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XPS survey spectra of untreated and poly(OEGMA) brush-modified SS: (A) untreated SS surfaces, (B) polydopamine SS surfaces, (C) attached initiator polydopamine SS surface, (D) poly(OEGMA) SS, (E) poly(OEGMA) with tethered succinic acid, and (F) poly(OEGMA) with tethered ligand.
