Abstract
ABSTRACT Silver nanorod arrays with different lengths fabricated by oblique angle deposition at various vapor deposition angles have been studied systematically by surface-enhanced Raman scattering (SERS). The SERS response of those substrates strongly depends on the length of the nanorods and the deposition angle, and the highest SERS enhancement factor can reach close to 10 9 . The reflections of the support su bstrate where the Ag nanorods are grown directly affect the SERS enhancement. In addition, the SERS response strongly depends on the incident configuration of the excitation beam, such as polarization and incident angle. We also find that the probe molecules on the side surface of nanorods contribute the most to the SERS intensity. This is due to the anisotropic optical properties of nanorods and the thickness of the nanorods. This study demonstrates that the Ag nanorod arrays are highly sensitive, uniform, and stable SERS substrates, and its SERS mechanism depends on the complex nanorod film geometry. Keywords: Ag nanorods, oblique an gle deposition, surface enhanced Raman sca ttering, anisotropic optical properties
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