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Preparation method of amino carbon quantum dots for detecting 4-nitrophenol

A technology of amino carbon quantum, p-nitrophenol, applied in measurement devices, chemical instruments and methods, fluorescence/phosphorescence, etc., to achieve the effects of simple and feasible operation, high optical performance, and high conversion rate

Inactive Publication Date: 2016-03-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surfaces of these carbon quantum dots are all carboxyl groups, and the synthesis of amino carbon quantum dots has rarely been reported.

Method used

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  • Preparation method of amino carbon quantum dots for detecting 4-nitrophenol
  • Preparation method of amino carbon quantum dots for detecting 4-nitrophenol

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Add 2g of citric acid and 1g of polyethyleneimine into 30mL of deionized water, and fully dissolve to obtain a transparent solution. Then transfer the mixed solution to a hydrothermal reaction kettle with a volume of 50mL, place the reaction kettle in an oven, heat up to 160°C, react for 4 hours, and cool to room temperature to obtain aminocarbon quantum dots with high-performance fluorescent properties of the dispersion. The dispersion was centrifuged, and the supernatant was poured into a dialysis bag for dialysis. The dialysis was performed twice for 10 hours each time, and finally dried to obtain amino carbon quantum dots.

Embodiment 2

[0022] Add 2g of citric acid and 2g of polyethyleneimine into 40mL of deionized water, and fully dissolve to obtain a transparent solution. Then transfer the mixed solution to a hydrothermal reaction kettle with a volume of 50mL, place the reaction kettle in an oven, heat up to 200°C, react for 8 hours, and cool to room temperature to obtain aminocarbon quantum dots with high-performance fluorescent properties of the dispersion. The dispersion liquid was centrifuged, and the supernatant liquid was poured into a dialysis bag for dialysis, 5 times of dialysis, 15 hours each time, and finally dried to obtain aminocarbon quantum dots.

Embodiment 3

[0024] Add 2 g of citric acid and 1.5 g of polyethyleneimine into 35 mL of deionized water, and obtain a transparent solution after fully dissolving. Then transfer the mixed solution to a hydrothermal reaction kettle with a volume of 50mL, place the reaction kettle in an oven, heat up to 180°C, react for 6 hours, and cool to room temperature to obtain aminocarbon quantum dots with high-performance fluorescent properties of the dispersion. The dispersion liquid was centrifuged, and the supernatant liquid was poured into a dialysis bag for dialysis, and the dialysis was performed 3 times for 12 hours each time, and finally dried to obtain amino carbon quantum dots.

[0025] figure 1 The transmission electron microscope figure of the aminocarbon quantum dots prepared for the present invention; in the figure, it can be reflected that the carbon quantum dots are successfully synthesized, and have good dispersibility; most of the aminocarbon quantum dots obtained by the method in ...

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Abstract

The invention relates to a preparation method of amino carbon quantum dots for detecting 4-nitrophenol and belongs to the technical field of preparation of novel nano-materials. The preparation method comprises the following steps: citric acid and polyethyleneimine in certain mass are dissolved in water firstly, and a transparent solution is obtained; then the solution is transferred into a hydrothermal reaction kettle, the hydrothermal reaction kettle is placed in an oven for reaction, and a dispersion liquid of the amino carbon quantum dots is obtained through cooling; the dispersion liquid is centrifuged, a supernatant is injected into a dialysis bag for dialysis, dialysis is performed for multiple times, and the amino carbon quantum dots are obtained through drying. The amino carbon quantum dots prepared with the method have very good stability and optical properties as well as 4-nitrophenol recognition capacity; the preparation method adopts simple equipment, is simple, convenient and feasible to operate, high in yield, high in conversion rate and fluorescence yield and good in repeatability, and adopted materials are environment-friendly and pollution-free.

Description

technical field [0001] The invention relates to a preparation method of amino carbon quantum dots for detecting p-nitrophenol, belonging to the technical field of preparation of new nanometer materials. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are a kind of element composed of II-VI group (such as CdSe and CdTe) or III-V group (such as InP and InAs) or IV-VI group (such as PbS and PbSe) elements, A semiconductor nanoparticle with a three-dimensional diameter of about 10nm that can generate fluorescence when irradiated with excitation light. In addition to surface effect, volume effect, dielectric confinement effect, quantum size effect and macroscopic quantum tunneling effect, quantum dots also have excellent optical properties such as wide absorption spectrum, narrow emission spectrum and large Stokes shift. For this reason, quantum dots have been successfully used in fields such as analytical detection, biomedicine, and fluores...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64
CPCC09K11/65G01N21/6402
Inventor 郝桐帆周志平聂仪晶
Owner JIANGSU UNIV
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