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TEM images of (a) AuNRs, (b) Au@Pt−Ag+, and (c) Au@Pt+Ag+. (d) Absorption spectra of AuNRs (black), Au@Pt−Ag+ (red), and Au@Pt+Ag+ (blue). (e) Dispersibility of AuNRs, Au@Pt−Ag+, and Au@Pt+Ag+ in water. Annotation: Au@Pt−Ag+ and Au@Pt+Ag+ represent Au@Pt prepared in the absence and presence of Ag+, respectively.
