Highly Sensitive Vertically Standing Ag Nanorod Arrays Substrates for Surface Enhanced Fluorescence studies

摘要

The nanorods length dependence of surface enhanced fluorescence (SEF) has been investigated for Rhodamine 6G films adsorbed onto Ag nanorods array substrates grown by glancing angle deposition technique. It is found that the substrate enhancement efficiency increases with increase in the length (l) of nanorods from 450 nm to 1.7 μm. The silver nanorod arrays substrate with l = 1.6 μm exhibited a remarkable enhancement factor (EF) of 72. However, the rate of increment in EF did not remain same. It varies faster for the values of l up to ~1 μm and after that it increases at comparatively slower rate. The understanding of the effect of nanorods morphology on EF and the identification of high sensitivity SEF substrates is the novelty of this work. These SEF substrates can be used for sensing and trace detection of the fluorescent biological and chemical compounds.