Patent ID: 11858856
Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. Polycrystalline diamond having a diamond single phase as basic composition, wherein
the polycrystalline diamond includes a plurality of crystal grains,
the polycrystalline diamond contains boron, hydrogen, oxygen, and a remainder containing carbon and trace impurities,
the boron is dispersed in the crystal grains at an atomic level, and greater than or equal to 90 atomic % of the boron is present in an isolated substitutional type,
the hydrogen and the oxygen are present in an isolated substitutional type or an interstitial type in the crystal grains,
each of the crystal grains has a grain size of less than or equal to 500 nm, and
the polycrystalline diamond has a surface covered with a protective film,
wherein the protective film is a graphene nanoribbon film.