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Fluorescence amino carbon quantum dots, and preparation method and application thereof

An amino carbon quantum and fluorescence technology, which is applied in the fields of optics, polymers and biomass chemical industry, can solve the problems of time-consuming and expensive, and achieve the effect of improving quantum efficiency, simple preparation process and improving fluorescence properties.

Active Publication Date: 2014-08-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of amino carbon quantum dot, adopt xylan as carbon precursor, ammoniacal liquor is as dispersant and passivation agent, utilize the simulation biomineralization under hydrothermal condition, carry out carbonization to xylan molecule, and At the same time, an effective surface passivation was carried out, which effectively overcomes the time-consuming and expensive defects of the general preparation method, and obtains amino carbon quantum dots with nanoscale and strong blue fluorescence; moreover, through cytotoxicity and cell imaging experiments, effective The low cytotoxicity and good biocompatibility of the material were thoroughly tested

Method used

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  • Fluorescence amino carbon quantum dots, and preparation method and application thereof
  • Fluorescence amino carbon quantum dots, and preparation method and application thereof
  • Fluorescence amino carbon quantum dots, and preparation method and application thereof

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Embodiment 1

[0036] Weigh 1.000 g of purified xylan, add 19 ml of 2% ammonia solution (v / v), stir magnetically until completely dispersed, and the mixture becomes an khaki opaque suspension. The mixture was transferred into a 25ml polytetrafluoroethylene reactor with a stainless steel outer lining, sealed and placed in a muffle furnace, and hydrothermally treated (200°C) for 12h. After the reaction was over, the reactor was taken out and cooled to room temperature in air. The product is a dark brown liquid and gray-black precipitate with a strong ammonia smell. Move the product to a beaker, and ultrasonically disperse it in an ultrasonic cleaner with a power of 70W, time of 1h, and temperature at room temperature. Then, the product was refrigerated and centrifuged at 15000 rpm, 0° C. for 15 min, and repeated twice. A dark brown supernatant and a large amount of powdery precipitates are obtained. After removing the precipitates, an aqueous solution of amino carbon quantum dots is obtained...

Embodiment 2

[0046]Weigh 1.000 g of purified xylan, add 19 ml of 2% sodium hydroxide aqueous solution (w / v), stir magnetically until completely dispersed, and the mixture becomes an orange-yellow transparent solution. The mixture was transferred into a 25ml polytetrafluoroethylene reactor with a stainless steel outer lining, sealed and placed in a muffle furnace, and hydrothermally treated (200°C) for 12h. After the reaction was over, the reactor was taken out and cooled to room temperature in air. The product is a dark brown liquid and a small amount of gray-black precipitate. Move the product to a beaker, and ultrasonically disperse it in an ultrasonic cleaner with a power of 70W, time of 1h, and temperature at room temperature. Then, the product was refrigerated and centrifuged at 15000 rpm, 0° C. for 15 min, and repeated twice. A dark brown supernatant and a small amount of powdery precipitate were obtained, and after the precipitate was removed, an aqueous solution of ammonia-free c...

Embodiment 3

[0053] Weigh 1.000 g of purified xylan, add 19 ml of 25% ammonia solution (v / v), stir magnetically until completely dispersed, and the mixture becomes an khaki opaque suspension. The mixture was transferred into a 25ml polytetrafluoroethylene reactor with a stainless steel outer lining, sealed and placed in a muffle furnace, and hydrothermally treated (200°C) for 6h. After the reaction was over, the reactor was taken out and cooled to room temperature in air. The product is a dark brown liquid and gray-black precipitate with a strong ammonia smell. Move the product to a beaker, and ultrasonically disperse it in an ultrasonic cleaner with a power of 70W, time of 1h, and temperature at room temperature. Then, the product was refrigerated and centrifuged at 15000 rpm, 0° C. for 15 min, and repeated 3 times. A dark brown supernatant and a large amount of powdery precipitates are obtained. After removing the precipitates, an aqueous solution of amino carbon quantum dots is obtain...

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Abstract

The invention discloses fluorescence amino carbon quantum dots, and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing aqua ammonia with purified xylan, and stirring until the xylan is dispersed in the solution; (2) transferring the mixture into a reaction kettle, putting in a sealed muffle furnace, and carrying out hydrothermal treatment; (3) cooling the product to room temperature, and carrying out ultrasonic dispersion treatment; (4) carrying out refrigerated centrifugal separation on the treated product, removing the precipitate, and collecting the supernate to obtain a fluorescence amino carbon quantum dot water solution; and (5) concentrating the product water solution by rotary evaporation, and finally, carrying out vacuum drying to obtain the fluorescence amino carbon quantum dots. The amino carbon quantum dots have the advantages of high fluorescence, high stability, low cytotoxicity and favorable biocompatibility, and can be widely used in the fields of cell imaging, disease diagnosis, drug transfer and the like.

Description

technical field [0001] The invention relates to a method for preparing strong fluorescent amino carbon quantum dots by a one-step method from a xylan / ammonia water mixture and an application thereof, belonging to the fields of optics, macromolecule and biomass chemical industry. Background technique [0002] Carbon quantum dots are a new type of carbon material, which have broad application prospects in the fields of bioimaging, drug delivery, catalysis, sensing, and photoelectric conversion. In recent years, carbon quantum dots have become a hot spot in the research of luminescent materials because of their fluorescence, chemical inertness, water solubility and low toxicity. It effectively overcomes the harm to the environment caused by the use of heavy metals in traditional semiconductor quantum dots. However, most of the current methods for preparing carbon quantum dots require harsh conditions, lengthy processes, and require the use of amine-based terminal polymers (suc...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64
Inventor 王小慧梁梓承孙润仓
Owner SOUTH CHINA UNIV OF TECH
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