Controlled Assembly of Highly Raman‐Enhancing Silver Nanocap Arrays Templated by Porous Anodic Alumina Membranes

作者：Teng Fei Qiu, Wenjun Zhang, Xianzhong Lang, Yong Jin Zhou, Tie Jun Cui, Paul K. Chu · 发表于：Small · 年份：2009 · DOI：10.1002/smll.200900577 · 被引用次数：101 · 研究领域：Anodic Oxide Films and Nanostructures、Gold and Silver Nanoparticles Synthesis and Applications、Plasmonic and Surface Plasmon Research

A convenient nanoscale technique is reported for the fabrication of highly ordered hemispherical silver nanocap arrays templated by porous anodic alumina (PAA) membranes as robust and cost-efficient surface-enhanced Raman scattering (SERS) substrates. This geometry produces a high Raman signal due to its periodic hexagonal arrangements and control of the gap between the nanostructures in the sub-10-nm regime. The surface structure can be tuned further to optimize the enhancement factor according to optional PAA fabrication and silver deposition parameters. Finite-difference time-domain calculations indicate that the structure may possess excellent SERS characteristics due to the high density and abundance of hot spots.