Hexagonal Boron Nitride Properties

Boron nitride is a layered material composed of SP2 hybridized atoms, and van der Waals force acts between the layers. Although graphite and boron nitride are electronically equivalent, their properties are different due to the partial ions of the BN bond. Graphite is a conductor, but boron nitride has a large band gap semiconductor. In recent years, the application of boron nitride single layer structure It has become a hot topic. For example, the conductivity of graphite allows us to prepare electrochemical energy storage materials based on carbon.

After research, it has been discovered that it is possible to use nano-sized graphite pores to prepare molecular and ionic devices. After a lot of research by many scientists, one is to control the size of the sheet to change its electrical properties. Another approach to research is to explore chemically modified graphite and similar materials. The chemical adsorption of hydrogen atoms and fully hydrogenated graphite on a single-layer sheet; the chemical adsorption of hydrogen atoms on graphite is predicted to be concentrated: when the coverage is low, the heat of chemisorption is positive, indicating that energy is required to form. However, once there is some adsorption, further adsorption is easier, which eventually leads to a negative average chemisorption heat. Although the heat of chemisorption of the graphite sheet with only one side of the hydrogenation will change with the curvature of the graphite sheet, it is always positive.

However, the binding energy of fully hydrogenated graphite flakes is relatively low. From the description and the similar bond between boron nitride and graphite, we can find out about the existence and properties of the boron carbon nitride BC2N similar to boron nitride and its fully hydrogenated derivative BNH2. Boron nitride has a zinc blende ground state and a hexagonal metastable state equivalent to graphite.