The amorphization of monolayer MoS2 induced by strong oxygen plasma treatment

The amorphization of monolayer MoS2 induced by strong oxygen plasma treatment

By strong oxygen plasma treatment on monolayer MoS2, we observe the disappearance of the Raman modes of MoS2. We propose the hypothesis that the state of MoS2 translates from crystal to amorphous after strong oxygen plasma treatment. The evidences of no MoO3 formation shown by Raman spectra and the...

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Bibliographic Details
Main Authors: Meng, Jian-Ling, Zhu, Jian-Qi, Jia, Shun-Tian, Ren, Xiao
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2021
Subjects:
Engineering::Materials
MoS2
Amorphization
Online Access:https://hdl.handle.net/10356/148712
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Institution: Nanyang Technological University
Language: English
Description
Summary:By strong oxygen plasma treatment on monolayer MoS2, we observe the disappearance of the Raman modes of MoS2. We propose the hypothesis that the state of MoS2 translates from crystal to amorphous after strong oxygen plasma treatment. The evidences of no MoO3 formation shown by Raman spectra and the appearance of the Mo6+ peak and decreased O concentration shown by X-ray photoelectron spectroscopy support our hypothesis. The amorphization of monolayer MoS2 is further confirmed by the quenching of photoluminescence (PL) and the disappearance of two absorption peaks related to A, B exciton which demonstrates the disordered bandgap. Finally, we found that the amorphous MoS2 can improve the absorption fraction at the visible light (500~ 750 nm) which is potential for future visible light photocatalysis.

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