金刚石的金属包覆膜的FESEM研究

Study on metallic film surrounding diamond by FESEM

利用场发射扫描电子显微镜(FESEM)研究了金刚石的金属包覆膜微观形貌。结果发现,金属包覆膜内表面长有大量的尺寸为30-100nm的类金刚石颗粒,包覆膜断截面有与内表面垂直的层状结构,靠近包膜内层的层面分布有团簇状10nm级的类金刚石颗粒。分析认为,石墨中碳原子进入包覆膜后先以金属碳化物的形式存在,在催化相的反应协助下,首先形成团簇状细小的纳米类金刚石颗粒,然后,通过包覆膜片层间隙扩散至包膜内表面,长大为具有较规则晶形的纳米类金刚石颗粒,最后沉积在金刚石表面,使金刚石晶体以层状方式生长。

Field Emission Scanning Electron Microscope （FESEM） was used to investigate the micro-morphology of metal film surrounding diamond. Results showed that there exited abundant diamond-like crystals size of 30-100 nm on the metal film surface, whose cross-section had the layer structure vertical to inner surface. Some diamond-like clusters in dimension of 10 nm were found on the inside surface. It is considered that the carbon atoms of graphite enters into the metal film and forms metallic carbides firstly. Then the metal carbides were transformed into nano-diamond-like clusters under the effect of catalyst, which diffused to inner surface through the film interval and grew up as the regular nano-diamond-like crystals. Finally the crystals accumulated on the diamond surface and the diamond crystals grow as layers.