Self-Organization of Amorphous Carbon Nanocapsules into Diamond Nanocrystals Driven by Self-Nanoscopic Excessive Pressure under Moderate Electron Irradiation without External Heating
Self-Organization of Amorphous Carbon Nanocapsules into Diamond Nanocrystals Driven by Self-Nanoscopic Excessive Pressure under Moderate Electron Irradiation without External Heating
复制标题
中等电子辐照下无外部加热的自纳米超压驱动非晶碳纳米胶囊自组织成金刚石纳米晶
DOI：
10.1002/smll.201702072
复制
发表时间：
2018
期刊：
影响因子：
13.3
通讯作者：
Guo Zhiguang
中科院分区：
文献类型：
--
作者：
Wang Chengbing;Ling San;Yang Jin;Rao Dewei;Guo Zhiguang
Phase transformation between carbon allotropes usually requires high pressures and high temperatures. Thus, the development of low‐temperature phase transition approaches between carbon allotropes is highly desired. Herein, novel amorphous carbon nanocapsules are successfully synthesized by pulsed plasma glow discharge. These nanocapsules are comprised of highly strained carbon clusters encapsulated in a fullerene‐like carbon matrix, with the formers serving as nucleation sites. These nucleation sites favored the formation of a diamond unit cell driven by the self‐nanoscopic local excessive pressure, thereby significantly decreasing the temperature required for its transformation into a diamond nanocrystal. Under moderate electron beam irradiation (10–20 A cm−2) without external heating, self‐organization of the energetic carbon clusters into diamond nanocrystals is achieved, whereas the surrounding fullerene‐like carbon matrix remains nearly unchanged. Molecular dynamics simulations demonstrate that the defective rings as the active sites dominate the phase transition of amorphous carbon to diamond nanocrystal. The findings may open a promising route to realize phase transformation between carbon allotropes at a lower temperature.
