Single-Photon-Single-Electron Transition for Interpretation of Optical Spectra of Nonspherical Metal Nanoparticles in Aqueous Colloidal Solutions

Figure 4

(a) Optical absorption spectra of Au nanorods. Here, an increasing seed volume leads towards a red shift of the main absorption mode. With increasing seed particle density, the aspect ratio of the rods increases, not the rod length. Rods prepared under conditions of high seed particle densities are slightly shorter but markedly thinner. (b) UV-Vis spectra of Au nanorods with aspect ratios between 2.07 and 7.79.

(a)

(b)