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Green fluorescent quantum dot and preparation method and application thereof in copper ion detection

A green fluorescence and quantum dot technology, applied in the field of nanomaterials, can solve the problems of reduced sensitivity of copper ions, reduced number of amino groups, etc., and achieve the effect of reasonable route design, simple operation, and low equipment requirements

Active Publication Date: 2018-12-14
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of preparing carbon quantum dots, most of the amino groups will be oxidized, split or recombined, resulting in a reduction in the number of amino groups in the prepared carbon quantum dots and a decrease in the sensitivity of the detection of copper ions.

Method used

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  • Green fluorescent quantum dot and preparation method and application thereof in copper ion detection
  • Green fluorescent quantum dot and preparation method and application thereof in copper ion detection
  • Green fluorescent quantum dot and preparation method and application thereof in copper ion detection

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The preparation of embodiment 1 green fluorescent carbon quantum dots

[0035] Accurately weigh 1 g of urea and 2.839 g of gallic acid at a molar ratio of 1:1 between gallic acid and urea, and transfer them to a conical flask with a capacity of 5 mL. Add 1 mL of distilled water and 1-3 g of polyethylene glycol (PEG 400 ) and ultrasonically disperse it uniformly. After dispersing, place it in a microwave oven at 700W to react for 10 minutes. After the reaction is completed, wait for it to cool to room temperature, add an appropriate amount of distilled water to the Erlenmeyer flask and ultrasonically disperse it. The above dispersed samples were centrifuged at 10,000 rpm in a high-speed centrifuge and the supernatant was taken. The resulting supernatant was filtered through an aqueous 0.22 μm syringe filter plug to obtain a brown liquid. Transfer the filtered liquid to a dialysis bag with a molecular cut-off of 1000Da for 24 hours and freeze-dry to obtain green-emitt...

Embodiment 2

[0036] The characterization of embodiment 2 green fluorescent carbon quantum dots

[0037] 1. Characterization of average particle size and Zeta potential

[0038] The average particle size and Zeta potential of Green-CDs were measured by ZEN3600 Malvern dynamic light scattering particle size analyzer, and the test temperature was 25 °C.

[0039] 2. TEM microscopic morphology and structural characterization

[0040] Take a small amount of Green-CDs in a 5mL centrifuge tube, add 2mL of absolute ethanol to the centrifuge tube and sonicate for 5min, drop the sample evenly on a 400-mesh copper grid, and observe the morphology of the sample with a Tecnai G2F20 field emission transmission electron microscope at an accelerating voltage of 80KV.

[0041] See structure figure 1 as shown, figure 1 Middle (A) and (B) are high-resolution transmission electron microscope images of Green-CDs. It can be seen from the figure that the prepared Green-CDs are spherical and have good dispersio...

Embodiment 3

[0044] Example 3 Green fluorescent quantum dots detect copper ions

[0045] 1. Detection of Cu by Green-CDs 2+ Linear Relationship Research

[0046] Accurately weigh the Green-CDs prepared above and dissolve them in PBS (pH=7.4) buffer solution to obtain a concentration of 100 μg·mL -1 The Green-CDs mother solution; using the PBS (pH=7.4) buffer solution as the solvent to prepare successively with a concentration of 1mmol L by the serial dilution method -1 , 1 μmol L -1 Cu 2+ mother liquor.

[0047] Use the above prepared liquid as the mother solution and PBS (pH=7.4) buffer as the solvent to prepare the concentrations of 0, 0.01, 0.05, 0.25, 0.5, 0.75, 10, 50, 100, 250, 400, 600 μmol L -1 Cu 2+ Liquid to be tested. Add the prepared Green-CDs mother solution to the above test solution, so that the concentration of Green-CDs in the test solution is 10 μg·mL -1 . Measure the fluorescence spectrum of the prepared solution at 365 nm by fluorescence spectrophotometry.

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Abstract

The invention discloses a green fluorescent quantum dot and a preparation method and application thereof and belongs to the technical field of nano-materials. The preparation method comprises: preparing the green fluorescent quantum dot producing green lights through gallic acid as a carbon source, urea as a nitrogen source and PEG400 as a passivating agent through a microwave assisted method. Thebenzene ring structure of gallic acid contains three hydroxyl groups and one carboxyl group and thus the gallic acid is used as a carbon source and the fluorescent quantum dot prepared from the gallic acid as a carbon source has a fluorophore with a high conjugate structure and a high emission band. The preparation method has a reasonable route design, simple operation, good repeatability and lowrequirements on equipment. The prepared green fluorescent quantum dot has the advantages of good water solubility, high stability and excellent fluorescence performance and can be exclusively used for detecting copper ions.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a green fluorescent quantum dot and its preparation method and application. Background technique [0002] Copper is the first metal discovered by humans, and it is also the most widely used metal. It is widely used in agricultural and industrial products, such as: reagents, pesticides, plasticizers, emulsifiers and coatings. At the same time, copper also plays an important role in regulating the physiological activities of organisms. On the one hand, an appropriate amount of copper plays an irreplaceable role in normal physiological activities in organisms. In the body, copper is involved in many enzymes involved in physiological activities, such as ascorbate oxidase, superoxide dismutase, ascorbate oxidase, etc., which are inseparable from electron transfer redox reactions in biotransformation. At the same time, the metabolism of many enzymes is also cl...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65G01N21/6486
Inventor 黄赛朋成杰伟薛伟明李文帅温惠云
Owner NORTHWEST UNIV
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