Water-soluble carbon quantum dot and preparation method thereof

A carbon quantum dot and water-soluble technology, which is applied in the field of water-soluble carbon quantum dots and its synthesis, can solve the problems of low yield of carbon nanoparticles, and achieve the effects of short preparation cycle, good stability and good repeatability

Inactive Publication Date: 2013-06-26
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are often limited to complex processes or harsh preparation conditions, and some simple preparation methods are also accompanied by great energy

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  • Water-soluble carbon quantum dot and preparation method thereof
  • Water-soluble carbon quantum dot and preparation method thereof
  • Water-soluble carbon quantum dot and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0024] Example 1

[0025] (a) Take 4g of glucose powder as raw material, dissolve it in 35mL of deionized water, stir well until it is completely dissolved, then add 2mL of 0.03mol / L AgNO 3 Solution, fully stir for 5 minutes to obtain the precursor solution;

[0026] (b) Transfer the above-mentioned precursor solution to the polytetrafluoroethylene liner of a hydrothermal kettle, heat it in an oven at 180℃ for 2h after sealing, and cool to room temperature naturally to obtain a suspension;

[0027] (c) Centrifuge the above suspension at 8000r / min for 20min to obtain a clear solution, which is an aqueous solution A of water-soluble fluorescent carbon quantum dots. The solution is dialyzed with an ultrafiltration membrane with a molecular weight cut-off of 10kD. After vacuum drying, carbon is obtained. Quantum dots.

[0028] Refer to Figure 1, which is the emission spectrum of the water-soluble fluorescent carbon quantum dots prepared in this embodiment. As can be seen from Figur...

Example Embodiment

[0033] Example 2

[0034] (a) Take 4g of glucose powder as raw material, dissolve it in 35mL of deionized water, stir well until it is completely dissolved, then add 2mL of 0.03mol / L AgNO 3 Solution, fully stir for 5 minutes to obtain the precursor solution;

[0035] (b) Transfer the above-mentioned precursor solution to the polytetrafluoroethylene liner of a hydrothermal kettle, heat it in an oven at 180°C for 3 hours after sealing, and cool to room temperature naturally to obtain a suspension;

[0036] (c) Centrifuge the above suspension at 8000r / min for 20min to obtain a clear solution, which is an aqueous solution B of water-soluble fluorescent carbon quantum dots. The solution is dialyzed with an ultrafiltration membrane with a molecular weight cut-off of 10kD and dried under vacuum. Carbon quantum dots.

Example Embodiment

[0037] Example 3

[0038] (a) Take 4g of glucose powder as raw material, dissolve it in 35mL of deionized water, stir well until it is completely dissolved, then add 1mL of 0.03mol / L AgNO 3 Solution, fully stir for 5 minutes to obtain the precursor solution;

[0039] (b) Transfer the above-mentioned precursor solution to the polytetrafluoroethylene liner of a hydrothermal kettle, heat it in an oven at 180℃ for 2h after sealing, and cool to room temperature naturally to obtain a suspension;

[0040] (c) Centrifuge the above suspension at 8000r / min for 20min to obtain a clear solution, which is an aqueous solution C of water-soluble fluorescent carbon quantum dots. The solution is dialyzed with an ultrafiltration membrane with a molecular weight cut-off of 10kD and dried under vacuum. Carbon quantum dots.

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Abstract

The invention discloses a water-soluble carbon quantum dot and a preparation method thereof. The preparation method of the water-soluble carbon quantum dot comprises the following steps of: sealing a mixed solution to a hydrothermal kettle for carrying out hydrothermal reaction by using aldehyde group-containing saccharide carbohydrate as a carbon source and using noble metal salts as an oxidant and catalyst; centrifuging and separating the obtained product to obtain an aqueous solution of the carbon quantum dot; separating the aqueous solution through an ultra-filtration centrifugal tube or an ultra-filtration membrane, collecting the filtered solution, drying the filtered solution under vacuum to obtain the carbon quantum point. The carbon quantum dot prepared by the preparation method disclosed by the invention can stably exist in the aqueous solution for a long time, is uniform in dimension distribution, high in fluorescence intensity and adjustable in light-emitting wavelength with the laser wavelength. Meanwhile, the surface of the carbon quantum dot is rich in carboxyl and hydroxyl, easy to realize surface functionalization and capable of being extensively applied to the fields including the biological field, the chemical field, the material field and the like. The preparation method disclosed by the invention is simple, good in repeatability, easily available in materials, short in preparation period, low in cost and easy for popularization.

Description

technical field [0001] The invention relates to a water-soluble carbon quantum dot with adjustable fluorescence and a synthesis method thereof. Background technique [0002] Carbon quantum dots are a new type of nanomaterial with carbon as the skeleton structure discovered in 2004. Compared with traditional semiconductor quantum dots, carbon quantum dots, as a new type of luminescent nanomaterial, not only maintain the low toxicity of carbon materials, biological Good compatibility, etc., and has the advantages of adjustable luminescence range, large two-photon absorption cross section, good photostability, no light flicker, easy large-scale synthesis, etc., and basically does not damage cells, especially when labeling living organisms. Unique advantages, has been widely concerned. Compared with some organic biofuels, its advantages lie in its relatively high stability and strong resistance to photobleaching. The size of this new type of fluorescent carbon na...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65C01B32/15
Inventor 李伟峰周璇龙玉梅张敏陈流敏
Owner SUZHOU UNIV
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