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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/117030


    Title: Electronic structure and magnetic behaviors of exfoliated MoS 2 nanosheets
    Authors: S1, Sarma;Ghosh, B;SC, Ray;HT, Wang;TS, Mahule;Pong, W.F
    Keywords: exfoliated MoS2-nanosheets;XANES;XPS;VB-PES;room temperature ferromagnetism
    Date: 2019-02-04
    Issue Date: 2019-09-17 12:12:27 (UTC+8)
    Abstract: The correlation of electronic structure and magnetic behaviors of layered molybdenum
    disulfide (MoS2) nanosheets, mechanically exfoliated from pristine hexagonal crystal (2HMoS2) have been studied. Raman spectra show the energy difference (ΔE) between two
    Raman peaks A1g and E1
    2g was about 20.2 cm−1
    , indicating the formation of mono-/bi-layered
    MoS2 nanosheets as obtained after mechanical exfoliation from pristine 2H-MoS2. The
    absence of the reflection peak (0 0 2) in x-ray diffraction patterns confirms the formation of
    few-layered and mono-/bi-layered MoS2 nanosheets with reduced thickness. Mo 3d and S
    2p XPS core level peaks shifted to higher energy with the reduction of the number of layers
    in exfoliated MoS2. As the number of layers decreased, valence band maximum position
    increased from 1.11 eV (pristine MoS2) to 1.57 eV (mono-/bi-layered MoS2 nanosheets),
    whereas the surface work function (Ф) reduced from 4.85 eV (pristine MoS2) to 4.47 eV
    (mono-/bi-layered MoS2 nanosheets), as observed from UPS (He-I) measurements. UPS
    (He-II) spectra, as well as VB-PES spectra of mono-/bi-layered MoS2 nanosheets, exhibits an
    enhanced valence band density of states (DOS) of S 3p—derived states near Fermi level (Ef).
    Mo LII-edge and S K-edge x-ray absorption near edge structure spectra of mono-/bi-layered
    MoS2 nanosheets show the splitting of different peaks that cause a noticeable change in their
    band structure. Magnetic M–H hysteresis loops measurement clearly demonstrates the increase
    of room temperature ferromagnetism from pristine to mono-/bi-layer MoS2, due to the
    existence of defects (‘S’-vacancies or defects at the grain boundaries region) and the increase
    of DOS.
    Relation: Journal of Physics: Condensed Matter 31(13), p.135501
    DOI: 10.1088/1361-648X/aafc12
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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