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Polymer-assisted method for preparing two-dimensional materials and their composite materials

A technology of two-dimensional materials and composite materials, which is applied in the field of polymer-assisted preparation of two-dimensional materials and their composite materials. , the effect of convenient operation

Active Publication Date: 2022-02-11
TSINGHUA BERKELEY SHENZHEN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the abrasive particles described in the patent are hard inorganic particles, and the force exerted by the abrasive particles on the layered material not only causes the layered material to be peeled off, but also breaks the two-dimensional material sheet obtained by peeling off. thereby limiting the size of the film

Method used

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  • Polymer-assisted method for preparing two-dimensional materials and their composite materials
  • Polymer-assisted method for preparing two-dimensional materials and their composite materials
  • Polymer-assisted method for preparing two-dimensional materials and their composite materials

Examples

Experimental program
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Effect test

Embodiment 1

[0051] This embodiment provides a polymer-assisted method for preparing two-dimensional materials. In this embodiment, the two-dimensional material is two-dimensional boron nitride. The specific steps are as follows:

[0052] S1. Add 1.0 g of layered boron nitride powder (boron nitride powder from Tianyuan New Material Company, H-BN-F) and 20.0 g of polyethyleneimine solution (Sigma- Aldrich company, average Mn ~ 60,000by GPC, average Mw ~ 750,000by LS, water as solvent, accounting for 50% by mass), manual pre-stirring. Start the mortar grinder and adjust the force of the grinding pestle (~150N / cm 2 ), grinding for 8h. After grinding, add 100 mL of deionized water into the mortar and stir evenly to obtain a two-dimensional boron nitride / polyethyleneimine mixed dispersion.

[0053] S2. Stand still, take the supernatant, centrifuge at 10,000 r / min for 1 hour, and centrifuge 5 times to remove residual polyethyleneimine to obtain a two-dimensional boron nitride dispersion.

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Embodiment 2

[0057] This embodiment provides a two-dimensional boron nitride. The preparation process is the same as that in Embodiment 1, except that the centrifugation speed in step S2 is 3000 r / min, and the centrifugation time is 15 minutes.

[0058] Take the two-dimensional boron nitride dispersion prepared in this example, and use a dynamic light scattering instrument to measure its sheet diameter distribution curve. The results are as follows: image 3 As shown, it can be seen from this figure that in the supernatant after centrifugation, the average sheet diameter of two-dimensional boron nitride is 653.5nm.

Embodiment 3

[0060] This example provides six kinds of two-dimensional boron nitride dispersions. The preparation process is the same as in Example 1, except that the layered boron nitride used is boron nitride powder from Qinhuangdao Yinuo High-tech Material Development Co., Ltd. (BNH30, referred to as Qinhuangdao Yinuo), boron nitride powder (PT110, referred to as American Momentive) of American Momentive Company, cosmetic grade boron nitride (UNI-BN 2831, referred to as United Micropowder) of United Micro Powder Company, Forsman Boron nitride powder (325 mesh, referred to as Fussman) of Science and Technology (Beijing) Co., Ltd., boron nitride powder (H-BN-F, referred to as Tianyuan New Material) of Tianyuan New Material Company, Dandong Chemical Research Institute Co., Ltd. The company's boron nitride powder (HSL, referred to as Dandong Chemical).

[0061] Get six kinds of layered boron nitride used in this embodiment, its scanning electron microscope picture is as follows Figure 4 A...

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Abstract

The invention discloses a method for polymer-assisted preparation of two-dimensional materials and their composite materials. The method for preparing two-dimensional materials includes the following steps: S1, mixing polymer solutions with layered materials and grinding to obtain two-dimensional materials / A polymer composite material, the viscosity of the polymer solution is 500-500000mPa·s, and the polymer solution includes a polymer and a solvent; S2, filtering out the polymer in the two-dimensional material / polymer composite material to obtain 2D materials. The method provided by the embodiment of the present invention can realize the large-scale controllable preparation of high-quality two-dimensional materials, the operation is convenient, the process flow is simple and fast, and it is suitable for industrial production. The prepared two-dimensional materials have the advantages of large sheet diameter and thin thickness , to achieve high quality standards while ensuring high yields.

Description

technical field [0001] The invention relates to the technical field of two-dimensional material preparation, in particular to a polymer-assisted method for preparing two-dimensional materials and their composite materials. Background technique [0002] With the development of science and technology, a variety of emerging technologies such as wearable electronic devices, convenient medical diagnosis, and artificial intelligence have emerged in recent years. The emergence and application of these emerging technologies have also put forward higher requirements for the performance of related materials. Graphene, due to its excellent structural and electrical properties, flexibility, large specific surface area, and high carrier mobility, has broad application prospects in the fields of electronic devices, energy storage, biomedicine, and catalysis, opening up two-dimensional A new era in materials research. In addition to graphene, two-dimensional materials also include transit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064C01B17/20C01B32/19C01G39/06C01G41/00C08L75/04C08K7/24C08J5/18
CPCC01B21/0648C01B17/20C01G39/06C01G41/00C01B32/19C08J5/18C01P2004/20C01P2004/62C01P2004/61C01P2004/64C01P2004/04C01P2004/03C08J2375/04C08K7/24
Inventor 刘碧录杨柳思谭隽阳张弛成会明
Owner TSINGHUA BERKELEY SHENZHEN INST