Synthesis of Atomically Thin Hexagonal Diamond with Compression
Synthesis of Atomically Thin Hexagonal Diamond with Compression
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DOI：
10.1021/acs.nanolett.0c01872
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发表时间：
2020-08-12
期刊：
影响因子：
10.8
通讯作者：
Chen, Bin
中科院分区：
文献类型：
--
作者：
Ke, Feng;Zhang, Lingkong;Chen, Bin
原子薄的金刚石，也称为金刚石，是一种二维碳同素异形体，由于其潜在的物理性质而吸引了相当大的科学兴趣。然而，迄今为止尚未成功合成原始二金刚烷。我们展示了通过压缩机械剥离的少层石墨烯的金刚石化来实现原始的二金刚烷。电阻、光吸收和X射线衍射测量显示，通过在室温下将三层和较厚的石墨烯压缩到20 GPa以上，可以形成带隙为2.8 +/- 0.3 eV的六方二金刚烷（h-二金刚烷），并且可以在减压到类似于1.0 GPa时保存。理论计算表明，（-2110）-取向的H-二金刚烷是能量稳定的，并且在转变压力以上具有比其少层石墨烯前体更低的焓。与无间隙石墨烯相比，半导体h-金刚烷为碳基电子器件提供了令人兴奋的可能性。
Atomically thin diamond, also called diamane, is a two-dimensional carbon allotrope and has attracted considerable scientific interest because of its potential physical properties. However, the successful synthesis of a pristine diamane has up until now not been achieved. We demonstrate the realization of a pristine diamane through diamondization of mechanically exfoliated few-layer graphene via compression. Resistance, optical absorption, and X-ray diffraction measurements reveal that hexagonal diamane (h-diamane) with a bandgap of 2.8 +/- 0.3 eV forms by compressing trilayer and thicker graphene to above 20 GPa at room temperature and can be preserved upon decompression to similar to 1.0 GPa. Theoretical calculations indicate that a (-2110)-oriented h-diamane is energetically stable and has a lower enthalpy than its few-layer graphene precursor above the transition pressure. Compared to gapless graphene, semiconducting h-diamane offers exciting possibilities for carbon-based electronic devices.