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Multi-mode luminescent carbon dots as well as preparation method and application thereof

A multi-mode, carbon dot technology, applied in luminescent materials, chemical instruments and methods, fluorescence/phosphorescence, etc., can solve the problems of limited application, limited carbon dot concentration, reduced information encryption and anti-counterfeiting security, etc., to improve Preparation efficiency, wide application value, and good safety performance

Active Publication Date: 2021-07-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, dispersing carbon dots in polymers, inorganic crystals or porous materials, but the concentration of carbon dots in the matrix is ​​still limited
The second is that the carbon dots in the prior art only have a single light emitting mode, and its application in the fields of information encryption and anti-counterfeiting is limited
Although phosphorescent anti-counterfeiting has more advantages than fluorescent anti-counterfeiting, even phosphorescent carbon dot materials can be easily imitated, which reduces the security of information encryption and anti-counterfeiting

Method used

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  • Multi-mode luminescent carbon dots as well as preparation method and application thereof
  • Multi-mode luminescent carbon dots as well as preparation method and application thereof
  • Multi-mode luminescent carbon dots as well as preparation method and application thereof

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preparation example Construction

[0043] In one aspect of the present invention, there is also provided a method for preparing multi-mode luminescent carbon dots, comprising the following steps:

[0044] S10, mixing silk protein, alkali and water at a mass ratio of 1:(0.1-10):(10-500) to form a mixed solution;

[0045] S20, placing the mixed solution in a microwave reactor for microwave reaction, the microwave power is 100W-1000W, and the reaction time is 0.5min-10min; and

[0046] S30, purifying and drying the product after the microwave reaction.

[0047] The preparation method of multi-mode luminescent carbon dots provided by the embodiment of the present invention, on the one hand, uses microwaves to induce rapid oscillation of polar molecules in the reaction system, such as water, polar amino acid groups, etc., to generate a large amount of heat, thereby raising the temperature. At the same time, under the action of microwaves, the polar amino acid groups in the molecular chain of silk protein can be qui...

Embodiment 1

[0061] 1. Weigh 0.1g of sericin and 0.1g of sodium hydroxide respectively and place them in a beaker, then add 10mL of water, stir well, and ultrasonically obtain a clear solution.

[0062] 2. Place the beaker containing the clear solution in a microwave oven and react with a microwave power of 800W for 2.5 minutes to obtain a yellow solid.

[0063] 3. Take out the beaker, let it cool naturally, add 10mL of deionized water into it, stir, and neutralize it with 0.1mol / L hydrochloric acid until neutral, then centrifuge at 10000r / min for 10min, and take the supernatant.

[0064] 4. The supernatant was frozen by liquid nitrogen, and then freeze-dried in a freeze dryer at -50°C for 24 hours to obtain carbon dot powder.

Embodiment 2

[0066] 1. Weigh 0.1g of silk fibroin and 0.1g of sodium hydroxide into a beaker, then add 10mL of water, stir well, and ultrasonically obtain a clear solution.

[0067] 2. Place the beaker containing the clear solution in a microwave oven and react with a microwave power of 800W for 2.5 minutes to obtain a yellow solid.

[0068] 3. Take out the beaker, let it cool naturally, add 10mL of deionized water into it, stir, and neutralize it with 0.1mol / L hydrochloric acid until neutral, then centrifuge at 10000r / min for 10min, and take the supernatant.

[0069] 4. The supernatant was frozen by liquid nitrogen, and then freeze-dried in a freeze dryer at -50°C for 24 hours to obtain carbon dot powder.

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Abstract

The invention relates to a multi-mode luminous carbon dot as well as a preparation method and application thereof. The preparation method of the multi-mode luminous carbon dots comprises the following steps that: fibroin, strong base and water are mixed according to a mass ratio of 1: (0.1-10): (10-500) to form a mixed solution; the mixed solution is placed in a microwave reactor to be subjected to a microwave reaction, the microwave power ranges from 100 W to 1000 W, and the reaction time ranges from 0.5 min to 10 min; and a product obtained after the microwave reaction is purified and dried.

Description

technical field [0001] The invention relates to the technical field, in particular to a multi-mode luminescent carbon dot and its preparation method and application. Background technique [0002] Fluorescent encryption and anti-counterfeiting are currently the most widely used information encryption and anti-counterfeiting technologies. Because of their simple operation, low cost, and strong encryption, they are widely used in file encryption, bill anti-counterfeiting, coin anti-counterfeiting, electronic product anti-counterfeiting and other fields. However, with the development of technology, the traditional single mode of fluorescent information encryption and anti-counterfeiting is easy to be counterfeited and cracked, which can no longer meet the demand. As a low-dimensional carbon material, carbon dots have tunable luminescence properties, good stability, low toxicity, and good biocompatibility, and are widely used in light-emitting diodes, information encryption, anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64C09D7/61
CPCC09K11/65G01N21/643G01N21/6447C09D7/61
Inventor 张莹莹李硕
Owner TSINGHUA UNIV
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