Chinese Physics B, Volume. 29, Issue 10, (2020)

Characterization of swift heavy ion tracks in MoS2 by transmission electron microscopy

Li-Jun Xu1...2, Peng-Fei Zhai1,2,†, Sheng-Xia Zhang1, Jian Zeng1,2, Pei-Pei Hu1, Zong-Zhen Li1,2, Li Liu1,2, You-Mei Sun1,2, and Jie Liu12 |Show fewer author(s)
Author Affiliations
  • 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
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    Figures & Tables(7)
    A sketch map of experiment process.
    Plan-view TEM images of MoS2 after swift heavy ion irradiation with (a), (b) 129Xe 5×1012 ions/cm2, (c), (d) 181Ta 5×1010 ions/cm2, and (e), (f) 209Bi 5×1011 ions/cm2. The left and right rows are the phase contrast images obtained at under-focus and over-focus conditions, respectively.
    Statistical diameter distribution of ion tracks in irradiated MoS2 with different electronic energy losses. The average diameters of the ion tracks (Da) are fitted according to Gaussian curve.
    TEM images of different ion track morphologies of MoS2 irradiated at 30° with 1785.7 MeV 181Ta ions. (a) Nearly cylindrical ion tracks consist of two spherical hillocks at each end. (b) Sandglass-like ion tracks. The apparent length in MoS2 sample is about 180 nm. (c) The q-tips-like ion tracks. The size of hillocks increases with increasing apparent length.
    Schematics of the formation process of ion track in irradiated MoS2 with SHIs. (a) SHIs bombardment. (b) Target material melting along the ion path. (c) Outflow of molten phase towards the free surface. (d) Recrystallization in ion damage zone.
    • Table 1. Irradiation parameters for MoS2.

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      Table 1. Irradiation parameters for MoS2.

      IonEnergy/MeV(dE / x)e/(keV/nm)(dE/dx)n/(keV/nm)Range/μmFluence/(ions/cm2)
      86Kr2029.47.73.9×10−3193.65×1010
      86Kr1795.38.24.4×10−3164.05×1010
      86Kr1503.49.15.1×10−3130.25×1010
      129Xe2047.518.91.2×10−296.85×1012
      181Ta1785.728.83.2×10−265.85×1010
      209Bi1390.035.25.7×10−246.85×1011
    • Table 2. Track related parameters of MoS2 with different morphologies. Morphology, hillock diameter (Dh), apparent track length (Lap), and actual track length (Lac) were obtained from TEM measurements in Fig. 3.

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      Table 2. Track related parameters of MoS2 with different morphologies. Morphology, hillock diameter (Dh), apparent track length (Lap), and actual track length (Lac) were obtained from TEM measurements in Fig. 3.

      MorphologyLap/nmLac/nmDh/nm
      cylinders30.5±1.035.2±1.24.0±0.2
      sunglass180.3±1.1208.2±1.316.6±0.7
      q-tips187.4±1.4216.4±1.620.6±1.1
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    Li-Jun Xu, Peng-Fei Zhai, Sheng-Xia Zhang, Jian Zeng, Pei-Pei Hu, Zong-Zhen Li, Li Liu, You-Mei Sun, Jie Liu. Characterization of swift heavy ion tracks in MoS2 by transmission electron microscopy[J]. Chinese Physics B, 2020, 29(10):

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    Paper Information

    Received: Apr. 27, 2020

    Accepted: --

    Published Online: Apr. 21, 2021

    The Author Email: Zhai Peng-Fei (j.liu@impcas.ac.cn)

    DOI:10.1088/1674-1056/abad1e

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