Single Au and Ag nanorods have successfully been formed by the electrodeposition into the pores of anodized aluminum films. Further, Au-Ag alternate nanowires were prepared by cycling the Au- and Ag-electrodeposition. The aspect ratio of the anisotropic particles was tunable by the bath voltage. In the suspension of the single metal nanorods, the surface plasmon bands corresponding to the major and minor axes red- and blue-shifted, respectively, as the aspect ratio increased. On the other hand, in the suspension of the Au-Ag alternate nanowires, only one peak was observed for the major-axis surface plasmon band, while the Au- and Ag-surface plasmon bands were separately present as the minor-axis mode.
View full abstract