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LSPR properties of the AgAuPt and AuPt alloy NPs fabricated with the Ag55nm/Au15nm/Pt15nm tri-layers. (a–a-3) Extinction and normalized extinction spectra. (b–b-3) Reflectance and normalized reflectance spectra. (c) Transmittance spectra. (d) AFM image of the typical AuPt NP. (e, f) E-field distribution and e-field vector plot of a typical AuPt NP, respectively.
