Preparation method of hexagonal boron nitride nanospheres with layered cavitation structure

Abstract

The invention relates to a preparation method of hexagonal boron nitride nanospheres with a layered cavitation structure. The method takes trimethyl borate as a raw material, and comprises the following two steps: step 1, carrying trimethyl borate into a reaction zone in a nitrogen bubbling manner, reacting trimethyl borate with ammonia gas at a high temperature, and preparing a solid boron nitride nanosphere precursor by a chemical vapor deposition method; and 2, respectively carrying out annealing treatment on the prepared boron nitride nanosphere precursor in different atmospheres such as hydrogen-argon mixed gas, nitrogen and hydrogen-nitrogen mixed gas at a high temperature to obtain the boron nitride nanospheres which can be controlled by subsequent treatment atmospheres and have different layered cavitation structures. The method is simple to operate, safe in experiment and capable of realizing large-batch synthesis, and controllability of the internal cavitation structure of the boron nitride nanosphere is realized.

Description

technical field [0001] The invention relates to a method for preparing hexagonal boron nitride nanospheres with a layered cavitation structure. Background technique [0002] Hexagonal boron nitride (h-BN), which has a layered structure similar to graphene, is usually white powder, commonly known as "white graphite". In the layer is an infinitely extended hexagonal network structure in which N atoms and B atoms are alternately arranged, and the layers are arranged alternately in the form of ABAB, which has high thermal stability, high thermal conductivity, electrical insulation properties, wave transparency, excellent lubrication performance and Excellent physical and chemical properties such as low dielectric constant have broad application prospects in composite materials, luminescent materials, electronic materials, etc. [0003] In recent years, boron nitride nanospheres have attracted widespread attention due to their isotropic properties. Existing studies have shown t...

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Problems solved by technology

However, although there are some reports on the synthesis of hollow boron nitride nanospheres, most of them have some problems, such as relatively poor uniformity, the drugs used are explosives, and the experimental risk factor is relatively high. Boron is in the form of a thin shell, and the cavitation center is relatively large or the cavitation center is not obvious, etc.

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