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Method for preparing MXene quantum dot by etching with alkali liquor

A technology of quantum dots and lye, which is applied in the field of MXene quantum dots prepared by lye etching, can solve problems such as environmental and human hazards, and the performance of quantum dots is greatly affected, and achieves the advantages of increased concentration, easy control of reaction conditions, and low cost Effect

Active Publication Date: 2019-10-25
UNIV OF SCI & TECH BEIJING
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the fact that most of the existing etching methods use F-containing systems, which have a great impact on the performance of quantum dots and are harmful to the environment and the human body, the purpose of the present invention is to provide a method for preparing quantum dots directly from MAX. The method, the preparation process of the method is simple, environmentally friendly, low in cost, short in consumption time and suitable for large-scale production; and has been proved to be universal for MAX materials

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  • Method for preparing MXene quantum dot by etching with alkali liquor
  • Method for preparing MXene quantum dot by etching with alkali liquor
  • Method for preparing MXene quantum dot by etching with alkali liquor

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preparation example Construction

[0035] Such as Figure 1-2 Shown, according to the preparation method of MXene quantum dot of the present invention, described method step is as follows:

[0036] Step 101. Weigh 0.1g MAX phase, 0.56g KOH, measure 10ml water.

[0037] Step 102. Dissolve the weighed KOH in 10 mL of water, then directly add MAX to the alkaline solution, and place it at room temperature for 4 hours (or longer) while stirring.

[0038] Step 103. Centrifuge the turbid solution obtained in step 102 at 3500 rpm for 5 min, and then filter it with a filter with a pore size of 0.22 μm to obtain MXene quantum dots.

[0039] Step 104. The quantum dots prepared under the water solvent can be dialyzed in a 3500Da dialysis bag for 3-5 days, which can remove a large amount of alkaline solution and Al ions dissolved in water, that is, prepare MXene quantum dots;

[0040] Step 105. By replacing the ionized water with the organic solvent DMSO and mixing and stirring with the MAX phase at 90°C for 1 hour, high-...

Embodiment approach 1

[0043] Weigh 0.1g Ti 3 AlC 2 , 0.56g KOH, KOH was dissolved in 10mL deionized water (made into 1mol alkaline solution), the glass beaker was sealed with plastic wrap, placed at room temperature for 6h and assisted by magnetic stirring, and the resulting turbid solution was centrifuged at 3500rpm for 5min , take the supernatant, and filter it with a filter membrane with a pore size of 0.22 μm to obtain a light yellow clear solution. The obtained solution was dialyzed with a dialysis bag (3500Da) for 3 days to remove alkaline ions and metal ions in the solution to obtain Ti 3 C 2 quantum dots. (Replace KOH with other medium-strong alkali solutions, repeat the above steps to obtain the same light yellow clear solution.)

[0044] The prepared quantum dots were tested as follows:

[0045] Characterized by high-resolution transmission electron microscopy, from Figure 3-4 It can be seen from the high-resolution transmission electron microscope image that the prepared quantum d...

Embodiment approach 2

[0047] Weigh 0.2g Ti 3 AlC 2 , 0.56g KOH, dissolving KOH in 10ml of DMSO and heating to 90°C to make it dissolve (make a 1mol / L alkaline solution), seal the glass beaker with plastic wrap, place it at room temperature for 6h and assist with stirring, put After the obtained turbid solution was centrifuged at 3500 rpm for 5 min, the supernatant was taken to obtain a dark brown clear solution. (Replace DMSO with other organic solvents and repeat the above process to obtain a similar dark solution.) After centrifuging the prepared solution, go to the upper layer and put the homogeneous solution into a glass bottle. Use a laser pointer to find the Tyndall phenomenon, indicating that a uniform colloidal solution is formed. , see Figure 8 .

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Abstract

The invention relates to a method for preparing a MXene quantum dot by etching with an alkali liquor, belonging to the field of semiconductor materials. The method comprises the following steps: weighing a MAX phase, an alkaline compound and water for subsequent usage; dissolving the alkaline compound into the water so as to form an alkaline solution; adding the MAX phase into the alkaline solution, and placing an obtained solution under the condition of a room temperature so as to form a turbid solution; centrifuging the turbid solution obtained in the step 3, and carrying out vacuum filtering through a filter so as to obtain a MXene quantum dot containing alkaline solution; dialyzing the MXene quantum dot containing alkaline solution so as to remove alkaline ions and metal ions in the solution; and mixing an organic solvent with the MAX phase under stirring so as to prepare the MXene quantum dot. The method provided by the invention has the advantages of simple preparation process, environmental friendliness, low cost, less time consumption and applicability to large-scale production; meanwhile, the MXene quantum dot is proved to have universality to a MAX material.

Description

technical field [0001] The invention belongs to the field of semiconductor materials, and in particular relates to a method for preparing MXene quantum dots by alkaline solution etching, which is prepared by soaking in alkaline solution at normal temperature. Background technique [0002] With the discovery of graphene, ultrathin two-dimensional nanomaterials have been developed rapidly, especially two-dimensional transition metal carbides, nitrides and carbonitrides. The two-dimensional MXene material has good hydrophilicity because of its excellent electrical conductivity, and because a large number of -OH, -F, and oxygen-containing groups are connected to the sheet. Because of its perfect combination of conductivity and hydrophilicity, it is widely used in catalysis, energy storage, photoelectricity, biology and other fields. However, most of the traditional MXene quantum dot preparation methods are to cut the layered structure MXene into quantum dots by the precursor MX...

Claims

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Application Information

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IPC IPC(8): C01B32/921C01B32/914C01B21/076B82Y40/00
CPCB82Y40/00C01B21/076C01P2004/04C01B32/914C01B32/921
Inventor 李妍齐昭君王力锋王钊
Owner UNIV OF SCI & TECH BEIJING
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