Abstract
Advances in nanophotonics have shown the potential of colloidal metal nanoparticles withsharp tips, such as rods, to focalize plasmonic electromagnetic fields. We report onthe synthesis of Au nanorods via a seed mediated approach and the influenceof silver ions on the aspect ratio of the Au nanorods. The longitudinal surfaceplasmon resonance (LSPR) of the Au nanorods was successfully tuned with theconcentration of silver ions. The surface enhanced Raman scattering (SERS)effect of 2-aminothiophenol (2-ATP) as a probe molecule on Au nanorods wassystematically studied by varying the longitudinal surface plasmon resonance ofthe nanorods. The highest electromagnetic enhancement was observed when thelongitudinal surface plasmon resonance of the Au nanorods overlapped with the laserexcitation wavelength. The variation of the SERS enhancement factor with thelongitudinal surface plasmon resonance and laser excitation lines is also discussed indetail.
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