Abstract
Surface-enhanced Raman scattering (SERS) has attracted considerable attention for chemical and biological agent detection through the amplification of electromagnetic fields from localized surface plasmon resonance on a metal nanostructure. The fabrication of metal nanostructure is the key issue for applications of SERS substrate. Particularly, well-ordered noble metal nanodot array can be reproducibly fabricated using anodic aluminum oxide layer with uniform channels of nanometer dimensions. In this study, we report the fabrication of Ag nanodot array on indium-tin-oxide (ITO) glass via the nanoporous alumina mask with through-holes and the utilizing the array as a substrate for SERS application. Ag nanodot array with 55 nm diameter was fabricated in periodic pattern with separation distance of 105 nm as a replica of the alumina mask. Optical property of Methylene Blue adsorption on Ag nanodot array was examined by Raman spectroscopy. These results suggest that Ag nanodot array might be useful as a SERS platform for the future application in sensitive detection of chemical materials.
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