Guided Wrinkling of Hierarchically Structured Nanoporous Gold Films for Improved Surface‐Enhanced Raman Scattering Performance

Plasmonic nanostructured metals have many advantages for applications in high-performance surface-enhanced Raman scattering (SERS) spectroscopy. In particular, unique designing nanostructures with bicontinuous ligaments surrounded by cylindrical voids tunable dense pores from a few to hundreds of nanometers can be utilized the SERS-active substrate. Here, fabrication strategy is reported prepare hierarchically arranged micro/nanostructures wrinkled nanoporous gold (WNPG) films, which involves laminating dealloyed Au film on heat-shrinkable shape-memory polymer and geometrical modulation As result, various types WNPG films are crafted remarkable density cracks structured surface area. Specifically, consisting multilayered overlapping features explored used as This dual porosity coupled localized plasmon resonance estimated numerical simulation suitable model found core mechanism enhancement SERS sensitivity, quantitatively characterizes “hot spots” interlayers. These suggested characteristic fully assessed applying series dye molecules DNA strands prepared substrate, demonstrating enhanced intensity signals optimized surface.