WU Yang, SUN Youmei, LIU Jie, ZHAI Pengfei, GUO Hang, YAO Huijun, LIU Jiande, LUO jie. Damage Effects of CVD Single-layer MoS2 Irradiated by 209Bi Ions[J]. Nuclear Physics Review, 2018, 35(1): 72-77. doi: 10.11804/NuclPhysRev.35.01.072
Citation:
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WU Yang, SUN Youmei, LIU Jie, ZHAI Pengfei, GUO Hang, YAO Huijun, LIU Jiande, LUO jie. Damage Effects of CVD Single-layer MoS2 Irradiated by 209Bi Ions[J]. Nuclear Physics Review, 2018, 35(1): 72-77. doi: 10.11804/NuclPhysRev.35.01.072
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Damage Effects of CVD Single-layer MoS2 Irradiated by 209Bi Ions
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WU Yang1,2
,
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SUN Youmei1
,
,
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LIU Jie1
,
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ZHAI Pengfei1
,
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GUO Hang1,2
,
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YAO Huijun1
,
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LIU Jiande1
,
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LUO jie1
- 1.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
- 2.
University of Chinese Academy of Sciences, Beijing 100049, China
Funds:
National Natural Science Foundation of China(11675233, 11690041)
- Received Date: 2017-04-13
- Rev Recd Date:
2017-04-25
- Publish Date:
2018-03-20
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Abstract
The layer number of MoS2 with different thickness was determined by the optical microscope and Raman spectra. And the damage effect of the CVD (chemical vapor deposition) prepared single-layer MoS2 sample irradiated by 209Bi ions was analyzed by the combination of Raman analysis and AFM observations. With the increase of irradiation fluence, the Raman characteristic peaks of E2g1 and A1g corresponding to both phonon vibration modes gradually bluely shift, and the intensity of the peaks obviously decreased. This is due to the fact that the 209Bi ion irradiation results in the latent track type lattice defects and they adsorb the oxygen molecules in the air ended with the p-type doping. Meanwhile, from the AFM image of the mono-layer of irradiated MoS2 under the 5×1010 ions/cm2, it can been seen that latent tracks mainly occur in the form of pits, which different from the hillock tracks observed by mechanical stripping method. The influence of different preparation technology to the track morphology is analyzed. Compared with the Raman and AFM results of MoS2 prepared by mechanical stripping, it is considered that different preparation methods will affect the electron density in single or few layers of MoS2.
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