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Preparation method of nitrogen and chlorine double-doped fluorescent carbon quantum dot

A technology of carbon quantum dots and double doping, which is applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, and luminescent materials. sexual effect

Active Publication Date: 2018-03-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wang Aijun et al. used nitrogen-phosphorus aminodicarboxylic acid and ethylenediamine as reactants to prepare nitrogen and phosphorus co-doped carbon quantum dots with a quantum yield of 17.5% by microwave reaction, and the prepared carbon quantum fluorescence quantum yield was low (Ai -Jun Wang et al,Microwave-assisted synthesis of N,P-doped carbon dots for fluorescent cell imaging[J].Microchimica Acta,2016,183(2):821-826.)

Method used

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  • Preparation method of nitrogen and chlorine double-doped fluorescent carbon quantum dot
  • Preparation method of nitrogen and chlorine double-doped fluorescent carbon quantum dot
  • Preparation method of nitrogen and chlorine double-doped fluorescent carbon quantum dot

Examples

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Embodiment 1

[0029] Step 1: Weigh 2.15g of glucosamine hydrochloride and dissolve it in 10mL of water, stir with a stirring bar for 15min to completely dissolve to obtain a clear and transparent solution.

[0030] Step 2: transfer the clear solution to a hydrothermal reaction kettle, react at 200° C. for 1 h, and cool the solution obtained after the reaction to room temperature to obtain a suspension.

[0031] Step 3: Filter the suspension using a polytetrafluoroethylene filter membrane. Then centrifuge at 6000r / min for 15min to obtain a brown solution.

[0032] Step 4: The brown solution was further dialyzed with a 220nm 1000Da dialysis bag, and dialyzed for two days to obtain a nitrogen and chlorine double-doped carbon quantum dot solution.

[0033] Step 5: freeze-dry the nitrogen and chlorine double-doped carbon quantum dot solution in a lyophilizer to obtain a nitrogen and chlorine double-doped carbon quantum dot solid, and its relative quantum yield (based on quinine sulfate) is 16.9...

Embodiment 2

[0036] Step 1: Weigh 2.15g of glucosamine hydrochloride and dissolve it in 10mL of water, and stir it with a stirring bar for 20min to completely dissolve it to obtain a clear and transparent solution.

[0037] Step 2: Transfer the clear solution to a hydrothermal reaction kettle, react at 200° C. for 2 hours, and cool the solution obtained after the reaction to room temperature to obtain a suspension.

[0038] Step 3: Filter the suspension using a 220 nm polytetrafluoroethylene filter membrane. Then centrifuge at 6000r / min for 15min to obtain a brown solution.

[0039] Step 4: The brown solution was further dialyzed with a dialysis bag with a molecular weight cut-off of 1000 Da, and dialyzed for two days to obtain a nitrogen and chlorine double-doped carbon quantum dot solution.

[0040] Step 5: freeze-dry the nitrogen and chlorine double-doped carbon quantum dot solution in a lyophilizer to obtain a nitrogen and chlorine double-doped carbon quantum dot solid, and its relati...

Embodiment 3

[0042] Step 1: Weigh 2.15g of glucosamine hydrochloride and dissolve it in 10mL of water, and stir it with a stirring bar for 25min to completely dissolve it to obtain a clear and transparent solution.

[0043] Step 2: Transfer the clear solution to a hydrothermal reaction kettle, react at 200° C. for 3 h, and cool the solution obtained after the reaction to room temperature to obtain a suspension.

[0044]Step 3: Filter the suspension using a 220 nm polytetrafluoroethylene filter membrane. Then centrifuge at 6000r / min for 15min to obtain a brown solution.

[0045] Step 4: The brown solution was further dialyzed with a dialysis bag with a molecular weight cut-off of 1000 Da, and dialyzed for two days to obtain a nitrogen and chlorine double-doped carbon quantum dot solution.

[0046] Step 5: freeze-dry the nitrogen and chlorine double-doped carbon quantum dot solution in a lyophilizer to obtain a nitrogen and chlorine double-doped carbon quantum dot solid, and its relative qu...

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Abstract

The invention discloses a preparation method of a nitrogen and chlorine double-doped fluorescent carbon quantum dot. The preparation method comprises the steps of with amino sugar hydrochloride or amino acid hydrochloride as raw materials, simultaneously supplying a carbon source, a nitrogen source and a chlorine source, dissolving the raw material into ultrapure water, stirring so as to obtain asettled solution, carrying out hydrothermal reaction, cooling a synthesized product, filtering, and carrying out centrifugation and dialysis, so as to obtain the water-soluble nitrogen and chlorine double-doped fluorescent carbon quantum dot. By utilizing a one-step reaction, the required raw material is few, byproducts are few, and the method has the characteristics of high efficiency, economy and the like. The carbon quantum dot prepared by virtue of the carbon quantum dot has stable fluorescent property and low toxin, can be applied to the detection of Fe<3+> and simultaneously has wide application prospect in the aspects of fluorescent ink, sewage treatment and the like.

Description

technical field [0001] The invention belongs to the field of inorganic material chemistry, and relates to a method for preparing fluorescent carbon quantum dots double-doped with nitrogen and chlorine, in particular to a kind of nitrogen, amino acid hydrochloride or amino acid hydrochloride as the only raw material source. A method for preparing fluorescent carbon quantum dots doped with chlorine. Background technique [0002] As a quasi-zero-dimensional nanomaterial composed of a small number of atoms, quantum dots have a size between 1 and 100nm and have superior properties such as quantum confinement effects, size effects, and surface effects, and can be used as new fluorescent nanomaterials. In optics, cell biology, biochemistry and molecular biology. Semiconductor quantum dots have the advantages of strong single-particle fluorescence, adjustable fluorescence wavelength, and resistance to photobleaching. However, heavy metal elements are often contained in semiconduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/65G01N21/643
Inventor 董伟陈琦李军舰盛伟仲银左淦丞
Owner NANJING UNIV OF SCI & TECH
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