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(a) XPS spectra S 2S and S 2P curves of pristine polymer films and films doped with FeCl3 (0.1 M) for 15 min; (b) UPS spectra (He I α radiation, photon energy = 21.22 eV) showing the secondary electron cut-off region for polymers in pristine and films doped with FeCl3 (0.1 M) for 15 min.
