Preparation method and application of nitrogen-doped carbon quantum dot and manganese dioxide composite material

A technology of carbon quantum dots and manganese dioxide, which is applied in the field of compound preparation of nitrogen-doped carbon quantum dots and manganese dioxide, can solve the problems of complex biosensor preparation process, low fluorescence, and long time, and achieve low cost , High luminous intensity, ensure the effect of uniformity

Pending Publication Date: 2021-08-03
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the preparation and application of single-doped nitrogen carbon quantum dots are still difficult, such as low purity, low fluorescence, complex preparation process of biosensors, long time and other disadvantages that affect its development.

Method used

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  • Preparation method and application of nitrogen-doped carbon quantum dot and manganese dioxide composite material
  • Preparation method and application of nitrogen-doped carbon quantum dot and manganese dioxide composite material
  • Preparation method and application of nitrogen-doped carbon quantum dot and manganese dioxide composite material

Examples

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Embodiment 1

[0044] A preparation method of nitrogen-doped carbon quantum dots and manganese dioxide composite material, comprising the following steps:

[0045](1.1) Weigh 0.58g of citric acid and 0.6g of urea, dissolve them in a solution of 10ml of N,N-dimethylformamide, and stir until the solution is clear;

[0046] (1.2) The resulting mixture was transferred to a 25ml polytetrafluoroethylene autoclave and heated at 160°C for 12 hours;

[0047] (1.3) Reactor is cooled to room temperature, takes out solution, puts into centrifuge and removes precipitation with 10000rpm centrifugation for 10 minutes;

[0048] (1.4) Petroleum ether and ethyl acetate are mixed in a ratio of 3:1 and poured into the supernatant, and the obtained precipitate is further purified by column precipitation;

[0049] (1.5) Use methanol and dichloromethane as column precipitation eluent, collect liquid and remove solvent with rotary evaporator, obtain CDs powder, Figure 2A is its transmission electron microscope i...

Embodiment 2

[0060] A preparation method of nitrogen-doped carbon quantum dots and manganese dioxide composite material, comprising the following steps:

[0061] (1.1) Weigh 0.54g of citric acid and 0.6g of urea, dissolve them in a solution of 9ml of N,N-dimethylformamide, and stir until the solution is clear; other steps are the same as in Example 1. The obtained structure is similar to Example 1.

Embodiment 3

[0063] A preparation method of nitrogen-doped carbon quantum dots and manganese dioxide composite material, comprising the following steps:

[0064] (1.1) Weigh 0.6g of citric acid and 0.6g of urea, dissolve them in a solution of 12ml of N,N-dimethylformamide, and stir until the solution is clear;

[0065] Other steps are with embodiment 1. The obtained structure is similar to Example 1.

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Abstract

The invention belongs to preparation of a nano composite material, and relates to a preparation method and application of a nitrogen-doped carbon quantum dot and manganese dioxide composite material, and the preparation method comprises the following steps: preparation of carbon quantum dots, and preparation of a nitrogen-doped carbon quantum dot-MnO2 nano composite material: adding distilled water into a flask, then sequentially adding ethanol, sodium dodecyl benzene sulfonate and sulfuric acid to form a mixed solution, carrying out heating treatment, slowly dropwise adding a potassium permanganate solution into the mixed solution, and continuously stirring; washing so that MnO2 nanosheets are obtained; dispersing the cleaned MnO2 nanosheets with negative electricity in deionized water, and keeping for later use; and adding the nitrogen-doped carbon quantum dot powder into the cleaned MnO2 nanosheet solution, and stirring to obtain the nitrogen-doped carbon quantum dot-MnO2 nano composite material. The preparation raw materials are easily available, and the preparation process is simple. The nitrogen-doped carbon quantum composite manganese dioxide fluorescent probe is constructed, is used for detecting the content of glutathione in vivo or in vitro, and has important value.

Description

technical field [0001] The present application relates to a nanocomposite material, in particular to a preparation method and application of nitrogen-doped carbon quantum dots and manganese dioxide composite. Background technique [0002] Carbon quantum dots (CDs) are a new type of fluorescent carbon nanomaterials, which not only have the excellent luminescent properties of traditional quantum dots, but also have good chemical stability, low toxicity and no pollution, and good biocompatibility. In recent years, biosensors have become an important technology in the field of analytical detection. Among them, the fluorescence sensor has a significant market prospect in the analysis and detection due to its simple operation, low cost and high sensitivity. However, the preparation and application of single-doped nitrogen carbon quantum dots are still difficult at present, such as low purity, low fluorescence, complex preparation process of biosensors, long time and other disadva...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02G01N21/64B82Y30/00B82Y20/00
CPCC09K11/65C09K11/025B82Y20/00B82Y30/00G01N21/6428
Inventor 郑莹莹廖小堃柳兵
Owner ZHEJIANG SCI-TECH UNIV
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