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Preparation method of environment-friendly economic luminescent carbon quantum dot

A technology of carbon quantum dots and fluorescence, which is applied in the fields of nanomaterials and biomedical engineering, can solve the problems that limit the large-scale production and practical application of fluorescent carbon quantum dots, complex follow-up processing methods, expensive raw materials, etc., and achieve small steric hindrance, The effect of simple preparation process equipment and high optical performance

Inactive Publication Date: 2013-09-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, these methods often require large-scale equipment, relatively expensive raw materials and complicated subsequent processing methods, etc., which largely limit the large-scale production and practical application of fluorescent carbon quantum dots.

Method used

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  • Preparation method of environment-friendly economic luminescent carbon quantum dot
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  • Preparation method of environment-friendly economic luminescent carbon quantum dot

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: Weigh 1g bagasse and add to 20ml double distilled water. The reaction solution was put into a stainless steel reaction kettle lined with 50ml polytetrafluoroethylene, and heated in an electric oven at a constant temperature of 180°C for 1 hour to obtain a light yellow solution containing carbon quantum dots. After the solution is naturally cooled, filter with a medium-speed filter paper to remove insoluble black precipitates, centrifuge at 15,000g to remove large particles, collect the supernatant and inject it into a dialysis bag with a molecular cutoff of 1,000Da for dialysis, the dialysis time is 72h, and change it every 12h water. The dialyzed product was rotovaped to obtain a concentrated solution. The concentrated solution was freeze-dried at -50°C to powder form, and the yield was 0%.

Embodiment 2

[0035] Example 2: Weigh 1 g of bagasse and add it to 20 ml of 0.6 M aqueous sodium hydroxide solution. The reaction solution was put into a stainless steel reaction kettle lined with 50ml polytetrafluoroethylene, and heated in an electric oven at a constant temperature of 180°C for 1 hour to obtain a light yellow solution containing carbon quantum dots. After the solution is naturally cooled, filter with a medium-speed filter paper to remove insoluble black precipitates, centrifuge at 15,000g to remove large particles, collect the supernatant and inject it into a dialysis bag with a molecular cutoff of 1,000Da for dialysis, the dialysis time is 72h, and change it every 12h water. The dialyzed product was rotovaped to obtain a concentrated solution. The concentrated solution was freeze-dried to powder at -50°C to obtain carbon quantum dots with high fluorescence performance, with a yield of 2.17%.

Embodiment 3

[0036] Example 3: Weigh 1 g of bagasse and add it to 20 ml of 0.8 M sodium hydroxide aqueous solution. The reaction solution was put into a stainless steel reaction kettle lined with 50ml polytetrafluoroethylene, and heated in an electric oven at a constant temperature of 180°C for 2 hours to obtain a light yellow solution containing carbon quantum dots. After the solution is naturally cooled, filter with a medium-speed filter paper to remove insoluble black precipitates, centrifuge at 15,000g to remove large particles, collect the supernatant and inject it into a dialysis bag with a molecular cutoff of 1,000Da for dialysis, the dialysis time is 72h, and change it every 12h water. The dialyzed product was rotovaped to obtain a concentrated solution. The concentrated solution was freeze-dried to powder at -50°C to obtain carbon quantum dots with high fluorescence performance, with a yield of 3.24%.

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Abstract

The invention discloses a preparation method and application of an environment-friendly economic luminescent carbon quantum dot. The method disclosed by the invention mainly comprises the following steps of: with bagasse as a carbon source material, adding the bagasse into a mineralizer aqueous solution, and heating by using a hydro-thermal synthesis reaction kettle in a muffle furnace at the temperature of 180 DEG C for 4h; centrifuging a brownish black reaction liquid at a high speed, and then, collecting a supernatant for dialyzing; collecting the reaction liquid in a dialysis bag, cooling the reaction liquid, and then, transferring the reaction liquid into a freezer drier for freeze-drying to finally obtain a powdery carbon quantum dot. The preparation method disclosed by the invention has the characteristics of simplicity, convenience and rapidness in operation as well as simplicity in preparation process and equipment; and the environment-friendly economic luminescent carbon quantum dot is made of daily wastes as raw materials and is low in cost, environment-friendly and easy to popularize. The carbon quantum dot prepared by the invention has the excellent characteristics of favorable dispersibility, water solubility, fluorescent stability, biocompatibility and the like, and is successfully applied to living cell imaging and marking.

Description

technical field [0001] The invention relates to an environmentally friendly and economical carbon quantum dot prepared by a one-step method and its application in biomedical imaging, belonging to the fields of nanometer materials and biomedical engineering. Background technique [0002] Quantum dots (QDs), also known as semiconductor nanocrystals, refer to semiconductor nano-fluorescent particles with a diameter of 1-10 nm and composed of a small number of atoms. Therefore, the movement of its internal electrons in all directions is restricted, and the energy is quantized in three directions, and the quantum confinement effect is particularly significant. Since the absorption spectrum of quantum dots is broad and continuous, while the emission spectrum is narrow and symmetrical, the optical properties can be tunable by adjusting the composition and size of quantum dots. Such unique optical properties and easy surface functional modification make quantum dots widely used in ...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65B82Y30/00C01B32/15
Inventor 张苗苗杜凤移龚爱华邵启祥邵根宝彭琬昕金洁吴卫疆周洲袁婧
Owner JIANGSU UNIV
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