The Role of Porosity in SERS

Abstract Porosity serves as a critical design parameter in advancing surface‐enhanced Raman scattering (SERS) spectroscopy by simultaneously addressing two fundamental challenges: analyte concentration and electromagnetic field enhancement. This review systematically examines how precisely engineered porous architectures including intrinsic nanoporous metals, functional polymer matrices, mesoporous silica hybrids, and crystalline metal‐organic frameworks (MOFs), create synergistic platforms that significantly boost SERS performance. The unique pore structures of these materials provide three key advantages: 1) enhanced molecular enrichment near plasmonic surfaces through size‐selective trapping, 2) increased density of electromagnetic hotspots via nanoscale cavity engineering, and 3) improved substrate stability and reusability.