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FT-IR absorption spectra of (a) free PAA and PAA-coated Pt-NPs, (b) free PAAMA and PAAMA-coated Pt-NPs, and (c) free PMVEMA and PMVEMA-coated Pt-NPs: “as” and “ss” indicate asymmetric and symmetric stretchings of COO−, respectively. (d) Schematic diagrams showing PAA-, PAAMA-, and PMVEMA-coating structures on Pt-NP surfaces: multiple bonds may exist between many COO− groups of a polymer and many Pt atoms on the Pt-NP surface.
