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A kind of fluorescent carbon quantum dot and its preparation method and application

A technology of carbon quantum dots and fluorescence, applied in the field of fluorescent carbon quantum dots, can solve the problems of unfavorable scale production, complex operation, high cost, etc., and achieve the effect of low price, simple operation and stable optical properties

Inactive Publication Date: 2016-09-28
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Top-down methods mainly include arc discharge, laser ablation, electrochemical oxidation, etc. These methods often require strict experimental conditions, high cost, and complicated operation; bottom-up methods mainly include hydrothermal synthesis, microwave method, etc. , ultrasonic method, etc., but most of the carbon quantum dots prepared by this type of method require strict post-processing technology, which is not conducive to large-scale production

Method used

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  • A kind of fluorescent carbon quantum dot and its preparation method and application
  • A kind of fluorescent carbon quantum dot and its preparation method and application
  • A kind of fluorescent carbon quantum dot and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Step 1, weigh 0.2682g of malic acid in a microwave reactor, then add 10mL of secondary water, stir well, and ultrasonically obtain a clear solution;

[0042] Step 2, the microwave reactor was placed in a microwave oven (700 watts) and reacted for 20 minutes under high heat to obtain a light yellow solid;

[0043] Step 3, take out the microwave reactor, cool naturally, add 20mL of secondary water into it, stir and dissolve to obtain a light yellow solution, remove insoluble matter by filtration to obtain a clear light yellow solution, and dialyze in a glass container through a 500-1000Da dialysis bag Treat for at least 3 days to remove impurities to obtain a pure aqueous solution of fluorescent carbon quantum dots;

[0044] In step 4, the fluorescent carbon quantum dot aqueous solution is freeze-dried to obtain the fluorescent carbon quantum dot, and its relative quantum yield (taking quinine sulfate as a standard) is 9.86%.

Embodiment 2

[0046] Weigh 0.2682g of malic acid in a microwave reactor, add 10mL of secondary water, then add 121μL of ethanolamine and stir thoroughly, and ultrasonically obtain a clear solution;

[0047] Step 2, the microwave reactor was placed in a microwave oven (700 watts) and reacted for 10 minutes under high heat to obtain a light brown solid;

[0048] Step 3, take out the microwave reactor, cool naturally, add 20mL of secondary water into it, stir and dissolve to obtain a light brown solution, remove insoluble matter by filtration to obtain a clear light brown solution, and dialyze in a glass container through a 500-1000Da dialysis bag Treat for at least 3 days to remove impurities to obtain a pure aqueous solution of fluorescent carbon quantum dots;

[0049] In step 4, the fluorescent carbon quantum dot aqueous solution was freeze-dried to obtain the fluorescent carbon quantum dot, and its relative quantum yield (taking quinine sulfate as a standard) was 15.13%.

Embodiment 3

[0051] Weigh 0.2682g of malic acid in a microwave reactor, add 10mL of secondary water, then add 163μL of ethanesulfonic acid, stir well, and ultrasonically obtain a clear solution;

[0052] Step 2, the microwave reactor was placed in a microwave oven (700 watts) and reacted for 5 minutes under high heat to obtain a light brown solid;

[0053] Step 3, take out the microwave reactor, cool naturally, add 20mL of secondary water into it, stir and dissolve to obtain a light brown solution, remove insoluble matter by filtration to obtain a clear light brown solution, and dialyze in a glass container through a 500-1000Da dialysis bag Treat for at least 3 days to remove impurities to obtain a pure aqueous solution of fluorescent carbon quantum dots;

[0054] In step 4, the fluorescent carbon quantum dot aqueous solution is freeze-dried to obtain the fluorescent carbon quantum dot, and its relative quantum yield (taking quinine sulfate as a standard) is 5.5%.

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Abstract

The invention discloses fluorescent carbon quantum dots as well as a preparation method and an application thereof. The preparation method of the carbon quantum dots comprises the steps of adding secondary water into malic acid (or malic acid and ethanol amine, or malic acid and ethane sulfonic acid), which serves as a raw material, carrying out ultrasonic treatment so as to obtain a clarified solution, putting the clarified solution into a microwave oven, reacting for 5-20 minutes so as to obtain solid, dissolving, filtrating, and dialyzing, so as to obtain undoped (or nitrogen-doped, or sulfur-doped) water-soluble fluorescent carbon quantum dots. The preparation process of the carbon quantum dots disclosed by the invention is simple, and the prepared carbon quantum dots are stable in optical property and good in biocompatibility. The carbon quantum dots disclosed by the invention can be applied to the fields of the analysis and detection on Fe<3+> in water, the biological imaging of living cells, fluorescent ink and the like.

Description

technical field [0001] The invention relates to fluorescent carbon quantum dots, specifically a fluorescent carbon quantum dot with malic acid as a carbon source, doped with nitrogen and sulfur elements and a preparation method thereof, and the use of carbon quantum dots in the analysis and detection of Fe in water bodies 3+ , live cell bioimaging and applications in fluorescent inks. Background technique [0002] In recent years, quantum dots have received great attention and extensive research due to their superior optical and electrical properties. As quasi-zero-dimensional nanomaterials, they have superior properties such as quantum confinement effects, surface effects, and size effects. Therefore, quantum dots It has been well applied in optical devices, electrical devices, biological imaging, and biological drug loading. Traditional quantum dots are mostly researched on semiconductor quantum dots (such as CdSe, PbTe, CdTe, etc.), and their applications in the field of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02C09K11/65B82Y30/00
Inventor 路雯婧弓晓娟武鑫刘洋董川双少敏
Owner SHANXI UNIV
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