Preparation method for carbon quantum dots stable in pH and strong in light emission

A carbon quantum dot and stable technology, applied in the field of carbon quantum dot preparation, can solve the problems of low fluorescence efficiency, uncontrollable microwave temperature, etc., and achieve the effects of high luminous intensity, no light blinking pH characteristics, and stable pH properties

Inactive Publication Date: 2016-01-06
DONGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has been reported that fluorescent carbon dots are prepared by microwave pyrolysis of various amino acids, but there are disadvantages such as uncontrollable microwave temperature (local hot spots) and low fluorescence efficiency.

Method used

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  • Preparation method for carbon quantum dots stable in pH and strong in light emission
  • Preparation method for carbon quantum dots stable in pH and strong in light emission
  • Preparation method for carbon quantum dots stable in pH and strong in light emission

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Put 2g of sodium glutamate sample (general monosodium glutamate) into a small crucible without grinding, with N 2 Under protection, the calcination temperature is 350°C, the calcination time is 30min, and the heating rate is 10°C / min, and the calcination, carbonization and doping process are carried out;

[0031] (2) Scrape off the calcined product from the crucible, grind it sufficiently, dissolve it in ethanol, vibrate ultrasonically for 20 minutes, filter it with medium-speed filter paper, and dry it at 60°C for later use;

[0032] (3) Dissolve the dry product in (2) with a small amount of required solution, and dialyze with a 3000Da-3500Da dialysis membrane for 12 hours, the dialyzed fluid will be a liquid product, and the solid product will be obtained after drying.

[0033] figure 1 It is the process flow diagram of the present embodiment; figure 2 The transmission electron microscope image of the inorganic non-metallic carbon particle quantum dot prepared...

Embodiment 2

[0035] (1) Put 2g of sodium glutamate sample (general monosodium glutamate) into a small crucible without grinding, the calcination temperature is 400°C, the heating rate is 10°C / min, with N 2 Under protection, the calcination time is 0.5h, 1h, 1.5h, 2h and 2.5h respectively, and the calcination carbonization and doping process are carried out;

[0036] (2) Scrape off the calcined product from the crucible, grind it sufficiently, dissolve it in water, oscillate ultrasonically for 20 minutes, filter it with medium-speed filter paper, and filter the filtrate again with a 0.22 μm water-based filter membrane.

[0037] Figure 5 For the preparation of inorganic non-metallic carbon particle quantum dots by pyrolysis, the calcination temperature is 400 ° C, with N 2 Under protection, the calcination time is 0.5h, 1h, 1.5h, 2h and 2.5h respectively ultraviolet absorption and fluorescence composite spectrum, it can be seen from the figure that under the same calcination temperature, t...

Embodiment 3

[0039] (1) Put 2g of sodium glutamate sample (general monosodium glutamate) into a small crucible without grinding, the calcination time is 30min, the heating rate is 10℃ / min, there is N 2 Under protection, the calcination temperature is 200°C, 300°C, 400°C and 500°C respectively, and the calcination carbonization and doping process are carried out;

[0040] (2) Scrape off the calcined product from the crucible, grind it sufficiently, dissolve it in water, oscillate ultrasonically for 20 minutes, filter it with medium-speed filter paper, and filter the filtrate again with a 0.22 μm water-based filter membrane.

[0041] Image 6 For the preparation of inorganic non-metallic carbon particle quantum dots by pyrolysis, the calcination time is 30min, with N 2 Under protection, the calcination temperature is 200 ℃, 300 ℃, 400 ℃ and 500 ℃ UV absorption and fluorescence composite spectrum. It can be seen from the figure that under the same calcination time, the product with the calci...

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Abstract

The invention relates to a preparation method for carbon quantum dots stable in pH and strong in light emission. The preparation method includes the steps of calcining sodium glutamate in the N2 atmosphere to obtain carbon dot powder, dissolving carbon dots, conducting ultrasonic oscillation, filtering and drying, and dissolving and dialyzing the dried product to obtain the carbon quantum dots. The preparation method is easy and convenient to operate, free of high-pressure environments and easily industrialized. The carbon quantum dots prepared through the method have the advantages of being stable in pH and light emission for the environment, high in quantum efficiency, free of light blinking phenomena, uniform in size, extremely high in stability, high in biocompatibility, and the like.

Description

technical field [0001] The invention belongs to the field of preparation methods of carbon quantum dots, and in particular relates to a preparation method of strongly luminescent carbon quantum dots with stable pH. Background technique [0002] In recent years, the luminescent performance of traditional fluorescent dyes and heavy metal quantum dots in biomarking and scientific research applications is often severely damaged under harsh environmental pH conditions, which limits the application range of these markers. Therefore, more and more studies have begun to focus on inorganic non-metallic carbon particle quantum dots. Compared with traditional biomarkers, carbon particle quantum dots can be used normally under large environmental pH fluctuations, and the fluorescence intensity and other optical properties will not be affected. Therefore, inorganic non-metallic carbon particle quantum dots are the most excellent materials for scientific research applications such as bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B31/02
Inventor 周兴平郑楠楠丁莎
Owner DONGHUA UNIV
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