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SCIENCE CHINA Information Sciences, Volume 64 , Issue 4 : 140406(2021) https://doi.org/10.1007/s11432-020-3173-9

Raman spectra evidence for the covalent-like quasi-bonding between exfoliated MoS$_{2}$ and Au films

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  • ReceivedNov 25, 2020
  • AcceptedJan 21, 2021
  • PublishedMar 8, 2021

Abstract


Acknowledgment

This work was supported by National Key Research and Development Program of China (Grant Nos. 2019YFA0308000, 2018YFA0704201, 2019YFA0307801), National Natural Science Foundation of China (Grants Nos. 11874405, 62022089, 61971035, 61725107, 11974001, U1932153), Youth Innovation Promotion Association of CAS (Grants No. 2019007), Beijing Natural Science Foundation (Grants Nos. 2192022, Z190011), and Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB33000000). We thank Prof. Ping-Heng TAN and Dr. Miaoling LIN for discussion and valuable comments.


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  • Figure 1

    (Color online) (a) Lattice structure and shear modes in 2L and 3L MoS$_{2}$. (b) Layer breathing modes in 2L and 3L MoS$_{2}$. The theoretical Raman peak positions of these modes based on the diatomic chain model are indicated. (c) Schematic image of bi-layer MoS$_{2}$ on Au film. The interaction between S atom and Au atom is indicated. The Au-S interaction can affect the shear mode and layer breathing mode of MoS$_{2}$ layers near the interface.

  • Figure 2

    (Color online) Raman spectra of MoS$_{2}$ exfoliated on Au film and after transferring onto SiO$_{2}$/Si. (a) An optical image of MoS$_{2}$ flake exfoliated on Au film. The layer numbers are labeled on the flake. (b) and (e) are Raman spectra of 1L–10L MoS$_{2}$ (bottom up) on Au film and after transferring onto SiO$_{2}$/Si substrate. The Raman peak of Si is used as reference. (c) and (f) are the statistic of ${\rm~A}_{\rm~1g~}$ and E$^{1}_{\rm~2g}$ peak positions of 1L–10L and bulk MoS$_{2}$, which are exfoliated on Au film and transferring onto SiO$_{2}$/Si substrate, respectively. (d) The relative intensity ratio of ${\rm~A}_{\rm~1g~}$ and $~{\rm~E}^{1}_{\rm~2g}$ modes for 1L–10L MoS$_{2}$.

  • Figure 3

    (Color online) The two dominant Raman peaks (${A}_{1g}$ and ${E}^1_{2g}$) of 1L and 2L MoS$_{2}$ exfoliated on Au film and after transferring onto SiO$_{2}$/Si substrate.

  • Figure 4

    (Color online) Low-frequency Raman spectra of few layer MoS$_{2}$. (a) Raman spectra of 1L–10L suspended MoS$_{2}$. The top-right inset is the optical image of MoS$_{2}$ onto hole array substrate, and the layer numbers from monolayer to 5L are labeled in this image. (b) and (c) are low-frequency Raman spectra of 1L–10L MoS$_{2}$ measure on supported areas and suspended hole areas, respectively. (d) and (e) are Stokes and anti-Stokes Raman spectra of odd (d) and even (e) number layer MoS$_{2}$ in the low-frequency range ($-$45 to 45 cm$^{-1})$. The layer breathing modes and shear modes are indicated by green and red dashed lines. (f) Position of layer breathing and shear modes as a function of layer number. The data points for 2L MoS$_{2}$ on Au film are not shown since the main low-frequency modes is hard to distinguish.

  • Figure 5

    (Color online) Raman spectra of bilayer (a) and tri-layer (b) MoS$_{2}$ in low-frequency range. The black, red and blue curves are measured on the same 2L and 3L flakes exfoliated on Au film, after transferring onto SiO$_{2}$/Si with PMMA and after removing PMMA, respectively. All the Raman spectra are measured using the same parameters.

  • Figure 6

    (Color online) Low-frequency Raman spectra of 1L–10L WS$_{2}$ measure on supported areas (a) and suspended hole areas (b).

  • Table 1  

    Table 1Statistics of main low-frequency peak intensity of 2L to 5LMoS$_{2}$ (0–60 cm$^{-1})^{\rm~a)}$

    Layer numberPeak positionOn Au filmAfter transfer with PMMAAfter transfer without PMMA
    2L22.117.9822.71244.5
    3L27.861.02255.73553.3
    4L22.852.41333.61771.2
    5L19.378.71561.22050.8

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