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A kind of synthetic method of polysiloxane modified carbon quantum dot

A synthesis method and technology of carbon quantum dots, applied in chemical instruments and methods, nanotechnology for materials and surface science, luminescent materials, etc., can solve the problem of single types of compounds on the surface of carbon quantum dots, low fluorescence quantum efficiency, Poor water solubility of polymers and other problems, to achieve the effect of cheap raw materials, high fluorescence intensity, and short preparation cycle

Active Publication Date: 2019-10-22
SHANGQIU NORMAL UNIVERSITY
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the relatively single fluorescent color emitted by the prepared carbon quantum dots in the above-mentioned prior art, the fluorescence quantum efficiency is low, and the fluorescence intensity is greatly attenuated after a short period of storage, and it is used for carbon quantum dots. A method for the synthesis of polysiloxane-modified carbon quantum dots was proposed due to problems such as the relatively single types of surface-modified compounds.
The invention utilizes the emulsion system formed by polymers and surfactants to effectively solve the problem of poor water solubility of polymers, realize its modification of the surface of carbon quantum dots, enrich the types of surface modification materials for carbon quantum dots, and broaden the use of modified carbon quantum dots in various fields. Field of application

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  • A kind of synthetic method of polysiloxane modified carbon quantum dot
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  • A kind of synthetic method of polysiloxane modified carbon quantum dot

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[0033] The specific embodiment of the present invention provides a kind of synthetic method of polysiloxane modified carbon quantum dot, synthetic method comprises the following steps:

[0034] 1) Prepare citric acid solution: add citric acid to deionized water, stir until citric acid is fully dissolved into deionized water;

[0035] 2) Adding the polysiloxane emulsion to the citric acid solution in step 1), stirring evenly to obtain a mixed solution, and then placing the mixed solution in a constant temperature drying oven for hydrothermal reaction to obtain a light yellow solution;

[0036] 3) Suction filter the light yellow solution in step 2) to obtain a light yellow transparent filtrate, and dilute the light yellow transparent filtrate with deionized water to obtain a polysiloxane-modified carbon quantum dot solution.

[0037] Further preferably, in step 1), 2 g of citric acid is dissolved in 25 ml of deionized water.

[0038] Further preferably, in step 2), polysiloxane...

Embodiment 1

[0045] 1) Prepare citric acid solution: add 2 g of citric acid to 25 ml of deionized water, and stir until the citric acid is fully dissolved in the deionized water;

[0046] 2) Add polysiloxane emulsion with a volume of 12.5mL to the citric acid solution in step 1), stir for 30min, and stir evenly to obtain a mixed solution, then take 30mL of the mixed solution and place it in a constant temperature drying box for hydrothermal reaction. A light yellow solution was obtained; specifically: the mixed solution was placed in a polytetrafluoroethylene liner of a reactor for hydrothermal reaction, the temperature of the thermal reaction was set at 180° C., and the reaction time was set at 8 hours.

[0047] 3) Suction filter the light yellow solution in step 2) to obtain a light yellow transparent filtrate, and dilute the light yellow transparent filtrate 100 times with deionized water to obtain a polysiloxane-modified carbon quantum dot solution.

[0048] In order to further illustr...

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Abstract

The invention provides a synthesis method of a polysiloxane modified carbon quantum dot. The method comprises the following steps: firstly, feeding citric acid into deionized water, stirring the citric acid to enable the citric acid to be sufficiently dissolved; secondly, feeding polysiloxane emulsion into the citric acid solution, uniformly stirring the polysiloxane emulsion, and then laying thepolysiloxane emulsion into a 120 to 180 DEG C constant temperature drying box, so as to be reacted for 4 to 12h, to obtain light yellow solution; thirdly, performing suction filtration on the light yellow solution, so as to obtain yellow light transparent filter liquor, and diluting the yellow light transparent filter liquor for 100 times through deionized water, so as to obtain the polysiloxane modified carbon quantum dot. The quantum dot has the advantages of cheap synthesis materials, high simpleness in operation, high fluorescence intensity, good stability, good biocompatibility, no pollution and no toxic action, and has great potential application value in terms of fluorescence probes, biological markers and imaging and pathological detection. The fluorescence quantum yield of the quantum dot can reach 80 percent or more.

Description

technical field [0001] The invention belongs to the technical field of nano-luminescent materials, and in particular relates to a method for synthesizing polysiloxane-modified carbon quantum dots. Background technique [0002] Carbon quantum dots are another new type of nanomaterial after fullerene, carbon nanotubes, and graphene. Carbon quantum dots refer to quasi-spherical carbon nanofunctional materials with a size below 10nm. Carbon quantum dots have the advantages of good water solubility, superior chemical inertness, low toxicity, easy functionalization, unique luminescent properties, good biocompatibility and photobleaching resistance, so carbon quantum dots are expected to become an alternative Fluorescent organic dyes and traditional semiconductor quantum dots are ideal fluorescent probes and biomarker materials, especially in medical fields such as cell labeling and long-term dynamic visualization and imaging of living bodies, which have unique advantages. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/65B82Y20/00B82Y30/00B82Y40/00
Inventor 王科峰魏伟司丹杰翟腾飞瞿鹏徐茂田
Owner SHANGQIU NORMAL UNIVERSITY
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