Rolling Up a Monolayer MoS2Sheet

Jianling Meng, Guole Wang, Xiaomin Li, Xiaobo Lu, Jing Zhang, Hua Yu, Wei Chen, Luojun Du, Mengzhou Liao, Jing Zhao, Peng Chen, Jianqi Zhu, Xuedong Bai, Dongxia Shi*, Guangyu Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Monolayer MoS2 samples were grown by chemical vapor deposition method. The as-grown MoS2 continuous film was then treated argon plasma at a pressure of 0.3 Torr, plasma power of 25 W, and temperature of 150°C for duration of 20 min. Since defect sites in this polycrystalline film are highly reactive; after plasma treatment, the separation of grain boundaries can be clearly seen. Interestingly, the film starts to scroll along the separated edges when we further increase the plasma treatment duration to 40 min. Monolayer MoS2 samples grown on various substrates, including sapphire, BN, and graphite substrates, were also investigated. In order to see the detailed structures of these MoS2 nanoscrolls, high resolution transmission electron microscopy (HRTEM) studies were also carried out. XPS was further used to analyze the MoS2 nanoscroll composition. It is concluded that the generation of S vacancies caused by argon plasma treatment is the key factor of scrolling. This convenient, solvents-free, and high-yielding approach for nanoscroll fabrication is also suitable for the fabrication of other 2D transition metal dichalcogenides.

Original languageEnglish
Pages (from-to)3770-3774
Number of pages5
JournalSmall
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • MoS
  • monolayer sheets
  • nanoscrolls
  • rolling up

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