A preparation method of full-color carbon dots for multi-color fluorescent printing and products thereof

A technology of carbon dots and fluorescence, applied in chemical instruments and methods, applications, luminescent materials, etc., can solve problems such as difficulty in obtaining long-wavelength fluorescent carbon dots, difficulty in product separation and purification, and low fluorescence quantum yield of carbon dots. Achieve the effect of excellent stability and practicality

Active Publication Date: 2020-07-21
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the reported solvothermal method usually uses inorganic materials as carbon sources to synthesize carbon dots, and its emission wavelength is concentrated in the short wavelength region, that is, the blue light region below 500nm. It is difficult to obtain long-wavelength fluorescent carbon dots. Moreover, the currently disclosed This kind of solvothermal one-pot synthesis of full-color carbon dots has the disadvantage of difficult product separation and purification, and the fluorescence quantum yield of the prepared carbon dots is low, and the functionalization is not ideal.

Method used

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  • A preparation method of full-color carbon dots for multi-color fluorescent printing and products thereof
  • A preparation method of full-color carbon dots for multi-color fluorescent printing and products thereof
  • A preparation method of full-color carbon dots for multi-color fluorescent printing and products thereof

Examples

Experimental program
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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

technical field [0001] The invention belongs to the technical field of fluorescent nanometer materials, and in particular relates to a method for preparing full-color carbon dots for multi-color fluorescent printing and a product thereof. Background technique [0002] With the rapid development of the information age, people have entered an era of quick access to information. However, due to the overexposure of information, information leakage and duplication have become a serious concern for governments, enterprises, and individuals. Therefore, in this information age, information protection has become a top priority. In the past ten years, new multi-color fluorescent materials have become a major research hotspot, and they have been widely used in various fields. One of the important applications is as invisible ink for inkjet printing of multi-color patterns, which has played an important role in anti-counterfeiting technology. Anti-counterfeiting can prevent the leakag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C09D11/38
CPCB82Y20/00B82Y40/00C09D11/38C09K11/65
Inventor 王婵宋启军胡昙昙陈月月
Owner JIANGNAN UNIV
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