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Carbon-dot-based composite nanomaterials with controllable luminescent properties and their preparation methods and applications

A technology of composite nanomaterials and luminescent properties, applied in the field of materials engineering, can solve the problems of complex preparation process of optical materials, scarcity of preparation raw materials, uncontrollable optical properties, etc., and achieve the effect of simple preparation method, good stability and long life

Active Publication Date: 2018-08-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems in the prior art such as complex preparation process of optical materials, scarcity of preparation raw materials and uncontrollable optical properties, the present invention provides a carbon dot-based composite nanomaterial with controllable luminous performance and a preparation method thereof

Method used

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  • Carbon-dot-based composite nanomaterials with controllable luminescent properties and their preparation methods and applications
  • Carbon-dot-based composite nanomaterials with controllable luminescent properties and their preparation methods and applications
  • Carbon-dot-based composite nanomaterials with controllable luminescent properties and their preparation methods and applications

Examples

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Effect test

Embodiment 1

[0040] Example 1 Carbon dot-based composite nanomaterial with controllable luminescence performance and its preparation method

[0041] (1) Preparation of aqueous solution of carbon quantum dots with carboxyl groups on the surface

[0042] 1. Weigh 0.5g of folic acid and 1.0g of citric acid and dissolve them in 50ml of deionized water, stir thoroughly for 10 minutes, then place the obtained mixed solution in a polytetrafluoroethylene high-pressure sealed reaction kettle, and heat at 250°C for 4 hours. get the initial solution;

[0043] 2. Centrifuge the initial solution obtained above at 10,000 rpm for 20 minutes to remove the black precipitate, take the upper layer of brownish-yellow clear liquid, use a dialysis bag with a molecular weight cut-off of 500Da, and dialyze for 24 hours to obtain a pure aqueous solution of fluorescent carbon quantum dots;

[0044] 3. The carbon quantum dot aqueous solution obtained above was freeze-dried for 96 hours to obtain a fluorescent carbo...

Embodiment 2

[0056] Example 2 Carbon-dot-based composite nanomaterial with controllable luminescence performance and its preparation method

[0057] (1) Preparation of aqueous solution of carbon quantum dots with carboxyl groups on the surface

[0058] 1. Weigh 0.5g of folic acid and 0.2g of citric acid and dissolve them in 50ml of deionized water, stir thoroughly for 10 minutes, then place the obtained mixed solution in a polytetrafluoroethylene high-pressure sealed tank, and heat it at 240°C with a power of 700w for 4 hour, the initial solution was obtained;

[0059] 2. Centrifuge the initial solution obtained above at 10,000 rpm for 20 minutes to remove the black precipitate, take the upper layer of brownish-yellow clear liquid, use a dialysis bag with a molecular weight cut-off of 500Da, and dialyze for 24 hours to obtain a pure aqueous solution of fluorescent carbon quantum dots;

[0060] 3. The carbon quantum dot aqueous solution obtained above was freeze-dried for 96 hours to obtai...

Embodiment 3

[0072] Example 3 Carbon dot-based composite nanomaterial with controllable luminescence performance and its preparation method

[0073] (1) Preparation of aqueous solution of carbon quantum dots with carboxyl groups on the surface

[0074] 1. Weigh 0.5g of folic acid and 1.0g of citric acid and dissolve them in 50ml of deionized water, stir thoroughly for 10 minutes, then place the resulting mixed solution in a polytetrafluoroethylene high-pressure sealed reaction kettle, and heat at 240°C for 4 hours. get the initial solution;

[0075] 2. Centrifuge the initial solution obtained above at 10,000 rpm for 20 minutes to remove the black precipitate, take the upper layer of brownish-yellow clear liquid, use a dialysis bag with a molecular weight cut-off of 500Da, and dialyze for 24 hours to obtain a pure aqueous solution of fluorescent carbon quantum dots;

[0076] 3. The carbon quantum dot aqueous solution obtained above was freeze-dried for 96 hours to obtain a fluorescent carb...

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Abstract

The invention provides a carbon dot based composite nano-material with controllable luminescent properties, a preparation method and application thereof. The preparation method includes: adding cyanuric acid into a carbon quantum dot aqueous solution with a surface modified by carboxyl groups, or adding alkali metal hydroxide and cyanuric acid, stirring the obtained mixed solution, conducting centrifugation, collecting the precipitate, and performing freeze drying so as to obtain the carbon dot based composite nano-material with controllable luminescent properties. The preparation process provided by the invention is simple, low in cost, non-toxic and environment-friendly. By adjusting the pH value, the fluorescence luminous efficiency of the material can be greatly improved, and also the afterglow color and lifetime of the material can be changed. The carbon dot based composite nano-material with controllable luminescent properties provided by the invention has important application value in counterfeiting prevention, biosensing, display and lighting and other fields.

Description

technical field [0001] The invention relates to the field of material engineering, in particular to a carbon-dot-based composite nanomaterial with controllable luminous performance, a preparation method and application thereof. Background technique [0002] Carbon quantum dots (CQDs) are luminescent carbon particles with a particle size below 10nm and composed of dispersed spherical particles discovered in recent years. Since its discovery, due to its unique properties, it has aroused great interest of researchers. Carbon quantum dots have excellent properties different from traditional quantum dots, such as photoluminescence, low toxicity, chemical inertness and good biocompatibility, and have broad application prospects in optoelectronic devices, biological detection, medicine and other fields. One of the most concerned is its photoluminescent properties. However, due to the influence of the inherent properties of carbon dots, the luminescent properties of the carbon dot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C09K11/02
CPCC09K11/025C09K11/65
Inventor 岳冬梅谈静李旺张立群
Owner BEIJING UNIV OF CHEM TECH
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