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Nitrogen-sulfur co-doped carbon quantum dots as well as preparation method and application thereof

A carbon quantum dot and co-doping technology, applied in the field of carbon quantum dots and anion detection, can solve problems such as occupation, and achieve the effects of simple preparation steps, improved selectivity and sensitivity, and accurate characterization

Active Publication Date: 2019-05-31
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, surface functionalization using polymers or small organic molecules has the disadvantage of occupying functionalization-specific analytical sites.

Method used

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  • Nitrogen-sulfur co-doped carbon quantum dots as well as preparation method and application thereof
  • Nitrogen-sulfur co-doped carbon quantum dots as well as preparation method and application thereof
  • Nitrogen-sulfur co-doped carbon quantum dots as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1, place acid fuchsin and citric acid in the lining of polytetrafluoroethylene hydrothermal reaction kettle, add deionized aqueous solution, fully stir, the mass ratio of acid fuchsin, citric acid, and deionized water is 0.008:3: 30;

[0037] Step 2, put the liner containing the raw materials into the reaction kettle, and then place it in an oven and heat it to 180°C for 12 hours to obtain an orange-yellow liquid;

[0038] Step 3, take out the lining after the reaction kettle is naturally cooled to room temperature, pour the solution into a 500-1000Da dialysis bag for dialysis treatment for 1 day, and change the water every 6 hours to obtain a pure aqueous solution of carbon quantum dots;

[0039] In step 4, the carbon quantum dot aqueous solution obtained above is freeze-dried to obtain the target carbon quantum dot N,S-CDs.

Embodiment 2

[0041]The N,S-CDs prepared in Example 1 were characterized by transmission electron microscopy (TEM), infrared spectroscopy (FTIR) and XPS (see Figure 1-3 ), the particle diameters of the N,S-CDs prepared by the present invention are all less than 10nm, and the surface contains groups such as mercapto, carboxyl, hydroxyl, and amino groups. Dissolve 0.025g of N,S-CDs obtained in Example 1 in 100ml of secondary water, stir well to form 0.25×10 -3 g / ml clear solution. Afterwards, UV absorption spectroscopy and fluorescence excitation emission characterization were carried out (see Figure 4 ). It was found that there is a weak absorption at 450 nm and an emission wavelength of 552 nm under excitation at 375 nm. Then, using rhodamine 6G as a reference and ethanol as a solvent, the relative quantum yield of the carbon dots obtained in step 1 was measured to be 15%. In addition, through measurement, it can be known that the lifetime of the carbon dot is 5.27ns.

Embodiment 3

[0043] Take the 0.25×10 in Example 1 -3 2.5 mL of carbon dot solution at g / ml is placed in a fluorescent cuvette, and 0.02 mL (0.1 mol / L) of 19 common ion solutions are added respectively, mixed evenly, and the emission spectrum is scanned in a fluorescence photometer (λex=378nm, λem=552nm / 470nm), and record the fluorescence intensity, such as Figure 5 Shown, N,S-CDs to ClO - Good ion selectivity, ClO - It can quench the fluorescence of carbon quantum dots at 552nm (see Image 6 ). Further studies found that the synthesized carbon dots are relatively - It has high sensitivity, has a good linear relationship in the range of 1.6-96μmol / L, and the detection limit is 56nmol (see Image 6 illustration in ).

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Abstract

The invention provides nitrogen-sulfur co-doped carbon quantum dots as well as a preparation method and an application thereof.The preparation method comprises the following steps of:1) placing acid fuchsin and citric acid into a polytetrafluoroethylene hydrothermal reaction kettle liner, adding deionized water solution, and fully stirring;2) placing the liner filled with raw materials into a reaction kettle, and then placing the liner into an oven to heat to 175-185 DEG C to react for 8-12 hours to obtain orange-yellow liquid; 3) taking out the liner after the reaction kettle is naturally cooled to room temperature, pouring solution into a 500-1000Da dialysis bag to dialyze to obtain pure aqueous solution of carbon quantum dots, and freeze-drying to obtain the target carbon quantum dots.The preparation steps of the carbon quantum dots are simple, only one-step synthesis is needed, and the treatment of a surface passivator is not needed.The prepared carbon quantum dots can be used fordetecting ClO-ion, and also can be applied to cell fluorescence imaging.

Description

technical field [0001] The invention relates to the detection of carbon quantum dots and anions, in particular to the detection of nitrogen and sulfur co-doped carbon quantum dots and hypochlorite ions, and in particular to a nitrogen and sulfur doped bright yellow fluorescent carbon quantum dot and its preparation method , and the application of the carbon quantum dots in the detection of hypochlorite ions. Background technique [0002] Hypochlorite (ClO - ) has been widely used as a strong oxidizing agent and disinfectant in our daily life, such as water disinfection, food surface blanching, and many other manufacturing processes closely related to the food chain. At the same time, a large amount of ClO - Many undesirable by-products may be produced, especially trihalomethanes (THMs), which are harmful to humans and animals and can cause diseases such as reproductive disorders, kidney diseases, and atherosclerosis. In addition, HOCl / ClO - One of the key biological reac...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y30/00G01N21/64
Inventor 张慧林高艺芳焦媛刘洋双少敏董川
Owner SHANXI UNIV
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