期刊
SURFACE SCIENCE
卷 660, 期 -, 页码 16-21出版社
ELSEVIER
DOI: 10.1016/j.susc.2017.02.005
关键词
MoS2; mu LEED-IV; 2-D material; Surface structure; LEEM
资金
- U.S. DOE Office of Science Facilities, at Brookhaven National Laboratory [DE-SC0012704]
- NSF [DMR 1006863]
- U.S. Department of Energy [DE-FG 02-04-ER-46157]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006863] Funding Source: National Science Foundation
We have used selected area low energy electron diffraction intensity-voltage (mu LEED-IV) analysis to investigate the surface structure of crystalline 2H molybdenum disulfide (MoS2) and mechanically exfoliated and suspended monolayer MoS2. Our results show that the surface structure of bulk 2H-MoS2 is distinct from its bulk and that it has a slightly smaller surface relaxation at 320 K than previously reported at 95 K. We concluded that suspended monolayer MoS2 shows a large interlayer relaxation compared to the MoS2 sandwich layer terminating the bulk surface. The Debye temperature of MoS2 was concluded to be about 600 K, which agrees with a previous theoretical study. Our work has shown that the dynamical mu LEED-IV analysis performed with a low energy electron microscope (LEEM) is a powerful technique for determination of the local atomic structures of currently extensively studied two-dimensional (2-D) materials.
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