Capillarity-constructed reversible hot spots for molecular trapping inside silver nanorod arrays light up ultrahigh SERS enhancement

摘要: SERS hot spots with outstanding enhancement ability can spontaneously form in a reversible and reproducible way by the self-approach of flexible silver nanorods driven capillary force solvent evaporation, at same time target analytes be trapped top-closed evaporation process. The Raman intensity vs. top-opened nanorod arrays was factor 100–1000 higher for reporters such as p-aminothiophenol or crystal violet. Furthermore, triplicate measurements on long position show variation <10%, demonstrating good reproducibility enhancement. Moreover, we found that is highly dependent length molecules different adsorptivity have performance This evaporation-controlled an extremely simple efficient strategy spontaneous formation ability. These characteristics promise generic platform molecule trapping sensing high sensitivity reproducibility, which help to transform into practical analytical technique.