Nano-hillock formation in diamond-like carbon induced by swift heavy projectiles in the electronic stopping regime: Experiments and atomistic simulations
Nano-hillock formation in diamond-like carbon induced by swift heavy projectiles in the electronic stopping regime: Experiments and atomistic simulations
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DOI：
10.1063/1.4752455
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发表时间：
2012-09
影响因子：
4
通讯作者：
D. Schwen;E. Bringa;J. Krauser;A. Weidinger;C. Trautmann;H. Hofsäss
中科院分区：
文献类型：
--
作者：
D. Schwen;E. Bringa;J. Krauser;A. Weidinger;C. Trautmann;H. Hofsäss
利用5 × 106原子的大尺度分子动力学模拟和热峰模型，对类金刚石碳表面小丘的形成进行了实验研究.快重离子的辐照实验覆盖了12至72 keV/nm之间的大电子停止范围。实验和模拟表明，超过阻止功率阈值，小丘的高度与电子停止线性增加，并同意非常好地假设在电子能量转移到晶格的效率约为20%。模拟还显示了sp3到sp2键合的过渡沿着轨道与几乎没有sp3贡献的小丘。
The formation of surface hillocks in diamond-like carbon is studied experimentally and by means of large-scale molecular dynamics simulations with 5 × 106 atoms combined with a thermal spike model. The irradiation experiments with swift heavy ions cover a large electronic stopping range between ∼12 and 72 keV/nm. Both experiments and simulations show that beyond a stopping power threshold, the hillock height increases linearly with the electronic stopping, and agree extremely well assuming an efficiency of approximately 20% in the transfer of electronic energy to the lattice. The simulations also show a transition of sp3 to sp2 bonding along the tracks with the hillocks containing almost no sp3 contribution.