Tuesday, October 31, 2006

US Patent 7128889 - Nanodiamond Film


Diamond films are useful for protective films and other coatings for their hardness and thermal conductivity. Ultrananocrystalline diamond has been used for these films in the past but such films have included microcrystalline diamond as well. This patent teaches using a plasma enhanced CVD method to form nanocrystalline diamond films of higher purity. Claim 1 reads:

1. An ultrananocrystalline diamond (UNCD) film having an average grain size between 3 and 5 nanometers (nm) with not more than about 8% by volume diamond having an average grain size larger than 10 nm.