Surface structure of bulk 2H-MoS 2 (0001) and exfoliated suspended monolayer MoS 2 : A selected area low energy electron diffraction study

Dai, Zhongwei; Jin, Wencan; Grady, Maxwell; Sadowski, Jerzy T.; Dadap, Jerry I.; Osgood, Richard M.; Pohl, Karsten

doi:10.1016/j.susc.2017.02.005

Title: Surface structure of bulk 2H-MoS ₂ (0001) and exfoliated suspended monolayer MoS ₂ : A selected area low energy electron diffraction study

Journal Article · Fri Feb 10 04:00:00 UTC 2017 · Surface Science

DOI: https://doi.org/10.1016/j.susc.2017.02.005 · OSTI ID:1345750

Dai, Zhongwei ^[1]; Jin, Wencan ^[2]; Grady, Maxwell ^[1]; Sadowski, Jerzy T. ^[3]; Dadap, Jerry I. ^[2]; Osgood, Richard M. ^[2]; Pohl, Karsten ^[1]

Univ. of New Hampshire, Durham, NH (United States). Dept. of Physics and Materials Science Program
Columbia Univ., New York, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials

Here, we used selected area low energy electron diffraction intensity-voltage (μLEED-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 μLEED-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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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI ID:: 1345750

Report Number(s):: BNL--113594-2017-JA; KC0403020

Journal Information:: Surface Science, Journal Name: Surface Science Journal Issue: C Vol. 660; ISSN 0039-6028

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Surface structure of bulk 2H-MoS 2 (0001) and exfoliated suspended monolayer MoS 2 : A selected area low energy electron diffraction study

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Title: Surface structure of bulk 2H-MoS ₂ (0001) and exfoliated suspended monolayer MoS ₂ : A selected area low energy electron diffraction study