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Title: Anisotropic ordering in 1T′ molybdenum and tungsten ditelluride layers alloyed with sulfur and selenium
Authors: Lin, Junhao
Zhou, Jiadong
Zuluaga, Sebastian
Yu, Peng
Gu, Meng
Liu, Zheng
Pantelides, Sokrates T.
Suenaga, Kazu
Keywords: Engineering::Materials
Issue Date: 2018
Source: Lin, J., Zhou, J., Zuluaga, S., Yu, P., Gu, M., Liu, Z., . . . Suenaga, K. (2018). Anisotropic ordering in 1T′ molybdenum and tungsten ditelluride layers alloyed with sulfur and selenium. ACS Nano, 12(1), 894-901. doi:10.1021/acsnano.7b08782
Journal: ACS Nano
Abstract: Alloying is an effective way to engineer the band-gap structure of two-dimensional transition-metal dichalcogenide materials. Molybdenum and tungsten ditelluride alloyed with sulfur or selenium layers (MX2xTe2(1–x), M = Mo, W and X = S, Se) have a large band-gap tunability from metallic to semiconducting due to the 2H-to-1T′ phase transition as controlled by the alloy concentrations, whereas the alloy atom distribution in these two phases remains elusive. Here, combining atomic resolution Z-contrast scanning transmission electron microscopy imaging and density functional theory (DFT), we discovered that anisotropic ordering occurs in the 1T′ phase, in sharp contrast to the isotropic alloy behavior in the 2H phase under similar alloy concentration. The anisotropic ordering is presumably due to the anisotropic bonding in the 1T′ phase, as further elaborated by DFT calculations. Our results reveal the atomic anisotropic alloyed behavior in 1T′ phase layered alloys regardless of their alloy concentration, shining light on fine-tuning their physical properties via engineering the alloyed atomic structure.
ISSN: 1936-0851
DOI: 10.1021/acsnano.7b08782
Rights: © 2018 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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