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Nitrogen-doped yellow fluorescent carbon quantum dot and preparation method and application thereof

A carbon quantum dot and yellow fluorescence technology, which is applied in the field of nitrogen-doped yellow fluorescent carbon quantum dots and its preparation, can solve problems such as limited practicability, and achieve the effects of good solubility and dispersibility, simple preparation steps and low toxicity

Inactive Publication Date: 2018-11-13
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To date, the wavelengths of most CDs reported are in the blue and green regions, which greatly limits their practicality.

Method used

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  • Nitrogen-doped yellow fluorescent carbon quantum dot and preparation method and application thereof
  • Nitrogen-doped yellow fluorescent carbon quantum dot and preparation method and application thereof
  • Nitrogen-doped yellow fluorescent carbon quantum dot and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Step 1, weigh 0.32g aspartic acid and 0.45g glucose respectively and place in a beaker, then add 3mL sodium hydroxide (1mol / L) solution water, fully stir, obtain colorless transparent solution;

[0036] Step 2, placing the beaker containing the solution in an oil bath, heating to 150°C for 30-40 minutes to obtain a light yellow-brown solid;

[0037] Step 3, take out the beaker from the oil bath, cool naturally, add 20mL of secondary water to it, stir and dissolve to obtain a light yellow solution, filter to remove insoluble matter to obtain a clear dark brown solution, pass through a dialysis bag of 500-1000Da, place in 1000ml Dialyze in the beaker for 1 day to remove impurities, and change the water every 6 hours to obtain a pure aqueous solution of Y-CDs;

[0038] In step 4, the above-mentioned Y-CDs aqueous solution is freeze-dried to obtain a light brown Y-CDs solid. Taking rhodamine 6G as the standard substance, the relative quantum yield of the Y-CDs was measured...

Embodiment 2

[0040] The Y-CDs that embodiment 1 prepares is carried out TEM, infrared spectrum and XPS characterization (see Figure 1-3 ), the particle diameters of the Y-CDs prepared by the present invention are all less than 10nm, and the surface contains groups such as carboxyl, hydroxyl, amino groups. Perform UV absorption spectroscopy and fluorescence emission characterization (see Figure 4-5 ).

Embodiment 3

[0042] Get the Y-CDs aqueous solution (0.2mg / mL) 3mL prepared in Example 1 and place in the fluorescence cuvette, add 0.02mL (0.1mol / L) 18 kinds of common metal cation solutions respectively, mix uniformly, in the fluorescence photometer Scan the emission spectrum (λex=455nm, λem=541nm), and record the fluorescence intensity, such as Figure 6 Shown, Y-CDs on Co 2+ With good ion selectivity, Co 2+ The fluorescence of Y-CDs can be quenched. (See Figure 6 )

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Abstract

The invention provides a nitrogen-doped yellow fluorescent carbon quantum dot and a preparation method and application thereof, belonging to the technical field of detection of carbon quantum dots andmetal ions. The preparation method of the carbon quantum dot comprises the steps of putting glucose and aspartic acid in a beaker, adding a sodium hydroxide water solution, and stirring sufficientlyto obtain a clear solution; putting the beaker with the solution in oil bath, heating up to 150DEG C, and reacting for 30-40 minutes so as to obtain a solid; and naturally cooling and adding deionizedwater, stirring and dissolving to obtain a clear solution, dialyzing by a dialysis bag, so as to obtain a pure carbon quantum dot water solution, and freeze drying to obtain target carbon quantum dots. The prepared carbon quantum dots can be used in detection of cobalt ions, and also can be used in cell fluorescent imaging.

Description

technical field [0001] The present invention relates to the detection of carbon quantum dots and metal ions, in particular to the detection of nitrogen-doped carbon quantum dots and cobalt ions, in particular to a nitrogen-doped yellow fluorescent carbon quantum dot and its preparation method, and the carbon quantum dots in Applications in the detection of cobalt ions. Background technique [0002] As a new type of carbon nanomaterial, carbon quantum dots (CDs) have good water solubility, excellent optical properties, high fluorescence quantum yield, ultra-low cytotoxicity and remarkable biocompatibility, etc. Great attention and extensive research. Based on these excellent properties, it has potential applications in the fields of biological probes, cell imaging, and drug delivery. [0003] So far, the wavelengths of most CDs reported are in the blue and green regions, which greatly limits their practicality. Many literatures have synthesized CDs doped with heteroatoms (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64G01N21/78
CPCC09K11/65G01N21/6428G01N21/78G01N2021/6432
Inventor 张慧林高艺芳焦媛刘洋杨振华双少敏董川
Owner SHANXI UNIV
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