Fig. 4

Raman and XPS spectra. a Raman spectra of each XO@1T-MoS₂ nanosheet (red: 2H-MoS₂; green: 1T-MoS₂; blue: FeO@1T-MoS₂; light blue: CoO@1T-MoS₂; pink: NiO@1T-MoS₂). b–d High-resolution XPS signals of b Mo 3d; c S 2p; d Ni 2p for the NiO@1T-MoS₂ nanosheet