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Method for preparing controllable photoluminescence carbon dots by changing temperature

A technology of photoluminescence and temperature change, which is applied in the direction of luminescent materials, chemical instruments and methods, nano-carbon, etc., can solve the problem of difficult separation of carbon dot mixture, achieve good photobleaching resistance and stability, easy operation process, The effect of uniform composition

Inactive Publication Date: 2020-04-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing controllable photoluminescent carbon dots by changing the temperature, so as to overcome the defect that the carbon dot mixture is not easy to separate in the prior art

Method used

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  • Method for preparing controllable photoluminescence carbon dots by changing temperature
  • Method for preparing controllable photoluminescence carbon dots by changing temperature
  • Method for preparing controllable photoluminescence carbon dots by changing temperature

Examples

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Embodiment 1

[0029] In order to study the method for preparing blue fluorescent carbon dots in the present invention, select citric acid monohydrate as the carbon source, urea as a nitrogen dopant, weigh 1 g of citric acid monohydrate solid, 2 g of urea, and fully mix them in a nickel crucible , placed in an oven at 150°C for 2 h to obtain a crude product of carbon dots. Cool the synthesized carbon dots (CA-N-CDs) slightly, add 10ml of deionized water to dissolve, and centrifuge at a high speed of 10000r / min for 10min after the synthesized product is fully dissolved, and take the supernatant ; The centrifuged carbon dots (CA-N-CDs) supernatant solution is filtered and purified through a 0.22 micron microporous membrane to obtain a carbon dot solution.

[0030] The above-mentioned purified sample solution is diluted to an ultraviolet absorbance lower than 0.05, and the fluorescence intensity of the solution is detected to obtain the fluorescence spectrum of the carbon dot solution. From thi...

Embodiment 2

[0034] Study the method for preparing green fluorescent carbon dots in the present invention, modify the "calcination in an oven at 150°C for 2 hours" in Example 1 to "calcination in an oven at 180°C for 2 hours", and the rest are the same as in Example 1. A solution of carbon dots is obtained.

[0035] The above-mentioned purified sample solution is diluted to an ultraviolet absorbance lower than 0.05, and the fluorescence intensity of the solution is detected to obtain the fluorescence spectrum of the carbon dot solution. It can be seen that the prepared green carbon dot solution has an emission peak at 530nm in this spectrum (using In the ultraviolet absorption results, the maximum absorption peak is excited at 410nm), and has a strong fluorescence intensity. Observing the optical properties of carbon dots under the irradiation of ultraviolet light with the naked eye, you can see that they emit bright green light.

[0036] The purified product solution was lyophilized into...

Embodiment 3

[0039]In order to study the method for preparing blue fluorescent carbon dots in the present invention, select citric acid monohydrate as the carbon source, urea as a nitrogen dopant, weigh 1 g of citric acid monohydrate solid, 2 g of urea, and fully mix them in a nickel crucible , placed in an oven at 180°C for 0.2h to obtain a crude product of carbon dots. Cool the synthesized carbon dots (CA-N-CDs) slightly, add 10ml of deionized water to dissolve, and centrifuge at a high speed of 10000r / min for 10min after the synthesized product is fully dissolved, and take the supernatant ; The centrifuged carbon dots (CA-N-CDs) supernatant solution is filtered and purified through a 0.22 micron microporous membrane to obtain a carbon dot solution. The above-mentioned purified sample solution is diluted to an ultraviolet absorbance lower than 0.05, and the fluorescence intensity of the solution is detected to obtain the fluorescence spectrum of the carbon dot solution. It can be seen th...

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Abstract

The invention relates to a method for preparing controllable photoluminescence carbon dots by changing temperature. The method comprises the following steps: mixing citric acid monohydrate with urea,pyrolyzing, cooling, adding deionized water, dissolving, centrifuging, filtering, purifying, and freeze-drying to obtain the carbon dots. According to the method, blue and green water-soluble carbon dot solid powder with different fluorescence emission and high yield is obtained by controlling the pyrolysis temperature and time, and the components are uniform.

Description

technical field [0001] The invention belongs to the field of carbon nanomaterial preparation, in particular to a method for preparing controllable photoluminescent carbon dots by changing the temperature. Background technique [0002] Fluorescent materials have been widely concerned in the fields of materials science, chemistry and life sciences, and their application research in cell imaging and biochemical sensing has made great progress. In order to overcome the shortcomings of traditional organic dyes such as poor photostability and biological toxicity of semiconductor quantum dots, scientists have developed a new type of fluorescent material-carbon dots (CDs) by adjusting the size and surface chemical properties of carbon materials in recent years. . [0003] As a new type of fluorescent material, CDs have wider and continuous excitation spectrum, stable fluorescence performance, good biocompatibility and low toxicity, and can be functionalized by chemical modification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15
CPCB82Y20/00B82Y40/00C09K11/65C01B32/15
Inventor 周兴平马琛敖柳絮萦
Owner DONGHUA UNIV
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