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(a) SEM images of NW−P2W17V (inset: the cross-sectional images of prepared films); (b) EDS mapping of NW−P2W17V for P, W, Ti and V respectively; (c) 2D AFM images; and (d) 3D AFM images of NW−P2W17V films; High-resolution XPS spectra for Ti 2p (e) and W 4f (f).
