Fig. 2

Deconvoluted XPS spectra of nano-onion (NO)-COOH, MOS₂ nanosheets, and NO/MoS₂ nanosheet composites. C 1 s spectra of a NO-COOH and b MoS₂ nanosheets. O 1 s spectra of c NO-COOH and d MoS₂ nanosheets. C 1 s spectra of NO/MoS₂ nanosheet composites with weight ratios of e 1:1, g 1:2, i 1:4, and (k) 1:8. O 1 s spectra of NO/MoS₂ nanosheet composites with weight ratios of f 1:1, h 1:2, J 1:4, and l 1:8