Multi-color fluorescent carbon quantum dot as well as preparation method and application thereof

A carbon quantum dot and fluorescence technology, which is applied in the field of multicolor fluorescent carbon quantum dots and their preparation, can solve the problems of unstable bioimaging, toxic luminescence, and light damage in the biological field, and achieves that the purification method is simple, easy to operate, and easy to prepare. Low conditions and environmental requirements, less effect of acid and alkali environment

Pending Publication Date: 2021-01-15
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problems of toxicity and unstable luminescence when traditional organic dyes are applied in the biological field, and the photodamage of blue light to biological imaging, provides a multi-functional multi-color fluorescent carbon quantum dot,

Method used

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  • Multi-color fluorescent carbon quantum dot as well as preparation method and application thereof
  • Multi-color fluorescent carbon quantum dot as well as preparation method and application thereof
  • Multi-color fluorescent carbon quantum dot as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028]Step 1, weigh 0.2g of ammonium citrate and 0.5g of urea in a reaction vessel, add 12mL of dimethylformamide, stir well to obtain a transparent clear solution, then transfer to a 30mL autoclave and put in an oven , the temperature was set to 150 degrees Celsius, kept for 14 hours, and after cooling to room temperature, a blue carbon quantum dot solution was obtained.

[0029] Step 2, the above-mentioned blue carbon quantum dot solution is transferred to a centrifuge tube, and after centrifugation at a speed of 10000 rpm for 10 minutes, the centrifuged liquid is filtered to obtain a clear liquid; a mixed solution of petroleum ether and ethyl acetate ( v:v=3:1) wash the supernatant, then shake the solution evenly, and sonicate. This process was repeated 2-3 times to obtain the precipitation of blue carbon quantum dots. Part of the precipitate was dispersed in ethanol to form a quantum dot colloidal solution. The remaining precipitates were dissolved in water and freeze-dr...

Embodiment 2

[0036] Step 1, weigh 0.4g of ammonium citrate and 0.4g of urea in a reaction vessel, add 12mL of dimethylformamide, stir well to obtain a transparent clear solution, then transfer to a 30mL autoclave, and place in an oven , the temperature was set to 170 degrees Celsius, kept for 14 hours, and after cooling to room temperature, a green carbon quantum dot solution was obtained.

[0037] Step 2, the above-mentioned green carbon quantum dot solution is transferred to a centrifuge tube, and after centrifugation at a speed of 10000 rpm for 10 minutes, the centrifuged liquid is filtered to obtain a clear liquid; a mixed solution of petroleum ether and ethyl acetate (v :v=3:1) Wash the supernatant, then shake the solution well, and sonicate. This process was repeated 2-3 times to obtain the precipitation of green carbon quantum dots. Part of the precipitate was dispersed in ethanol to form a quantum dot colloidal solution. The remaining precipitates were dissolved in water and free...

Embodiment 3

[0044] Step 1, weigh 1.4g of ammonium citrate and 0.8g of urea in a reaction vessel, add 12mL of dimethylformamide, stir well to obtain a transparent clear solution, then transfer to a 30mL autoclave and put in an oven , the temperature was set to 200 degrees Celsius, kept for 14 hours, and after cooling to room temperature, a red carbon quantum dot solution was obtained.

[0045] Step 2, transfer the above-mentioned red carbon quantum dot solution to a centrifuge tube, centrifuge at a speed of 10,000 rpm for 10 minutes, then filter the centrifuged liquid to obtain a clear liquid; use a mixed solution of petroleum ether and ethyl acetate (v :v=3:1) Wash the supernatant, then shake the solution well, and sonicate. This process was repeated 2-3 times to obtain the precipitation of red carbon quantum dots. Part of the precipitate was dispersed in ethanol to form a quantum dot colloidal solution. The remaining precipitates were dissolved in water and freeze-dried to obtain red c...

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Abstract

The invention discloses a multi-color fluorescent carbon quantum dot and a preparation method and application thereof, and relates to a multi-color fluorescent carbon quantum dot and a preparation method thereof. The preparation method comprises the following steps of: putting ammonium citrate and urea into a reaction container, adding dimethylformamide, fully stirring to obtain a transparent clear solution, transferring the clear solution into a high-pressure kettle, putting the high-pressure kettle into a drying oven, and keeping the temperature at 150-200 DEG C for 14 hours to obtain a carbon quantum dot solution. The carbon quantum dot prepared by the invention has the advantages of controllable light emitting color, excellent optical performance, strong fluorescence, high quantum yield, stability, small influence of acid-base environment and the like. The raw materials of the multi-color carbon quantum dot prepared by the method are cheap and easily available, the experimental repeatability is high, the operation is simple, the preparation time is short, and large-scale production can be realized. The multi-color fluorescent carbon quantum dot is applied to the fields of bioluminescence labeling, white light illumination and the like.

Description

technical field [0001] The invention relates to luminescent nanometer materials, in particular to carbon quantum dots, in particular to a multifunctional multicolor fluorescent carbon quantum dot and its preparation method and application. Background technique [0002] Carbon nanomaterials are a research hotspot in the field of nanoscience and technology. Since the quasi-zero-dimensional carbon nanomaterial fullerene was reported in 1985, one-dimensional carbon nanotubes were discovered in 1991, and graphene with a two-dimensional structure was prepared in 2004. At the same time, Xu et al. observed fluorescent carbon nanoparticles for the first time in the process of preparing single-walled carbon nanotubes by purifying arc discharge in 2004. Through further research, the carbon nanoparticles are called carbon quantum dots. In 2006, Sun Yaping of Clementson University synthesized carbon quantum dots for the first time by laser etching. In 2007, carbon quantum dots with a ...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64H01L33/50
CPCC09K11/65H01L33/502G01N21/6428G01N2021/6439Y02B20/00
Inventor 周贤菊常乾洋李丽相国涛谢广新汪永杰江莎
Owner CHONGQING UNIV OF POSTS & TELECOMM
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