Surface modification method of MXene material

A technology of surface modification and molten salt, which is applied in the field of surface modification of MXene materials, can solve problems such as limiting the diversity of MXene surface end groups, and achieve the effect of promoting functional applications and large-scale preparation, and the method is simple and efficient

Pending Publication Date: 2022-04-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional preparation methods limit the diversity of MXene surface end groups, so exploring new MXenes surface end group modification methods is one of the key issues in the development of MXenes materials.

Method used

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  • Surface modification method of MXene material
  • Surface modification method of MXene material
  • Surface modification method of MXene material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Precursor MAX phase Ta 2 AlC powder, ZnCl 2 Lewis acid molten salt, Sb powder, inorganic salt (such as NaCl, KCl) are ground and mixed in a molar ratio of 1:2:1:5 to obtain a mixture.

[0038] (2) Put the mixture into an alumina crucible, then put it into a high-temperature vacuum tube furnace to react at 600° C. under the protection of an inert atmosphere, and after the sintering temperature drops to room temperature, take out the reaction product in the alumina crucible.

[0039] (3) Product post-treatment: put the reaction product into a beaker, add deionized water, stir and ultrasonically clean the remaining salt in the reaction product, then perform suction filtration, and finally dry to obtain a powder product.

[0040] Use X-ray diffraction (XRD) to detect the powder and precursor MAX phase treated in step (3), such as figure 1 shown. Compared with the precursor MAX phase, Ta 2 The diffraction peak of CSb broadens or even disappears, while the characteris...

Embodiment 2

[0042] (1) Precursor MAX phase Ti 2 AlC powder, FeCl 2 Lewis acid molten salt, As 2 Cd 3 Powder, inorganic salts (such as NaCl, KCl) are ground and mixed in a molar ratio of 1:1.5:1:8 to obtain a mixture.

[0043] (2) Put the mixture into an alumina crucible, then put it into a high-temperature vacuum tube furnace to react at 700° C. under the protection of an inert atmosphere, and after the sintering temperature drops to room temperature, take out the reaction product in the alumina crucible.

[0044] (3) Product post-treatment: put the reaction product into a beaker, add deionized water, stir and ultrasonically clean the remaining salt in the reaction product, then perform suction filtration, and finally dry to obtain a powder product.

[0045] Image 6 is the As-containing MXene Ti at the end group in this example 2 XRD patterns of CAs. Compared with the precursor MAX phase, the characteristic peaks are weakened, indicating that the crystal structure has changed, but ...

Embodiment 3

[0047] (1) The precursor MAX phase Ti 3 AlC 2 Powder, CuBr 2 Lewis acid molten salt, P powder, inorganic salts (such as NaCl, KCl) are ground and mixed in a molar ratio of 1:2.5:1:10 to obtain a mixture.

[0048] (2) Put the mixture into an alumina crucible, then put it into a high-temperature vacuum tube furnace to react at 800° C. under the protection of an inert atmosphere, and after the sintering temperature drops to room temperature, take out the reaction product in the alumina crucible.

[0049] (3) Product post-treatment: put the reaction product into a beaker, add deionized water, stir and ultrasonically clean the remaining salt in the reaction product, then perform suction filtration, and finally dry to obtain a powder product containing end groups containing MXene material Ti of P and Br 3 C 2 (Br 0.66 P 0.33 ). Figure 9 Ti is the MXene material in this example 3 C 2 (Br 0.66 P 0.33 ), from which the layered structure due to the etching can be observed, i...

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Abstract

The invention belongs to the technical field of two-dimensional nano materials, and particularly relates to a surface modification method of an MXene material, in particular to an MXene surface modification method based on anion coordination competition in a molten salt environment. The preparation method specifically comprises the following steps: mixing a precursor MAX phase material, Lewis acid molten salt, end-group-related elemental element powder or an end-group-related alloy phase and inorganic salt, and carrying out high-temperature reaction to prepare the MXene material. The method disclosed by the invention is simple, efficient and environment-friendly, multiple defects caused by using a hydrofluoric acid solution with high toxicity and high risk as an etching agent to prepare MXene are avoided, meanwhile, chemical modification of the surface of the MXene material is realized, physical and chemical properties of the MXene material can be effectively regulated and controlled through end group modification, and functional application and large-scale preparation of MXene are expected to be further promoted.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional nanomaterials, and particularly relates to a surface modification method of MXene materials. Background technique [0002] In recent years, the emergence of MXene as a new type of two-dimensional material has attracted great attention of materials researchers. MXenes are transition metal nitrides or carbides with the general formula M n+1 X n T x (n=1-3), wherein M is generally a metal of the pre-transition group, genus, A is the main group element, X represents nitrogen or carbon, n=1~3, T x Indicates surface end groups. In general, MXenes can be obtained by etching the “A” site atoms in MAX using HF or HCl+LiF. The "A" atom usually refers to elements of the IIIA or IVA main group, such as Si and Al. During the etching process, the surface is terminated with different end groups such as -OH, -O and -F. The abundant end groups on the surface of MXene offer great possibilities for su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/914C01B32/921
Inventor 黄庆丁浩明李友兵
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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