Preparation method of graphene quantum dot dispersion

A technology of graphene quantum dots and dispersion liquid, which is applied in the direction of graphene, nano-carbon, etc., can solve the problems of cumbersome steps, troublesome operation, and the inability to realize the precise control of the shape and size of graphene quantum dots, and achieve strong fluorescence properties , low cost, simple and easy to achieve the effect of particle size

Inactive Publication Date: 2014-01-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The top-down method has relatively simple steps and high yield, but cannot achieve precise control of the shape and size ...

Method used

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  • Preparation method of graphene quantum dot dispersion
  • Preparation method of graphene quantum dot dispersion
  • Preparation method of graphene quantum dot dispersion

Examples

Experimental program
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Embodiment 1

[0030] In the present embodiment, the preparation steps of graphene quantum dot dispersion liquid are as follows:

[0031] Step 1, such as figure 1 As shown, cut a groove on the block of dry ice;

[0032] Step 2. Cut the magnesium strip into a small section about 8cm long, wind it into a circle, light it on the alcohol lamp and put it into the groove of dry ice quickly, as figure 2 As shown, another piece of dry ice is used to cover a part of the mouth of the groove, that is, there is a gap at the mouth of the groove. The heat generated during the combustion process provides high temperature conditions for the reaction of the metal magnesium and carbon dioxide, so that the metal reacts with carbon dioxide to form elemental carbon. with magnesium dioxide, and elemental carbon is deposited on the surface of magnesium dioxide;

[0033] Step 3, after the reaction is over, the reaction product in step 2 is pickled with 0.37% to 5% dilute hydrochloric acid, filtered, and washed w...

Embodiment 2

[0040] In the present embodiment, the preparation steps of graphene quantum dot dispersion liquid are as follows:

[0041] Step 1. Vacuumize the reaction system, then fill it with oxygen, cut the magnesium tape into small pieces about 8cm long, wind it into a circle, ignite it with a match and place it in the reaction system; at the same time, pass carbon dioxide gas into the reaction system , the heat generated by the combustion of magnesium strips provides high-temperature conditions for the reaction of metal magnesium and carbon dioxide, so that the metal and carbon dioxide react to generate elemental carbon and magnesium dioxide, and the elemental carbon is deposited on the surface of magnesium dioxide;

[0042] Step 2, after the reaction is over, the reaction product in step 1 is pickled with 0.37% to 5% dilute hydrochloric acid, filtered, and washed with deionized water for 3 to 6 times, and washed with alcohol for 1 to 3 times, and the obtained filtered The cake was vac...

Embodiment 3

[0049] In this example, the preparation method of the graphene quantum dot dispersion is basically the same as that of Example 1, except that the aluminum wire with a diameter of 1 mm is used instead of the magnesium strip.

[0050] The graphene quantum dot dispersion prepared in this embodiment is observed under a transmission electron microscope, and the particle size of the graphene quantum dots is small, below 5 nm, and the dispersion is uniform. The electron diffraction pattern of the graphene quantum dots shows that the quantum dots are continuous polycrystalline diffraction rings, and the (002) Bragg diffraction rings in the figure are weak and diffuse, while the (100) and (200) Bragg diffraction rings are more obvious , and the polycrystalline diffraction ring is relatively small, indicating that the reaction product is graphene quantum dots. The fluorescence spectrogram of the graphene quantum dots in the dispersion shows that when the excitation wavelength is 365nm, ...

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Abstract

The invention provides a preparation method of graphene quantum dot dispersion. A metallic simple substance is adopted by the method to carry out chemical reaction on gas carbon dioxide. The method comprises the following steps: firstly, burning a metal material; supplying a high-temperature condition for reaction of metal and the gas carbon dioxide by the heat generated in the combustion process, so that the metal reacts with the gas carbon dioxide to generate simple substance carbon and metal oxide; depositing the simple substance carbon on the surface of the metal oxide, and then carrying out acid pickling, centrifuging and dialysis treatment by adopting a pickling solution, so as to obtain the graphene quantum dot dispersion. An experiment confirms that the method is low in cost, simple and feasible; the graphene quantum dots in the dispersion prepared by the method are fine in grain size, even to disperse, and strong in fluorescent property. Therefore, the preparation method has good application in the aspects such as biological fluorescent labeling, biological cell imaging and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing a graphene quantum dot dispersion liquid. Background technique [0002] Graphene is composed of sp2 hybridized carbon atoms and has a periodic honeycomb lattice structure. It has only a single layer of atomic thickness and can be warped into a zero-dimensional fullerene (Fullerene) and wound into a one-dimensional carbon nanotube ( Carbon Nanotube) or stacked into three-dimensional graphite (Graphite). [0003] As the latest member of the graphene family, the zero-dimensional graphene quantum dots (Graphene Quantum Dots, GQDs) not only have the excellent properties of graphene, but also exhibit quantum confinement effects and boundary effects due to their size below 10nm. Effect, and lead to some new physical properties, so it has a wide range of applications in biological cell imaging, biomarkers, electrochemical sensors, nanoelectrodes a...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/184
Inventor 秦禄昌张娟田天尚彤彤
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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