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Nitrogen-sulfur-doped efficient red light emission carbon dot, preparation method and application thereof

A carbon dot, high-efficiency technology, applied in chemical instruments and methods, nano optics, luminescent materials, etc., can solve the problems of complicated and expensive instruments, time-consuming experimental process, toxic reagents, etc. small effect

Active Publication Date: 2021-06-18
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some technologies for detecting Sn2+ have been adopted, these detection methods require complex and expensive instruments, the experimental process is time-consuming, and some reagents are toxic, so more convenient strategies still need to be explored

Method used

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  • Nitrogen-sulfur-doped efficient red light emission carbon dot, preparation method and application thereof
  • Nitrogen-sulfur-doped efficient red light emission carbon dot, preparation method and application thereof
  • Nitrogen-sulfur-doped efficient red light emission carbon dot, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0033] Dissolve 0.054g of o-phenylenediamine and 0.38g of ammonium thiocyanate in 5mL of ultrapure water at a molar ratio of 1:10, and stir for 20min at room temperature in a nitrogen atmosphere to form a uniform mixed solution. Move the mixed solution to a high-pressure reactor, and place it in an oven at 150°C for 12 hours; after the reaction, cool down to room temperature to take out the original solution of carbon dots, and remove the original solution by centrifuging at a constant temperature of 8000rpm at 25°C for 25min. A lump precipitated and a dark red supernatant was obtained. Take the centrifuged solution above and use a dialysis bag with a molecular weight cut-off of 100DA to remove small molecular impurities to obtain a relatively pure carbon dot solution; freeze-dry the dialyzed carbon dot solution for 20 hours to obtain solid carbon dot powder.

Embodiment 2

[0035]Take 0.054g of m-phenylenediamine and 0.19g of sodium thiocyanate dissolved in 5mL of ultrapure water, the molar ratio is 1:5, and stirred at room temperature and nitrogen atmosphere for 20min to form a uniform mixed solution. Move the mixed solution to a high-pressure reactor, and place it in an oven at 200°C for 12 hours; after the reaction, cool to room temperature to take out the original solution of carbon dots, and remove the original solution by centrifuging at a constant temperature of 8000rpm at 25°C for 25min. A lump precipitated and a dark red supernatant was obtained. Take the centrifuged solution above and use a dialysis bag with a molecular weight cut-off of 100DA to remove small molecular impurities to obtain a relatively pure carbon dot solution; freeze-dry the dialyzed carbon dot solution for 20 hours to obtain solid carbon dot powder.

Embodiment 3

[0037] Dissolve 0.054g of p-phenylenediamine and 0.38g of ammonium thiocyanate in 5mL of ultrapure water with a molar ratio of 1:10, and stir at room temperature for 20min in a nitrogen atmosphere to form a uniform mixed solution. Move the mixed solution to a high-pressure reactor, and place it in an oven at 200°C for 12 hours; after the reaction, cool to room temperature to take out the original solution of carbon dots, and remove the original solution by centrifuging at a constant temperature of 8000rpm at 25°C for 25min. A lump precipitated and a dark red supernatant was obtained. Take the centrifuged solution above and use a dialysis bag with a molecular weight cut-off of 100DA to remove small molecular impurities to obtain a relatively pure carbon dot solution; freeze-dry the dialyzed carbon dot solution for 20 hours to obtain solid carbon dot powder.

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Abstract

The invention discloses a nitrogen-sulfur-doped efficient red light emission carbon dot, a preparation method and application thereof. The preparation method comprises the following steps: (1) by taking phenylenediamine as a carbon source and a nitrogen source and thiocyanic acid and a derivative thereof as a sulfur source, dissolving the phenylenediamine and the sulfur source in a water solution according to a certain proportion; (2) transferring the mixed solution into a high-pressure reaction kettle, putting the high-pressure reaction kettle into a drying oven, preserving heat for 6-18 hours at 120-220 DEG C, and carrying out hydrothermal reaction treatment; and (3) cooling to room temperature, centrifuging the original solution of the carbon dots, dialyzing and purifying to obtain the carbon dots. According to the invention, the synthesis route is simple, the raw materials are wide in source and low in price, purification is easy, and the obtained red light carbon dots have the characteristics of good biocompatibility, good water solubility, high stability, low toxicity and the like, have excellent tissue penetrability and have unique advantages in biological cell, in-vivo imaging and other related biomedical applications.

Description

technical field [0001] The invention relates to a preparation method and application of nitrogen-sulfur-doped carbon dots with high-efficiency red light emission. Background technique [0002] Photoluminescence (PL) nanomaterials have attracted extensive scientific attention for various uses and applications. Because semiconductor nano-quantum dots (quantum dots, QDs) can adjust the emission color simply by changing the size of nanocrystals, and its luminescence performance is superior to traditional organic dyes, researchers have focused on the research of semiconductor nano-quantum dots for many years. However, high-performance quantum dots usually contain toxic heavy metal elements, and their applications in the medical field have attracted widespread attention. Therefore, finding alternative photoluminescent nanomaterials with lower toxicity has become a topic of increasing interest. In this regard, photoluminescent (PL) carbon dots (CDs), including graphene quantum do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCC09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/643G01N2021/6432
Inventor 朱志军朱培元唐建国劳伦斯·巴菲奥王瑶徐亚男沈文飞
Owner QINGDAO UNIV
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