In the case of platinum substrates, azimuthal orientation and coalescence o
f diamond films depend on the size of the nucleus and the nucleation densit
y. It was found that the size and density of diamond particles are signific
antly influenced by the substrate temperature during the early stage of syn
thesis. The results obtained here in the present experimental study indicat
e that both the size of the nucleus and the nucleation density should be co
ntrolled for the fabrication of heteroepitaxial diamond film on platinum.