新型奈米結構的製備與其在生醫、光電及催化上的應用

Porous plasmonic nanostructures have aroused great attention due to their built-in cavities, which can lead to strong localized electric field enhancement and plasmon tunability. In this study, we propose a new member of porous nanostructures, nanozappers, which are similar to a bug zapper in shape and in function of catching photon with the frame. By utilizing the Galvanic replacement reaction, we can control the longitudinal plasmon modes of the Au-Ag nanozappers ranging from 660 nm to 970 nm. To explore the origin of the spectral shift, we analyze the size, the composition, and the void effects of the Au-Ag nanozappers using computational electrodynamics simulations. Our analysis indicates that the longitudinal plasmon modes are less insensitive to the frame composition of the nanozappers, in contrast to their susceptibility to of the size and the void effects.