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SEM images (A) and water contact angles (B) of PEEK, SPEEK, SPEEK–pDA, and SPEEK–pDA–GS. (C) FTIR spectra of pDA, GS + pDA, and GS. Inset of (A) presents the EDS spectra of the obtained SEM imaging area of the corresponding samples. (n = 3, * p < .05, ** p < .01, and*** p < .001).
