Development of novel ultrahard materials is of great interest to the material science community. In particular, carbon nitride films have attracted a lot of interest due to its extreme properties. The hardness of pure b-C_3N_4 has been predicted to be at least equal, and perhaps greater, than that of diamond. University of Tulsa researchers Saibal Mitra, Justin Hartman (Department of Physics and Engineering Physics, University of Tulsa, Tulsa, OK 74104), and Tobias Hanrath (Department of Chemical Engineering, University of Tulsa, Tulsa, OK 74104) grew ultrahard phase of carbon nitride using hot-filament chemical vapor deposition (HFCVD). They deposited carbon nitride films on (100) oriented crystalline Si substrate by activating a mixture of CH_4/NH_3 over a hot tungsten filament.
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