Dual-emission fluorescent carbon dot and preparing method and application thereof

A dual-emission fluorescence, carbon dot technology, applied in luminescent materials, fluorescence/phosphorescence, chemical instruments and methods, etc., can solve the problems of expensive and complicated equipment, complicated operation, etc., and achieve low price, stable optical properties, and synthetic steps. simple effect

Active Publication Date: 2019-05-21
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have some unavoidable defects, such as expensive and complicated equipment, complicated operation, and time-consuming, which limit their application.

Method used

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  • Dual-emission fluorescent carbon dot and preparing method and application thereof
  • Dual-emission fluorescent carbon dot and preparing method and application thereof
  • Dual-emission fluorescent carbon dot and preparing method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Step 1, weigh 0.2g of spinach juice solid powder and 2mL of ethylenediamine respectively and place them in the reaction kettle, then add 20mL of secondary water, stir well, and ultrasonically obtain a clear solution;

[0029] Step 2, place the reaction kettle with the clear solution in an oven, heat at 120°C for 12 hours to obtain a brown solution;

[0030] Step 3: Take out the reaction kettle, cool it down naturally, filter to remove insoluble matter to obtain a clear solution, pass through a 500-1000Da dialysis bag, dialyze in a glass container for 1 day, and change the water every 4 hours to obtain pure carbon dots aqueous solution;

[0031] Step 4, freeze-drying the carbon dot aqueous solution to obtain a carbon dot solid, and its relative quantum yield (based on quinine sulfate) is 22.16%.

Embodiment 2

[0033] Fluorescent carbon dots prepared in Example 1 were characterized by fluorescence excitation emission and ultraviolet absorption spectrum (see figure 1 ), for TEM, IR and XPS characterization (see Figure 2-4 ), the particle diameters of the fluorescent carbon dots prepared by the present invention are all less than 10nm, and the surface contains groups such as carboxyl, hydroxyl, amino groups.

Embodiment 3

[0035] Get the fluorescent carbon dot aqueous solution (50 μ g / mL) 1.8mL that embodiment 1 prepares and place in the fluorescence cuvette, add 18 kinds of common metal ion solutions (10mmol / L) of 0.2mL respectively, mix homogeneously, in the fluorescence photometer Scan the emission spectrum (λex=391nm), and record the fluorescence intensity, such as Figure 5 As shown, carbon quantum dots on Pb 2+ Has good ion selectivity, Pb 2+ The fluorescence at 651nm of the carbon quantum dots can be quenched, and the fluorescence recovers after adding PPi. In order to calculate the carbon dots vs. Pb 2+ and the fluorescence detection range of PPi, get the fluorescent carbon dot aqueous solution (50 μ g / mL) 1.8mL that embodiment 1 prepares and place in the fluorescence cuvette, add the Pb of 0.2mL different concentrations (from low to high) respectively 2+ and PPi solution, mix uniformly, scan the emission spectrum (λex=391nm) in the fluorescence photometer, when Pb 2+ In the presence...

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Abstract

The invention provides a dual-emission fluorescent carbon dot and a preparing method and application thereof. The preparing method of the carbon dot includes the steps that 1) a certain mass of spinach-liquid solid powder is weighed and dissolved in secondary water, then ethanediamine is added into a solution, the mixture is fully stirred, ultrasound is conducted, a clear solution is obtained, andthe mass ratio of the spinach-liquid solid powder to the secondary water to the ethanediamine is (5-20):100:(8-10) ; 2) the solution is transferred in a hydrothermal reaction kettle, and reacts for 8h at the temperature of 120 DEG C; 3) the reaction kettle is taken out, naturally cooled and filtered, insoluble substances are removed, a clear solution is obtained, through a dialysis bag of 500 Dato 1,000 Da, dialysis treatment is conducted in a glass container, water is replaced one time every 4 hours, and a pure carbon-dot water solution is obtained; 4) the water solution is frozen and dried, and then the target carbon dot is obtained. The preparing method is simple, sources of raw materials are wide, and the carbon dot obtained with the method is stable in optical property and good inbiocompatibility, can be used for ratio-fluorescence continuous detection Pb2+ and PPi, and can also be used for paper sensing detection Pb2+ and PPi.

Description

technical field [0001] The invention relates to a fluorescent carbon point, in particular to a double-emission fluorescent carbon point and a preparation method thereof, and the application of the carbon point as a ratio fluorescence in detecting lead and pyrophosphoric acid. Background technique [0002] Lead (Pb 2+ ) As one of the most dangerous heavy metal ions, it can also cause serious physical damage to humans at extremely low concentrations, especially in children. It accumulates in the body by bonding with enzymes or sulfhydryl groups of proteins, causing damage to the brain, nerves and Cardiovascular damage is irreversible. Therefore, a convenient and quick method is very much needed. As one of the most important biological anions, pyrophosphate (PPi) plays an important role in the process of biological metabolism. It is not only the product of ATP hydrolysis in the organism, but also participates in the process of DNA replication. Therefore, identification of PP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64C01B32/15
Inventor 高艺芳张慧琳焦媛刘洋杨振华双少敏董川
Owner SHANXI UNIV
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