Fluorination of graphene leads to susceptibility for nanopore formation by highly charged ion impact,Physical Review Materials

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Fluorination of graphene leads to susceptibility for nanopore formation by highly charged ion impact
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-07-26 , DOI: 10.1103/physrevmaterials.5.074007
S. Creutzburg _{1,

2} , M. Mergl ₃ , R. Hübner ₁ , I. Jirka ₃ , D. Erb ₁ , R. Heller ₁ , A. Niggas ₄ , P. L. Grande ₅ , F. Aumayr ₄ , R. A. Wilhelm ₄ , M. Kalbac ₃ , S. Facsko ₁

Affiliation

The formation of nanopores by highly charged ion impacts on freestanding fluorine-functionalized graphene is demonstrated. The process is driven by potential sputtering, which becomes active by changing the semimetallic property of graphene into a strongly insulating state by fluorination. The interaction of fluorographene with highly charged ions is also studied in terms of charge exchange and kinetic energy loss. A higher number of captured electrons and a larger kinetic energy loss than in pristine graphene are observed, which can be well explained by an increase in the ion neutralization length and in the atomic areal density of the target, respectively. Using a computer code based on a time-dependent scattering potential model, a connection between the efficiency of charge exchange and the fluorine coverage is revealed. Our results suggest a competition of two distinct nanostructure formation processes, leading either to pore formation or fluorine desorption.

中文翻译：

石墨烯的氟化导致通过高电荷离子撞击形成纳米孔的敏感性

证明了通过高电荷离子撞击独立的氟功能化石墨烯形成纳米孔。该过程由电位溅射驱动，通过氟化将石墨烯的半金属特性改变为强绝缘状态，从而变得活跃。还从电荷交换和动能损失方面研究了氟石墨烯与高电荷离子的相互作用。观察到比原始石墨烯更多的捕获电子和更大的动能损失，这可以分别通过离子中和长度和目标原子面密度的增加来很好地解释。使用基于时间相关散射电位模型的计算机代码，揭示了电荷交换效率与氟覆盖率之间的联系。

更新日期：2021-07-26

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