An investigation of diamond film deposition in a premixed oxyacetylene flame

Diamond film has been deposited in a single-nozzle premixed oxyacetylene flame. Results of runs of varying duration suggest that diamond is deposited via the transport of hydrocarbon fragments produced at the secondary flame front. Planar laser-induced photodissociation fluorescence suggests that this region is rich in C2H species. Emission studies also suggest that the post-primary flame zone presents a source of C2 radicals that may account for the observed graphite and diamondlike carbon deposited on the substrate exposed to this region of the flame. The results on the premixed flame suggest that it would be possible and more convenient to attempt large area deposition using a multinozzle diffusion flame.