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Extinction profile of Au nanorods (λLPR = 795 nm). The short wavelength peak (λ~ 520 nm) is from the nanorods’ transverse plasmon mode; the intermediate peak (λ~ 610 nm) is produced by a small percentage of non-rodlike nanoparticles. Inset: TEM image of nanorods (JEOL 2000FX, 200kV).
