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A kind of ultra-thin mxenes two-dimensional material with adjustable surface functional groups and transition metal valence states and its preparation method

A technology of two-dimensional materials and transition metals, applied in the field of ultra-thin MXenes and its preparation, can solve the problems of danger, strong corrosion, and high toxicity of HF solution, and achieve the effect of increasing yield and simple and convenient process

Active Publication Date: 2020-09-25
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Third, the HF solution used in the experiment is highly toxic and corrosive, and has certain dangers in actual operation
Therefore, the traditional acid etching method for interlayer stripping has the above disadvantages

Method used

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  • A kind of ultra-thin mxenes two-dimensional material with adjustable surface functional groups and transition metal valence states and its preparation method
  • A kind of ultra-thin mxenes two-dimensional material with adjustable surface functional groups and transition metal valence states and its preparation method
  • A kind of ultra-thin mxenes two-dimensional material with adjustable surface functional groups and transition metal valence states and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Ti in the ultra-thin MXenes of this example 3 C 2 A preparation method for low-temperature and ultra-high-pressure physical exfoliation of materials, comprising the following steps:

[0025] (1) Using layered precursor Ti 3 AlC 2 etc. as raw materials, the particle diameter is below 100um. Ti 3 AlC 2 Ultrasonic dispersion in a solvent with a certain concentration, the solvent is tetramethylammonium hydroxide, which has reducing properties, and the concentration is 0.001mg / ml.

[0026] (2) One-step direct preparation of ultra-thin two-dimensional MXenes by low-temperature and ultra-high pressure physical exfoliation: Ti dispersed in tetramethylammonium hydroxide in step (1) 3 AlC 2 The solution is poured into the container of the low-temperature ultra-high pressure continuous flow crusher at a low speed. The process parameters of the continuous flow crusher are as follows, low-temperature circulating water bath: 4°C, ultra-high pressure condition: 200MPa; peeling ...

Embodiment 2

[0033] Two-dimensional ultra-thin SnSe with surface functional groups and transition metal valences that can be regulated synchronously in this example 2 (MoS 2 and WSe 2 etc.) the preparation method of physical peeling, comprises the following steps:

[0034] (1) Using layered bulk SnSe 2 As the raw material, the particle diameter is below 100um. Bulk SnSe 2 Ultrasonic dispersion in a solvent with a certain concentration, the solvent is water, which is neutral, and the concentration is 1mg / ml.

[0035] (2) Direct preparation of ultrathin two-dimensional SnSe by low temperature and ultrahigh pressure physical exfoliation method 2 Material: SnSe dispersed in water in step (1) 2 The solution is poured into the container of the low-temperature ultra-high pressure continuous flow crusher at a low speed. The process parameters of the continuous flow crusher are as follows, low-temperature circulating water bath: 1°C, ultra-high pressure condition: 50MPa; peeling times: 10 tim...

Embodiment 3

[0038] The preparation method of the two-dimensional ultra-thin metal Zn physical exfoliation in which the surface functional groups and the valence state of the transition metal can be regulated synchronously in this embodiment includes the following steps:

[0039] (1) Layered block Zn is used as raw material, and the particle diameter is below 100um. The layered graphite is ultrasonically dispersed in a solvent with a certain concentration. The solvent is sodium sulfite solution, which is reducing, and the concentration is 0.1mg / ml.

[0040] (2) Direct preparation of ultrathin two-dimensional Zn nanosheets by low temperature and ultrahigh pressure physical exfoliation method: Pour the layered block Zn solution dispersed in neutral water in step (1) into the container of low temperature and ultrahigh pressure continuous flow crusher at low speed , The process parameters of the continuous flow crusher are as follows, low-temperature circulating water bath: 3°C, ultra-high pre...

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Abstract

The invention discloses an ultrathin MXenes two-dimensional layered material with adjustable surface functional groups and transition metal valence state and a preparation method thereof. The ultrathin MXenes two-dimensional layered material comprises: a surface functional group adjustable ultrathin MXenes two-dimensional material, a transition metal valence state adjustable ultrathin MXenes two-dimensional material, and an ultrathin MXenes two-dimensional material with both adjustable surface functional groups and transition metal valence state. The ultrathin two-dimensional layered materialcomprises: MXenes, graphene, black phosphorus, silylene, an ultrathin metal, an ultrathin metal oxide, a layered transition metal sulfide, a layered transition metal selenide, a layered transition metal telluride, boron nitride and a layered hydroxide. Compared with the prior art, the method provided by the invention adopts physical stripping method to open metal bonds and strip layered materials,has no need for corrosive acid, realizes synchronous regulation of surface functional group variety and metal valence state, and has the advantages of simple equipment, convenient operation, facilitation of mass preparation of two-dimensional ultrathin materials, and the like, also the preparation cost is low, and the method is green, safe and non-toxic.

Description

technical field [0001] The invention relates to ultra-thin MXenes with adjustable surface functional groups and transition metal valence states and a preparation method thereof, in particular to a physical stripping method to open metal bonds to prepare ultra-thin MXenes two-dimensional layered materials. Background technique [0002] Compared with bulk metals, nanomaterials have characteristics such as larger specific surface area, specific crystal plane exposure, and special size effect, thus showing higher activity, so nanomaterials have made significant progress in most application fields. Among many nanomaterials, two-dimensional nanomaterials have attracted much attention in recent years because their thickness is reduced from a three-dimensional bulk phase to a single-layer or few-layer nanoscale, resulting in unique electronic structures and exposing more active sites. Two-dimensional materials such as ultra-thin metals, ultra-thin metal oxides, layered metal chalcog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/921C01B19/04B82Y40/00C01G39/02C01B32/19B22F9/04
CPCB22F9/04B82Y40/00C01B19/007C01B32/19C01B32/921C01B2204/04C01G39/02C01P2002/85C01P2004/03C01P2004/04C01P2004/20
Inventor 杨慧李岚
Owner TIANJIN UNIVERSITY OF TECHNOLOGY