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(a) Survey scan of Au/PNIPAm/PEI microgel. Inset is Au 4f XPS spectrum of Au nanoparticles; (b) Survey scan of Ag@AuPNIPAm/PEI microgel film (Au/Ag of 50/50 mol. ratio); (c) Au 4f XPS spectrum; and (d) Ag 3d XPS spectrum of Ag@Au bimetallic nanoparticles.
