Surface-enhanced Raman Scattering on Ordered Metal Nanodot Array Obtained Using Anodic Porous Alumina

Porous materials are used for the fabrication of nanostructures as templates. And anodic porous alumina is well known as a starting material to fabricate nanostructures. Anodic porous alumina, which is formed by anodization of Al in acidic electrolyte, is a typical self-ordered porous material composed of uniform-sized straight nanoholes. The geometrical structures of anodic porous alumina are able to be controlled easily by changing anodizing conditions. The fabrication of ordered arrays of metal nanoparticles has attracted increasing attention owing to their capability to enhance the electric filed of incident light based on localized surface plasmon resonance (LSPR).1-3) Various types of applications of metal nanoparticle arrays, such as chemical and biologica