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pH-sensitive red light carbon quantum dots in weak acid mode and preparation method thereof

A technology of carbon quantum dots and patterns, applied in the field of pH-sensitive red light carbon quantum dots and their preparation, can solve problems such as limited application, and achieve the effects of wide response range, simple operation steps, good solubility and dispersibility

Active Publication Date: 2020-01-03
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, synthesized carbon quantum dots usually emit intense blue-green and shorter-wavelength light with excitation wavelength dependence, which limits their applications in biomedical and optoelectronic devices

Method used

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  • pH-sensitive red light carbon quantum dots in weak acid mode and preparation method thereof
  • pH-sensitive red light carbon quantum dots in weak acid mode and preparation method thereof
  • pH-sensitive red light carbon quantum dots in weak acid mode and preparation method thereof

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Embodiment 1

[0022] The preparation of a pH-sensitive red light carbon quantum dot in weak acid mode in this embodiment includes the following steps:

[0023] 1) Weigh 216 mg of p-phenylenediamine and dissolve it in 10 mL of secondary water, then add 300 μL of concentrated HCl to the solution, and ultrasonically obtain a uniformly mixed solution.

[0024] 2) Transfer the above solution to a hydrothermal reaction kettle and react at 200°C for 10 hours. After the reaction stops, let it stand and cool to room temperature. Centrifuge to remove insoluble matter and take the supernatant, pass it through a 500-1000Da dialysis bag, and put it in a glass container. After at least three days of dialysis treatment, a pure aqueous solution of carbon quantum dots can be obtained.

[0025] 3) Freeze-drying the aqueous solution of carbon quantum dots to obtain purple powdery carbon quantum dots. Its relative quantum yield (based on rhodamine B) is 12.5%.

[0026] Structural characterization of the carb...

Embodiment 2

[0030] The preparation of a pH-sensitive red light carbon quantum dot in weak acid mode in this embodiment includes the following steps:

[0031] 1) Weigh 216 mg of p-phenylenediamine and dissolve it in 10 mL of secondary water, then add 250 μL of concentrated HCl to the solution, and ultrasonically obtain a uniformly mixed solution.

[0032] 2) Transfer the above solution to a hydrothermal reaction kettle, react at 210°C for 9 hours, wait for the reaction to stop and let it cool to room temperature, centrifuge to remove insoluble matter and take the supernatant, pass through a dialysis bag of 500-1000Da, and put it in a glass container After at least three days of dialysis treatment, a pure aqueous solution of carbon quantum dots can be obtained.

[0033] 3) Freeze-drying the aqueous solution of carbon quantum dots to obtain purple powdery carbon quantum dots. Its relative quantum yield (based on rhodamine B) is 9.1%.

Embodiment 3

[0035] The preparation of a pH-sensitive red light carbon quantum dot in weak acid mode in this embodiment includes the following steps:

[0036] 1) Weigh 216 mg of p-phenylenediamine and dissolve it in 10 mL of secondary water, then add 200 μL of concentrated HCl to the solution, and ultrasonically obtain a uniformly mixed solution.

[0037] 2) Transfer the above solution to a hydrothermal reaction kettle, react at 200°C for 8 hours, wait for the reaction to stop and let it cool to room temperature, centrifuge to remove insoluble matter, take the supernatant, pass through a 500-1000Da dialysis bag, and put it in a glass container After at least three days of dialysis treatment, a pure aqueous solution of carbon quantum dots can be obtained.

[0038] 3) Freeze-drying the aqueous solution of carbon quantum dots to obtain purple powdery carbon quantum dots. Its relative quantum yield (based on rhodamine B) is 6.4%.

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Abstract

The invention provides a weak acid mode pH sensitive type red light carbon quantum dot, and a preparation method and application thereof. The preparation method of the carbon quantum dot comprises thefollowing steps: 1) weighing p-phenylenediamine with certain mass, dissolving the p-phenylenediamine into secondary water, adding a small amount of concentrated HCl into the solution and performing ultrasonic treatment to obtain a uniformly mixed solution; 2) transferring the solution to a hydrothermal reaction kettle, standing after the reaction stops, cooling to room temperature, centrifuging to remove an undissolved substance, taking supernatant liquid, performing dialysis, and performing dialysis treatment in a glass container for at least three days to obtain the pure carbon quantum dotaqueous solution; and 3) freeze-drying the carbon quantum dot aqueous solution to obtain a purple powdered carbon quantum dot. In the carbon quantum dot, a pH titration curve takes on a double S model, so that the prepared carbon quantum dot has a double weak acid structural mode, contains two pieces of pKa, has wide response range on the pH value, and can be applied to preparation of a cell pH detection reagent.

Description

technical field [0001] The invention relates to a nano-luminescent material, in particular to a pH-sensitive red light carbon quantum dot in a weak acid mode and a preparation method and application thereof. Background technique [0002] As a measure of acidity, pH value plays a vital role in environmental protection, biological physiology, mining and industrial production by its fast and accurate measurement. At present, the methods for measuring pH mainly include pH test paper measurement method, electrode method and sensor method. Among them, although the pH test paper measurement method is simple and easy to implement, its accuracy is low, and it is greatly affected by subjective factors, which is not conducive to the accurate measurement of pH value. Compared with the pH test paper measurement method, the accuracy of the electrode method has been greatly improved, but there are disadvantages such as electrochemical interference, metal ion interference, and damage to ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00
Inventor 焦媛高首勤路雯婧丁媛媛高艺芳双少敏董川
Owner SHANXI UNIV
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