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A kind of synthetic method of carbon dot

A synthesis method and technology of carbon dots, which are applied in chemical instruments and methods, nanocarbons, luminescent materials, etc., can solve the problems of limiting the application of carbon dots, high cost of carbon sources, complicated operation, etc., and achieve good fluorescence performance and photostability, The effect of low cost and simple synthesis method

Active Publication Date: 2019-02-12
ANHUI NORMAL UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation process of most CDs is complicated to operate, the cost of carbon source used is high, and chemical reagents or solutions such as acid or alkali are used in the preparation process, which is easy to cause environmental pollution.
[0004] In the previous research on the preparation of carbon dots by pyrolysis, carbon dots were formed by carbonization of high-temperature pyrolysis precursors. Although the fluorescence quantum yield of the prepared carbon dots was high, most of them were oil-soluble, which limited the carbon dots in the water phase. Applications
[0005] At present, the fluorescence quantum yields (Fluorescence quantum yields, QYs) of carbon dots prepared by certain synthetic methods are low

Method used

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  • A kind of synthetic method of carbon dot
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  • A kind of synthetic method of carbon dot

Examples

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Effect test

Embodiment 1

[0028] A synthetic method of carbon dots, comprising the following steps:

[0029] A. Grind soybeans to a particle size of 0.4-0.7cm; then, after drying at 50°C for 60 minutes, put them in a crucible and place them in a horse oven, and calcine them at 350°C for 80 minutes, and cool the ash after calcination to room temperature. Grind it into powder and pass through a 500-mesh sieve for screening. The fineness of the powder is 30 microns.

[0030] B. Take 0.5g of powder in a Erlenmeyer flask, add 50ml of double distilled water, mix and shake well, and put it into an 80W power ultrasonic instrument for 60min. After the ultrasonication is completed, centrifuge at a speed of 9000r / min for 30min in a high-speed centrifuge to obtain a supernatant;

[0031] C. Filter the supernatant with a filter membrane (0.22 μm), centrifuge the filtrate at a speed of 9000 r / min for 25 min, put the obtained centrifugate into a 3000 Da dialysis bag and dialyze for 4 hours to obtain CDs.

[0032] T...

Embodiment 2

[0034] Put the ground and dried soybeans into a crucible and place them in a horse oven, and calcinate them at 400°C, 350°C, and 300°C for 60min, 80min, and 100min respectively. Other experimental conditions are the same as in Example 1. The obtained CDs solution Place in a 100mL volumetric flask to constant volume, and measure the fluorescence emission intensity at the excitation wavelength of 340nm. The optimization results of CDs preparation conditions are as follows: Figure 2A , Figure 2B , Figure 2C and Figure 2D shown. From Figure 2A , Figure 2B , Figure 2C It can be seen that the fluorescence intensity of CDs increases first and then decreases with the increase of pyrolysis time. This is because the degree of carbonization of soybeans is higher with the increase of pyrolysis time, but if the pyrolysis time is too long, soybeans are completely converted into carbon, resulting in a decrease in fluorescence intensity. From Figure 2D It can be seen that the...

Embodiment 3

[0038] A synthetic method of carbon dots, comprising the following steps:

[0039] A. Grind soybeans to a particle size of 0.4-0.7cm; then, after drying at 50°C for 60 minutes, put them in a crucible and place them in a horse oven, and calcine them at 350°C for 80 minutes, and cool the ash after calcination to room temperature. Grind it into powder, and pass through a 400-mesh sieve to sieve, and the fineness of the powder is 38 microns.

[0040] B. Take 0.5g of the powder in a conical flask, add 40ml of double distilled water, mix and shake well, put it into an 80W power ultrasonic instrument for 56min. After the ultrasonication is completed, centrifuge at a speed of 8000r / min for 30min in a high-speed centrifuge to obtain a supernatant;

[0041] C. Filter the supernatant with a filter membrane (0.22 μm), put the filtrate in a centrifuge and centrifuge, put the obtained centrifugate into a 3000Da dialysis bag and dialyze for 4.5 hours to obtain CDs.

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Abstract

The invention provides a method for synthesizing carbon dots. The method comprises the following steps: A, calcining grinded and dried soybeans, cooling the calcined ash to room temperature, and grinding into powder; B, mixing the powder with secondary distilled water, and centrifuging after ultrasonic treatment, so as to obtain supernatant; C, filtering the supernatant with a filter membrane, and centrifuging and purifying filtrate to obtain the carbon dots. Compared with the prior art, the carbon dots synthesized with the method provided by the invention have good fluorescence performance and light stability, water is used as a only solvent in the preparation process, the soybeans are used as a carbon source, raw materials are cheap and easily available, and the synthesis method is simple, low in cost, green and free of pollution.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a synthesis method of carbon dots. Background technique [0002] Carbon dots are a new type of fluorescent carbon nanomaterials with a size of less than 10nm and dispersed spherical shape. Due to its excellent properties such as biocompatibility, non-toxicity, multicolor fluorescence, and fluorescence stability, as well as its good application prospects in the fields of biomarkers, bioimaging, drug carriers, and fluorescent probes, it has attracted more and more attention. the interest of more researchers. [0003] In recent years, with the rapid development of the economy, some researchers have carried out research on the preparation of carbon dots. There are many methods for the synthesis of carbon dots, which can generally be divided into two categories: top-down synthesis methods and bottom-up synthesis methods. resolve resolution. The former is made of carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C09K11/65B82Y40/00
CPCC01P2002/80C01P2004/32C01P2004/64C01P2006/60C09K11/65
Inventor 王丽珍汪晓安刘金水
Owner ANHUI NORMAL UNIV
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