Borophene nanosheet and preparation method thereof

A technology of nanosheets and boronene, which is applied in the field of boronene nanosheets and its preparation, can solve the problems that the product concentration is only a few milligrams per milliliter, the output of large-scale preparation has not been reached, and the process of boronene nanosheets is difficult. Ease of industrial scale-up production, easy batch preparation, and broad market prospects

Pending Publication Date: 2021-05-07
JIANGSU XFNANO MATERIALS TECH CO LTD
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Problems solved by technology

It is also because the special structure of boron is different from the existing two-dimensional materials, so it is more difficult to prepare boron nanosheets by the low-cost and large-volume liquid phase exfoliation method
At present, individual research groups have used liquid phase exfoliation to prepare boronene nanosheets. For example, Sun et al. used different organic solvents (Chem. Commun., 2019, 55, 4246-4249; ACSCatal. ) Ultrasonic stripping of boron powder to obtain boron nanosheets, but the efficiency of stripping is very low, and the final product concentration is only a few milligrams per milliliter, which is far from reaching the output of large-scale preparation

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  • Borophene nanosheet and preparation method thereof

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preparation example Construction

[0036] The preparation method of the boron nanosheets comprises the following steps:

[0037] The first is through liquid phase intercalation. In the present invention, the liquid phase intercalation is completed in two steps. First, the surface of the boron powder is infiltrated into the interlayer through a solvent similar to the surface energy of the boron powder. The second step is to use concentrated acid for intercalation. Different from the previous liquid-phase exfoliation, the present invention uses a two-step intercalation method. In the first step, a solvent with good wettability with boron powder is used to open the edge of the layer, and in the second step, the interlayer gap is further expanded by acid intercalation. The two-step intercalation method solves the problem that the interlayer spacing of the solvent with good wettability is small and the solvent molecules are easy to come out, and at the same time avoids the defect that the surface of the boron powder ...

Embodiment 1

[0046] A preparation method of boron nanosheets, the steps are as follows:

[0047] The first step is to add a certain amount of boron powder into the ethanol / DMP mixed solvent to prepare a dispersion liquid, and then use a 500W power ultrasonic instrument to carry out ultrasonication in a water bath, keeping the temperature not exceeding 30°C to obtain an ultrasonic mixture;

[0048] In the second step, the product obtained by filtering the ultrasonic mixture is added to concentrated acid to form a concentrated acid suspension, and then ultrasonicated in a 500W ultrasonic instrument, and then centrifuged and dried to obtain the intercalation product;

[0049] In the third step, the intercalation product is expanded by temperature programming to obtain expanded boron powder;

[0050] In the fourth step, the expanded boron powder is subjected to liquid phase exfoliation to obtain boronene nanosheets. The specific process parameters are shown in Table 1.

[0051] Characterizat...

Embodiment 2

[0053] A preparation method of boron nanosheets, the steps are as follows:

[0054] The first step is to add a certain amount of boron powder into the mixed solvent of isopropanol / DMF to prepare a dispersion liquid, and then use a 500W power ultrasonic instrument to carry out ultrasonication in a water bath, keeping the temperature not exceeding 30°C to obtain an ultrasonic mixture;

[0055] In the second step, the product obtained by filtering the ultrasonic mixture is added to concentrated acid to form a concentrated acid suspension, and then ultrasonicated in a 500W ultrasonic instrument, and then centrifuged and dried to obtain the intercalation product;

[0056] In the third step, the intercalation product is expanded by temperature programming to obtain expanded boron powder;

[0057] In the fourth step, the expanded boron powder is subjected to liquid phase exfoliation to obtain boronene nanosheets. The specific process parameters are shown in Table 1.

[0058] Charac...

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Abstract

The invention discloses a borophene nanosheet and a preparation method thereof, and mainly solves the problem of preparing a two-dimensional borophene nanosheet from boron powder at present. The borophene nanosheet has a typical two-dimensional layered structure, the thickness of the borophene nanosheet ranges from 0.3 nm to 10 [mu]m, the transverse size of the borophene nanosheet ranges from 100 nm to 100 [mu]m, and the mass content of boron is larger than 90%. The preparation method comprises the following steps: providing boron powder, adding the boron powder into a solvent, carrying out ultrasonic treatment in a water bath, then adding the obtained product into concentrated acid, carrying out ultrasonic treatment, and carrying out centrifugal drying to obtain an intercalation product; performing high-temperature expansion on the intercalation product to obtain expanded boron powder; and finally, performing liquid-phase stripping on the expanded boron powder to obtain the borophene nanosheet. The invention provides a simple, green, efficient and low-cost method for preparing the borophene nanosheet, and large-scale production can also be realized.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a boron nanosheet and a preparation method thereof. Background technique [0002] Due to their excellent physical and chemical properties, two-dimensional materials have great application prospects in the fields of catalysis, energy, and electronic information. As a new member of the two-dimensional material family, boronene has ultra-high electrical conductivity (≈102Ω-1cm-1), ultra-high carrier mobility (≈102cm2 V-1 s-1), and good thermal stability. The physical and chemical properties such as sex make it attract much attention in the fields of information, biomedicine, energy and environment. At present, the preparation of two-dimensional boron is mainly based on chemical vapor deposition (Angew. , 350(6267):1513-1516), the method equipment is expensive, the energy consumption is huge, and the yield is low. In order to realize the large-scale application o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02B82Y40/00
CPCC01B35/023B82Y40/00
Inventor 蒋旭董大鹏顾振光季锐田瑞雪
Owner JIANGSU XFNANO MATERIALS TECH CO LTD
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