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A kind of blue fluorescent quantum dot and its preparation method and copper ion detection application

A technology of blue fluorescence and quantum dots, applied in the field of nanomaterials, can solve the problems of reduced sensitivity of copper ions and reduced number of amino groups

Active Publication Date: 2021-07-23
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of blue fluorescent quantum dot and its preparation method and copper ion detection application
  • A kind of blue fluorescent quantum dot and its preparation method and copper ion detection application
  • A kind of blue fluorescent quantum dot and its preparation method and copper ion detection application

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Example 1 Preparation of carbon quantum dots

[0051] The present invention used as a nitrogen-based polyethylenediamine dendritic polymer can be selected by commercially available products as a nitrogen source.

[0052] See figure 1 , Blue fluorescent quantum point NH of the present invention 2 -CDS preparation method, including the following steps:

[0053] Step 1: Preparation of G-PAMAM

[0054] 1) 4 mL of ethylenediamine and 10 mL of methanol were added to the round bottom flask and stirred for 5 min. After stirring, 16 ml of methyl acrylate was added dropwise to the above solution and reacted at 30 ° C for 24 h;

[0055] 2) After the reaction was completed, the methanol was removed by a rotary evaporator at 30 ° C, and three times were washed three times with methanol to remove a large amount of methyl acrylate. 10 ml of methanol was added to the above-mentioned solution and was dispersed uniform with ultrasound. A 16 mL of ethylenediamine was added dropwise to the dis...

Embodiment 2

[0065] Example 2 Characterization of carbon quantum dots

[0066] 1, average particle size and zeta potential characterization

[0067] Bare-CDS and NH were measured by Zen3600 Malvin Dynamic Light Scattering Granular Meter 2 -CDS's average particle size and Zeta potential of two samples, the test medium is water, and the test temperature is 25 ° C.

[0068] 2, TEM micro morphology and structural characterization

[0069] Take a small amount of Bare-CDS and NH 2The -CDS was added 2 ml of anhydrous methanol in a centrifuge tube and ultrasonic dispersion in a 5 ml of centrifuge tube, respectively, and the sample was uniformly dripped onto 400-mesh copper nets, and the sample morphology was observed under the 80 kV acceleration voltage of the TECNAi G2F20. Micro-morphological observations were performed using a transmission electron microscope (TEM), a dynamic light scattering particle meter (DLS), and Fourier infrared spectrometer (FT-IR). Micro-morphological observations were carri...

Embodiment 3

[0076] Example 3 Carbon dot detection copper ions

[0077] 1, copper ion responsive experiment

[0078] Due to NH 2 -CDS surface of the amino group can quickly capture the solution of the solution 2+ The copper ammonia complex is formed and covered with the surface thereof. According to the fluorescence internal rate effect, the formed copper ammonia complex is covered in NH. 2 -CDS surface. At this time, NH 2 The copper ammonia complex formed on the surface of the -CDS prevents it from receiving external ultraviolet stimulation, or when it receives foreign stimulation, it will prevent the emission of fluorescence. Therefore, when NH 2 -CDS capture Cu 2+ The copper ammonia complex formed thereof is changed to change its spectral behavior.

[0079] See Figure 4 , Figure 4 The A c e represents a carbon quantum point NH, respectively. 2 -CDS ultraviolet absorption spectroscopy, excitation spectrum and emission spectrum; B D f represent NH, respectively 2 -CDS and the copper ion bindi...

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Abstract

The invention discloses a blue fluorescent quantum dot, a preparation method and application thereof, and belongs to the technical field of nanomaterials. Preparation method: 1) using citric acid as a carbon source, using a polyethylene diamine dendrimer with an amino group as a nitrogen source, and adopting a decoction method to prepare a carbon quantum dot precursor; 2) using ethylene diamine as a modified molecule, Methyl acrylate was used as a linking molecule, and the precursor of carbon quantum dots was modified to obtain blue fluorescent quantum dots. The preparation method has reasonable route design, simple operation, good repeatability, and low equipment requirements; the prepared blue fluorescent quantum dots have good water solubility, high stability, and excellent fluorescence performance, and can be specifically used for detecting copper ions.

Description

Technical field [0001] The present invention belongs to the field of nanomaterials, and more particularly to a blue fluorescence quantum dot and a preparation method thereof. Background technique [0002] The life activities of any life substance in nature are inseparable from water. However, with the high-speed development of society, human depends on water resources is increasing, and the problem of unfair treatment of industrial waste causing water pollution caused by people. Because heavy metals are easy to enrich and deliver a huge threat to human ecological environment and life health with biological chain in biomers. Due to tin, copper, lead, zinc, mercury, chromium, and the like, and these heavy metals can be converted to substances that have greater bioteoxicity through microorganisms. Therefore, they have been included in the blacklist of control contaminants. The world governments and the United Nations environmental protection organizations have issued relevant provis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C09K11/02B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/025C09K11/65G01N21/6486
Inventor 黄赛朋成杰伟薛伟明李文帅温惠云
Owner NORTHWEST UNIV