^(40)Ar^+诱导无定形碳到金刚石纳米晶相变的研究

Phase transition from amorphous carbon to diamond nanocrystalline induced by ^(40)Ar^+

通过60keV的40Ar+辐照无定形碳靶合成了大量尺寸不同的金刚石纳米颗粒.高分辨透射电子显微镜配合能量色散X射线谱和电子衍射以及Raman谱分析的结果表明,这些嵌于具有扰动石墨结构薄膜中的纳米金刚石颗粒,其成核率很高(约为1013/cm2),而且可以生长到较大的尺寸,有的甚至可以达到微米量级.对其相转变过程也进行了初步探讨.

Large-scale diamond nanocrystals of different sizes were synthesized Investigated by high-resolution transmission electron microscopy, energy Raman spectrum, the diamond crystallites embeded in graphitic film have grow to large sizes even of the micrometer order. The mechanism of phase by 60 keV ^40 Ar^＋ irradiation on amorphous carbon. diffraction X-ray spectrum, electron diffraction and a high nucleation density （about 10^13/cm^2） and can transition is discussed preliminarily.