Iveković Damjan, Žugec Petar, Karlušić Marko
Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, 10000 Zagreb, Croatia.
Materials (Basel). 2021 Oct 22;14(21):6289. doi: 10.3390/ma14216289.
High energy ion irradiation is an important tool for nanoscale modification of materials. In the case of thin targets and 2D materials, which these energetic ions can pierce through, nanoscale modifications such as production of nanopores can open up pathways for new applications. However, materials modifications can be hindered because of subsequent energy release via electron emission. In this work, we follow energy dissipation after the impact of an energetic ion in thin graphite target using Geant4 code. Presented results show that significant amount of energy can be released from the target. Especially for thin targets and highest ion energies, almost 40% of deposited energy has been released. Therefore, retention of deposited energy can be significantly altered and this can profoundly affect ion track formation in thin targets. This finding could also have broader implications for radiation hardness of other nanomaterials such as nanowires and nanoparticles.
高能离子辐照是材料纳米尺度改性的重要工具。对于这些高能离子能够穿透的薄靶材和二维材料而言，诸如纳米孔产生等纳米尺度改性可为新应用开辟途径。然而，由于随后通过电子发射释放能量，材料改性可能会受到阻碍。在这项工作中，我们使用Geant4代码追踪高能离子撞击薄石墨靶材后的能量耗散情况。呈现的结果表明，靶材会释放大量能量。特别是对于薄靶材和最高离子能量，几乎40%的沉积能量已被释放。因此，沉积能量的保留情况可能会发生显著改变，这会深刻影响薄靶材中的离子径迹形成。这一发现对于其他纳米材料（如纳米线和纳米颗粒）的辐射硬度也可能具有更广泛的影响。
