Two-dimensional materials are at the focus of interest, in particular graphene but also two-dimensional niobium diselenide, molybdenum disulfide, hexagonal boron nitride
, mono-layer bismuth strontium calcium copper oxide, and a variety of other layered materials.
The researchers discovered that a very tiny amount of hexagonal boron nitride
(h-BN) particles, two-dimensional cousins to carbon-based graphene, suspended in standard transformer oils are highly efficient at removing heat from a system.
The group analyzed a monolayer hexagonal boron nitride
sample prepared at Oxford University and was able to find and identify three types of atomic substitutions - carbon atoms substituting for boron, carbon substituting for nitrogen and oxygen substituting for nitrogen.
CBN is produced by taking hexagonal boron nitride
, and placing it under very high pressure and temperature which transforms it into a cubic structure.