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Electron microscopic and spectroscopic characterization of Au@Ag-NRs formed upon mixing PD-NRs with 0 μM (a-e), 100 μM (f-j), and 300 μM (k-o) AgNO3. Electron microscopy was performed in dark field mode (a,f,k) with energy dispersive x-ray spectroscopy (EDS) spectral imaging of silver (b,g,l), gold (c,h,m) and merged silver/gold (d,i,n). Optical extinction spectra of each sample are shown at right (e,j,o) with color photographs of suspensions (inset). Scale bars = 20 nm.
