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. 2017 May 16;7:1983. doi: 10.1038/s41598-017-02228-8

Figure 3.

Figure 3

Effect of water supply II: removal of molybdenum oxides. (a) SEM, (b) AFM images of as-grown MoS2 flakes without the water supply. Unresolved particles are distributed on the whole region. (c,d) XPS core level spectra of (c) Mo 3d and (d) S 2p for three MoS2 specimens: without (w/o) water, H2O 1 sccm, and H2O 10 sccm, respectively. The characteristic peaks of Mo4+3d3/2, Mo4+3d5/2, S 2s, S 2p1/2, and S 2p3/2 correspond to MoS2 whereas the peaks of Mo6+3d3/2 and Mo6+3d5/2 correspond to molybdenum oxide.