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. 2016 Feb 10;7:10672. doi: 10.1038/ncomms10672

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(a) SEM image of M-MoS₂ showing the nanosheet structures. Scale bar, 100 nm. (b) Raman shift of M-MoS₂ and S-MoS₂. (c,d) High-resolution X-ray photoelectron spectroscopy (XPS) spectra of Mo 3d (c) and S 2p (d) for M-MoS₂ and S-MoS₂.