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Fluorescent carbon dots, and fused salt preparation method and application thereof

A technology of fluorescent carbon dots and carbon dots, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of complex preparation process, low yield, and poor controllability of carbon dot size, and achieve simple equipment and extensive carbon sources. , the effect of uniform particle size distribution

Inactive Publication Date: 2016-04-27
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both methods have problems such as low yield, high cost, complex preparation process, and poor controllability of the prepared carbon dot size.

Method used

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  • Fluorescent carbon dots, and fused salt preparation method and application thereof
  • Fluorescent carbon dots, and fused salt preparation method and application thereof
  • Fluorescent carbon dots, and fused salt preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weighing of molten salt: select sodium nitrate-potassium nitrate-sodium nitrite triple molten salt system, and weigh in a mass ratio of 7:53:40;

[0034] (2) Weigh sucrose according to 6% of the total mass in (1);

[0035] (3) Fully mix (1) sodium nitrate, potassium nitrate and sodium nitrite with sucrose carbon source to obtain 5 g of the mixture, put it in a crucible, put it into a heating furnace, and heat at 180 ° C for 8 h.

[0036] (4) Take 5g of the heat-treated mixture, add 50ml of deionized water to dissolve it completely, transfer it to a dialysis bag for dialysis, select a molecular weight cut-off of 3500MW, and dialyze for 3 days. The required fluorescent carbon dots are obtained in the solution after centrifugal dialysis, and take the dialysis bag The medium solution is preserved, and the molten salt in the dialysis cup can be recycled and reused.

[0037] (5) The solution in the dialysis bag was diluted 10, 20, 30, 40 times with deionized water, and t...

Embodiment 2

[0041] (1) Weighing of molten salt: select potassium nitrate-sodium nitrite molten salt system, and weigh at a mass ratio of 9:10;

[0042] (2) Weighing glucose according to 2% of the total mass in (1);

[0043] (3) (1) Potassium nitrate and sodium nitrite were fully mixed with glucose carbon source to obtain a treated mixture, 5 g of the mixture was placed in a crucible, put into a heating furnace, and heated at 150° C. for 8 hours.

[0044] (4) After heating, add 50ml of deionized water to the crucible to dissolve completely, then transfer to a dialysis bag for dialysis, select a molecular weight cut-off of 3000MW, and dialysis for 3 days, obtain the required fluorescent carbon dots in the solution after centrifugal dialysis, and take the dialysis bag The solution in the bag is preserved, and the molten salt in the dialysis cup can be recycled and reused.

[0045] (5) The solution in the dialysis bag was diluted 10, 20, 30, and 40 times with deionized water, and the charact...

Embodiment 3

[0049] (1) Weighing of molten salt: choose sodium nitrate-potassium nitrite molten salt system, and weigh according to the mass ratio of 1:1;

[0050] (2) Weigh citric acid according to 11% of the total mass in (1);

[0051] (3) Fully mix (1) sodium nitrate and potassium nitrite with citric acid carbon source to obtain the treated mixture, put 5 g of the mixture in a crucible, put it into a heating furnace, and heat at 160°C for 4 hours.

[0052] (4) After heating, add 100ml of deionized water into the crucible to completely dissolve it, then transfer it to a dialysis bag for dialysis, select a molecular weight cut-off of 5000MW, and dialysis for 2 days. The solution in the bag is preserved, and the molten salt in the dialysis cup can be recycled and reused.

[0053] The prepared carbon dots were characterized by fluorescence using Horiba Fluoromax-4 fluorescence spectrometer, such as Figure 11 shown. The optimum excitation wavelength is at 411nm, and the optimum emission ...

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Abstract

The invention provides fluorescent carbon dots, and a fused salt preparation method and application thereof. The fluorescent carbon dots have uniform particle size distribution; a main particle size is 2 to 4 nm and 85 to 98% of the carbon dots have a particle size of 2 to 4 nm; carbon dots with a particle size of 2 to 3 nm account for 50 to 82% of all the carbon dots; carbon dots with a particle size of 3 to 4 nm account for 15 to 40% of all the carbon dots; excitation wavelength is 340 to 440 nm, and emission wavelength dependent on the excitation wavelength is 470 to 700 nm. The fluorescent carbon dots have the advantages of high yield, low cost, simple preparation technology and good controllability of the sizes.

Description

technical field [0001] The invention relates to a fluorescent carbon point and its preparation method and application by molten salt method. Background technique [0002] Fluorescent carbon dots generally refer to new carbon nanomaterials with diameters less than 10 nanometers. Compared with traditional quantum dots, it has the advantages of low toxicity, stable chemical properties, excellent water solubility and biocompatibility, and easy functional modification, which also makes it rapidly rise in the carbon material family, and has attracted much attention. extensive attention. [0003] At present, the methods for preparing fluorescent carbon dots can be roughly classified into two types: top-down and bottom-up synthesis. The top-down synthesis method usually destroys the large carbon frame structure into small carbon frame structure materials, such as electrochemical methods to corrode the surface of carbon fibers (such as LeiB, Zhi-LingZ, Zhi-QuanT, et al. Electrochem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65
CPCC09K11/65
Inventor 吕春祥李利平
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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