Stable method for preparing boron nitride nanoflake through liquid-phase chemical stripping

Abstract

The invention discloses a stable method for preparing a boron nitride nanoflake through liquid-phase chemical stripping. The method comprises the following steps: (1) subjecting hexagonal boron nitride and strong acid to mixing and infiltration, adding ferrate, carrying out uniform mixing and then carrying out a reaction; (2) after the reaction, adding a reaction product into distilled water drop by drop for dilution; (3) subjecting a diluted solution to centrifugation so as to remove large pieces of unstripped boron nitride powder; and (4) subjecting supernatant liquid to pumping filtration so as to obtain a reaction product, cleaning the reaction product with hydrochloric acid at first, then washing the reaction product with deionized water until the reaction product is neutral and drying the product so as to obtain the boron nitride nanoflake. According to the invention, the boron nitride nanoflake is prepared through a reaction between strong acid and ferrate; raw materials are easily available; the method is safe, stable, free of pollution and simple to operate; complex and expensive equipment is not needed; and the boron nitride nanoflake is high in yield and good in quality.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of inorganic non-metallic materials, and in particular relates to a method for preparing boron nitride nanosheets through stable liquid-phase chemical exfoliation. Background technique [0002] In 2004, Geim and Novoselov from the University of Manchester, UK, used a simple "micromechanical force splitting method" to prepare a two-dimensional nanomaterial with a single atomic layer thickness - graphene. Starting from this, graphene and similar Graphene two-dimensional materials have gradually become one of the research focuses. [0003] Hexagonal boron nitride (h-BN) has a similar layered structure to graphite, and each layer is composed of B atoms and N atoms alternately arranged to form an infinitely extending hexagonal honeycomb structure. Because of its white color, there is a "white graphite "The name. Boron nitride nanosheets have excellent mechanical properties, high thermal c...

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Problems solved by technology

Although the above methods have successfully prepared boron nitride nanosheets, there are still some shortcomings in these methods, which limit the preparation and application of boron nitride nanosheets.

For example, the mechanical exfoliation method generally tends to cause certain defects to the nanosheets, the chemical exfoliation method sometimes requires the use of dangerous or toxic chemical reagents and produces harmful by-products, the ultrasonic-assisted solvent exfoliation method takes a long time, chemical vapor deposition and Solid phase reaction method generally needs to use higher reaction temperature or reaction pressure, complex and expensive equipment

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