Surface structure of bulk 2H-MoS 2 (0001) and exfoliated suspended monolayer MoS 2 : A selected area low energy electron diffraction study
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1345750
- Alternate Identifier(s):
- OSTI ID: 1397406
- Report Number(s):
- BNL-113594-2017-JA
Journal ID: ISSN 0039-6028; R&D Project: 16083; KC0403020
- Grant/Contract Number:
- SC00112704; SC0012704; FG 02-04-ER-46157
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Surface Science
- Additional Journal Information:
- Journal Volume: 660; Journal Issue: C; Journal ID: ISSN 0039-6028
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; MoS2; μLEED-IV; 2-D material; Surface structure; LEEM
Citation Formats
Dai, Zhongwei, Jin, Wencan, Grady, Maxwell, Sadowski, Jerzy T., Dadap, Jerry I., Osgood, Richard M., and Pohl, Karsten. Surface structure of bulk 2H-MoS 2 (0001) and exfoliated suspended monolayer MoS 2 : A selected area low energy electron diffraction study. United States: N. p., 2017.
Web. doi:10.1016/j.susc.2017.02.005.
Dai, Zhongwei, Jin, Wencan, Grady, Maxwell, Sadowski, Jerzy T., Dadap, Jerry I., Osgood, Richard M., & Pohl, Karsten. Surface structure of bulk 2H-MoS 2 (0001) and exfoliated suspended monolayer MoS 2 : A selected area low energy electron diffraction study. United States. https://doi.org/10.1016/j.susc.2017.02.005
Dai, Zhongwei, Jin, Wencan, Grady, Maxwell, Sadowski, Jerzy T., Dadap, Jerry I., Osgood, Richard M., and Pohl, Karsten. 2017.
"Surface structure of bulk 2H-MoS 2 (0001) and exfoliated suspended monolayer MoS 2 : A selected area low energy electron diffraction study". United States. https://doi.org/10.1016/j.susc.2017.02.005. https://www.osti.gov/servlets/purl/1345750.
@article{osti_1345750,
title = {Surface structure of bulk 2H-MoS 2 (0001) and exfoliated suspended monolayer MoS 2 : A selected area low energy electron diffraction study},
author = {Dai, Zhongwei and Jin, Wencan and Grady, Maxwell and Sadowski, Jerzy T. and Dadap, Jerry I. and Osgood, Richard M. and Pohl, Karsten},
abstractNote = {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.},
doi = {10.1016/j.susc.2017.02.005},
url = {https://www.osti.gov/biblio/1345750},
journal = {Surface Science},
issn = {0039-6028},
number = C,
volume = 660,
place = {United States},
year = {Fri Feb 10 00:00:00 EST 2017},
month = {Fri Feb 10 00:00:00 EST 2017}
}
Web of Science
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