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A method of preparing single-layer hexagonal boron nitride large single crystal by wrapping foam material

A hexagonal boron nitride and boron nitride single crystal technology, applied in the field of materials, can solve the problems of high nucleation density, poor crystal quality, and difficulty, and achieve the effects of low pollution, increased single crystal size, and low cost

Active Publication Date: 2019-05-14
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong catalytic activity of the platinum sheet, the nucleation density of h-BN on the surface of the platinum sheet is very high, and the obtained single crystal size is only in the nanometer size, and the crystal quality is poor.
At present, there is no report on the preparation of large single crystal h-BN on platinum substrate, which is related to the high chemical stability of platinum compared with copper foil, which is not easy to be polished, so it is difficult to prepare on platinum with conventional technology. Large single crystal h-BN

Method used

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  • A method of preparing single-layer hexagonal boron nitride large single crystal by wrapping foam material
  • A method of preparing single-layer hexagonal boron nitride large single crystal by wrapping foam material
  • A method of preparing single-layer hexagonal boron nitride large single crystal by wrapping foam material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Cut copper foil, platinum sheet and nickel foam of appropriate size; among them, the pore size of nickel foam is 0.1mm;

[0044] PPI is 120; porosity is 98%;

[0045] 2. Clean copper foil and foamed nickel with ammonium persulfate, deionized water and alcohol in sequence;

[0046] 3. Ultrasonic cleaning of the platinum sheet with alcohol and acetone in turn;

[0047] 4. Wrap the cleaned copper foil into a box shape, and inside it such as figure 1 a, b Place the platinum sheet and the nickel foam, and the nickel foam and the platinum sheet are vertically stacked;

[0048] In addition, prepare a group of copper boxes without nickel foam as a control group;

[0049] 5. Use a quartz boat to hold 5 mg of ammonia borane as a growth material, and put it into two areas of the tube furnace together with the two sets of substrates prepared in step 4, wherein ammonia borane is placed in the source area, and the two The set of substrates is placed in the reaction zone;

[0...

Embodiment 2

[0058] Experimental procedure

[0059] 1. Cut and process copper foil and nickel foam as in embodiment 1; wherein, the aperture of nickel foam is 0.1mm;

[0060] PPI is 120; porosity is 98%;

[0061] 2. Put the cleaned copper foil directly as figure 1 a wrapped into a copper box-shaped package of nickel foam, but does not contain other growth substrates; in addition, a group of copper foils without foamed nickel were prepared as a control group;

[0062] 3. Use a quartz boat to hold 5 mg of ammonia borane as a growth material, and put it into two areas of the tube furnace together with the two sets of substrates prepared in step 2, wherein ammonia borane is placed in the source area, Two sets of substrates are placed in the reaction zone;

[0063] 4. Close the tube furnace system, turn on the mechanical pump, and after the system is vacuumed to 0.2Pa, feed 10 sccm of hydrogen (this flow rate of hydrogen is always fed during the whole preparation process). At this time, the ...

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Abstract

The invention discloses a method for preparing a single-layer hexagonal boron nitride large single crystal through coating a foam material. The method comprises wrapping the foam material with a wrapping material, communicating the wrapped foam material and a chemical vapor deposition system, and carrying out chemical vapor deposition through compounds containing boron and nitrogen as raw materials to obtain the single-layer hexagonal boron nitride large single crystal. The wrapping material is a metal. The method can realize simple, efficient and eco-friendly preparation of the hexagonal boron nitride large single crystal on the surface of a metal substrate and can produce the hexagonal boron nitride large single crystal on the surface of a platinum sheet.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for preparing a single-layer hexagonal boron nitride large single crystal by wrapping a foam material. Background technique [0002] Hexagonal boron nitride (h-BN), a new two-dimensional material with a similar atomic structure to graphene, has a lattice coefficient similar to that of graphene (the lattice mismatch rate is only 1.8%), and is an ultra-thin insulating material material (bandgap about 5.9eV). It has an atomically smooth surface and fewer surface dangling bonds, so when it is used as a substrate for other two-dimensional semiconductor materials such as graphene or molybdenum disulfide, it is more efficient than conventional SiO 2 / Si substrate can significantly enhance the carrier mobility of graphene or other 2D semiconductor materials. In addition, h-BN also has excellent properties such as high thermal conductivity, mechanical strength, chemical and thermal stabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/38C30B25/18
CPCC30B25/18C30B29/38
Inventor 陈珊珊应豪王乐
Owner RENMIN UNIVERSITY OF CHINA