Linear- and parallel-aligned gold nanorods (GNRs) were self-assembled on glass substrates and their surface-enhanced Raman scattering effect was investigated. GNRs were prepared by seed-mediated growth method and self-assembled to form linear and parallel aggregation on the substrate. The parallel-aligned GNRs showed weak optical absorption intensities in the visible to infrared wavelength region. On the other hand, the linear-aligned GNRs exhibited strong optical absorption bands peaking at 830 and 2200 nm, which are assigned to the weakly coupled surface plasmons of the GNRs. When Rhodamine-6G molecules were adsorbed on the linear-aligned GNRs, strong surface-enhanced Raman scattering spectra were observed. (c) 2007 American Institute of Physics.
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