Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. carbon

Anotations

Scope note:

An allotropic form of carbon material derived from graphite consisting of sheets one atom thick arranged in a two-dimensional honeycomb lattice. It has exceptionally high tensile strength, electrical conductivity, transparency, and is the thinnest two-dimensional material known.