Fig. 5. (a) The full XPS spectra of the P2W18-DDC, (b) the W 4f XPS spectra of P2W18-DDC, (c) the O 1s XPS spectra of P2W18-DDC (d) the full XPS spectra of the PW12-DDC, (e) the W 4f XPS spectra of PW12-DDC, (f) the O 1s XPS spectra of PW12-DDC.
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