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Elemental composition and valence states. (A) Survey XPS spectra of full elements of fabricated BS, WS, and BW heterostructure nanosheets. (B) XPS spectra of Bi 4f in BS and BW heterostructure nanosheets. (C) XPS spectra of W 4f in BS and BW heterostructure nanosheets. (D) XPS spectra of Se 3d in BS and BW heterostructure nanosheets.
