Preparation method of nitrogen- and sulfur-doped fluorescence carbon dots

A technology of fluorescent carbon dots and nitrogen doping, which is applied in the field of nanomaterials, can solve the problems of cumbersome reaction process, harsh reaction conditions and high cost of raw materials, and achieves the effects of good water solubility, good optical performance and simple preparation method.

Inactive Publication Date: 2016-05-04
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although many preparation methods of carbon dots have been developed at present, these methods often have disadvantages

Method used

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  • Preparation method of nitrogen- and sulfur-doped fluorescence carbon dots

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Embodiment approach 1

[0017] The pomelo was crushed into a slurry with a wall breaker (45000r / min, 10min), and centrifuged (8000r / min, 10min) to get the supernatant. Take 10mL of supernatant and add 1.2g of ammonium sulfate into the reaction kettle and react at 160°C for 6h. The reaction solution was first centrifuged (10000r / min, 20min) to remove large solid particles and then filtered with a 0.22μm membrane filter. The resulting solution was dialyzed for 48 hours with a dialysis bag with a molecular weight cut-off of 3500 Da to finally obtain a carbon dot solution.

Embodiment approach 2

[0019] The pomelo was crushed into a slurry with a wall breaker (45000r / min, 10min), and centrifuged (8000r / min, 10min) to get the supernatant. Take 10mL of supernatant and add 1.6g of ammonium persulfate into the reaction kettle and react at 180°C for 18h. The reaction solution was first centrifuged (10000r / min, 20min) to remove large solid particles and then filtered with a 0.22μm membrane filter. The resulting solution was dialyzed for 48 hours with a dialysis bag with a molecular weight cut-off of 3500 Da to finally obtain a carbon dot solution.

Embodiment approach 3

[0021] The pomelo was crushed into a slurry with a wall breaker (45000r / min, 10min), and centrifuged (8000r / min, 10min) to get the supernatant. Take 10 mL of the supernatant and add 1.6 g of thioacetamide ammonium into the reaction kettle and react at 160° C. for 24 h. The reaction solution was first centrifuged (10000r / min, 20min) to remove large solid particles and then filtered with a 0.22μm membrane filter. The resulting solution was dialyzed for 48 hours with a dialysis bag with a molecular weight cut-off of 3500 Da to finally obtain a carbon dot solution.

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Abstract

The invention discloses a preparation method of nitrogen- and sulfur-doped fluorescence carbon dots. The fluorescence carbon dots are prepared by a hydrothermal method adopting grapefruit juice as a precursor and an N- and S-containing compound as a passivator. The method comprises the following steps: adding the grapefruit juice together with ammonium sulfate, ammonium persulfate, thioacetamide and ammonium sulfide respectively into a reaction kettle and heating for several hours; and centrifuging the reaction liquid, filtering with a filtering membrane and dialyzing to obtain an aqueous solution of carbon dots. According to the preparation method disclosed by the invention, the adopted grapefruit juice comes from natural resources and is easily available; and the doped nitrogen and sulfur are good for enhancing the fluorescence property. The method has the advantages of simple preparation process and controllable conditions and is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a method for preparing carbon dots by using grapefruit extract as a carbon source and adopting a hydrothermal method. Background technique [0002] Carbon dots are a new class of carbon nanomaterials developed in recent years. Since Xu et al first used electrophoresis to separate and purify carbon dots from single-walled carbon nanotubes in 2004, the research on carbon dots has received more and more attention. The particle size of carbon dots is usually less than 10nm, and has excellent optical properties such as high fluorescence intensity, good photostability, and resistance to photobleaching. Since carbon dots are mainly composed of carbon elements and do not contain metal elements, and their surface contains water-soluble functional groups such as hydroxyl and carboxyl groups, carbon dots have low toxicity and good water solubility, so that carbon dots have ideal ...

Claims

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Application Information

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IPC IPC(8): C09K11/65
CPCC09K11/65
Inventor 沈洁商少明陈秀英顾丹高海燕许虎君马天娇
Owner JIANGNAN UNIV
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