Preparation method and product of full-color carbon dots for multi-color fluorescent printing

A technology of carbon dots and fluorescence, applied in chemical instruments and methods, applications, household appliances, etc., can solve the problems of difficulty in obtaining long-wavelength fluorescent carbon dots, low fluorescence quantum yield of carbon dots, and difficulties in product separation and purification. Achieve excellent stability and practicability, simple preparation method, and strong fluorescence emission

Active Publication Date: 2018-09-28
JIANGNAN UNIV
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  • Abstract
  • Description
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AI Technical Summary

Benefits of technology

This patented technology allows creation of colorful materials that emit light over multiple colors simultaneously. These colored particles usually consist of tiny crystals or nanoparticles made from different chemicals called amorphous silicon (a type of material). They show strong visible lights when excited by ultraviolet rays emitted during laser excitation. By adjustment of these parameters, they may produce various types of specialized applications such as security tags, identification cards, sensors, etc., which could help improve their performance on specific areas where there needs them more effectively.

Problems solved by technology

Technological Problem: Current Solvent Therapeutic Technique called Fluid Lifting Technology involves creation of colored images by adding colorants onto paper during manufacturing process. These techniques involve use of expensive specialized equipment such as lasers and lamps, leading to increased costs associated with maintenance work and waste disposals. Additionally, current processes require multiple steps involving complicated procedures like heat transfer, filtrate maskings, etc., making it challenging to produce longer-lasting colors without compromising their effectiveness against counterfidulant attacks.

Method used

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  • Preparation method and product of full-color carbon dots for multi-color fluorescent printing
  • Preparation method and product of full-color carbon dots for multi-color fluorescent printing
  • Preparation method and product of full-color carbon dots for multi-color fluorescent printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 1g of citric acid and 2g of urea and dissolve them in 10mL of DMF, stir evenly, transfer the transparent solution to a 15mL stainless steel reaction kettle, seal it, put it in an oven, and heat it at 180°C for 6h to obtain Black carbon dot mixed solution. Centrifuge the resulting mixed solution of carbon dots at 9000rpm for 20min, remove the large black precipitate, use column chromatography to finely separate the mixed solution of carbon dots in the upper layer, and use the mixed solution of methanol and dichloromethane as the eluent agent, adjust the volume ratio (1:1-15) of the two, and a single blue, green, yellow and orange-red luminescent carbon dot solution can be obtained. The specific operation process is as follows: fill the chromatographic column with ordinary silica gel, add the mixed sample, rinse the sample with 100mL 1:15 eluent, then increase the polarity of the eluent, and use 100mL 1:12,1: 10. Rinse with 1:8 eluent. At this time, blue and green ...

Embodiment 2

[0039]Weigh 1g of citric acid and 2g of urea and dissolve them in 10mL of DMSO. After stirring evenly, transfer the transparent solution to a 15mL stainless steel reaction kettle. Black carbon dot mixed solution. The obtained mixed solution of carbon dots was centrifuged at 9000rpm for 20min, and after removing the large black precipitate, the mixed solution of carbon dots in the upper layer was finely separated by column chromatography. At this time, the mixed solution of methanol and dichloromethane is used as the eluent, and the volume ratio (1:1-15) of the two is regulated. The separation process is the same as in Example 1, and a single blue, green, yellow and orange-red can be obtained. Luminescent carbon dot solution. Finally, the eluent was removed by rotary evaporation to obtain a solid product.

[0040] The orange-red luminescent carbon dots were redispersed in water to prepare a solution with a carbon dot concentration of 1 mg / mL, and the quantum yield of the oran...

Embodiment 3

[0042] Weigh 1g of citric acid and 2g of urea and dissolve them in 10mL of acetone. After stirring evenly, transfer the transparent solution to a 15mL stainless steel reaction kettle. Dark brown carbon dot mixed solution. The obtained mixed solution of carbon dots was centrifuged at 9000rpm for 20min, and after removing the large black precipitate, the mixed solution of carbon dots in the upper layer was finely separated by column chromatography. At this time, the mixed solution of methanol and dichloromethane was used as the eluent, and the volume ratio of the two was adjusted (1:1-15). The separation process was the same as in Example 1, and a single blue and green luminescent carbon dot solution could be obtained. Finally, the eluent was removed by rotary evaporation to obtain a solid product.

[0043] Redisperse the blue and green luminescent carbon dots in water to prepare a solution with a carbon dot concentration of 1 mg / mL. The measured quantum yield of green lumines...

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Abstract

The invention provides a preparation method and a product of full-color carbon dots for multi-color fluorescent printing. Citric acid is used as a single carbon resource, a nitrogen-containing compound is added, and a solvothermal reaction is carried out for 6-8 hours for obtaining a full-color carbon dot mixture. The fine separation of blue, green, yellow and orange fluorescence carbon dots can be realized through the regulation and control of the volume ratio of methanol to dichloromethane by using a column chromatography method. The obtained carbon dots have excellent water solubility, light stability and luminosity, so that the obtained carbon dots can be used to prepare multi-color fluorescent ink, and multi-color printing is realized. The preparation process provided by the inventionis simple, the repeatability is strong, the reaction condition is mild, and the product has excellent stability and practicability.

Description

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Claims

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Application Information

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Owner JIANGNAN UNIV
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