CROSS-SECTIONAL HIGH-RESOLUTION TRANSMISSION ELECTRON-MICROSCOPE STUDY OF HETEROEPITAXIAL DIAMOND FILM GROWN ON PT SUBSTRATE

Heteroepitaxial diamond film grown on Pt(111) was studied ty cross-sec tional high-resolution transmission electron microscopy (HRTEM). It is found Chat the interface has a complicated structure including a thic k layer of graphite and many small Pt fragments. The epitaxial growth of diamond on Pt substrate; is confirmed to be effective with a relati onship of diamond(lll)//Pt(lll) and diamond(110)//Pt(110). A high-reso lution image of the interface between diamond and Pt reveals that diam ond particles directly connect with Pt-in the absence of an intermedia te layer. In some areas, graphite also shows a structural relationship with the Pt substrate and diamond, The graphite(0001) planes tend to be formed parallel to the Pt surface. A high-resolution image ol the i nterface between graphite and diamond shows graphite(0001)//diamond(ll l) with three diamond(lll) planes matching up with two graphite(0001) planes. Some possible heteroepitaxial and nucleation mechanisms are di scussed.