obtain a brown-black viscous liquid;

[0051] ③The prepared brown-black viscous liquid was placed in an oven at a temperature of 80 degrees Celsius and heated for 1 hour to obtain nitrogen-doped carbon nanoparticles.

[0052] figure 1 It is the transmission electron microscope picture of the nitrogen-doped carbon nanoparticles of Example 1 of the present invention, from figure 1 It can be seen that the diameter of the nitrogen-doped carbon nanoparticles prepared in the present invention is 5nm-60nm.

[0053] figure 2 It is the X-ray photoelectron spectrum diagram of the nitrogen-doped carbon nanoparticles of Exam...

Embodiment 2

[0057] Preparation of nitrogen-doped carbon nanoparticles of the present invention:

[0058] ① Dissolve 3 grams of glucose in 20 milliliters of ammonia water to obtain a solution;

[0059] ②Put the solution prepared in ① into a microwave oven, and heat it in a microwave with a power of 700W for 5 minutes to obtain a brown-black viscous liquid;

[0060] ③The prepared brown-black viscous liquid was placed in an oven at a temperature of 80 degrees Celsius and heated for 1 hour to obtain nitrogen-doped carbon nanoparticles.

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Abstract

The invention discloses a nitrogen-doped carbon nanometer particle as well as a preparation method and application thereof, belongs to the field of nanometer material science and is used for solving the technical problems that fluorescence quenching is easily caused to the aggregative state of the carbon nanometer particle due to surface passivation modifier which is added for the preparation of existing carbon nanometer particles. The nitrogen-doped carbon nanometer particle is prepared through a microwave method by using organic compounds containing polycarboxyl or polyhydroxy as materials and using ammonia water as a solvent and a nitrogen doping source. The invention further provides the application of the nitrogen-doped carbon nanometer particle as fluorescent ink and fluorescent glue. The preparation method disclosed by the invention is simple, low in cost, and convenient to realize large-scale production; the maximal fluorescent quantum efficiency of the solid film formed by the prepared fluorescent glue is as high as 84%; the prepared fluorescent ink is non-toxic, generates no precipitates after being placed for a long time, is strong in fluorescence characteristic and can be applied to various fields such as bio-imaging, biological product identification, information storage, information encryption, counterfeiting prevention, illumination and display, sensing and photovoltaic devices.

Description

technical field [0001] The invention relates to a nitrogen-doped carbon nanoparticle and its preparation method and application, belonging to the field of nanomaterial science. Background technique [0002] Carbon nanoparticles are a new type of nanomaterials, which have received more and more attention because of their unique advantages such as no light flickering, photobleaching resistance, non-toxicity, excellent biocompatibility and chemical stability (LuminescentCarbonNanodots : EmergentNanolights, SheilaN.Baker, GaryA.Baker, Angew.Chem.Int.Ed., 2010, 49, 6726), has potential application value in fields such as biological imaging, laser, optoelectronic devices. [0003] Carbon nanoparticles with fluorescent properties were initially obtained by laser bombardment of carbon nanotubes, but their fluorescence quantum efficiency is low. In order to obtain carbon nanoparticles with high fluorescence quantum efficiency, it is usually necessary to introduce surface passivation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09D11/00C09J11/04C09J129/04
Inventor 曲松楠刘星元
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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