Abstract
Conventional surface-enhanced Raman scattering (SERS) substrates are usually performed by Ag-or-Au metal nanoparticles (Ag,Au-MNPs) in suspension-or-solid substrates. The SERS mechanism is widely explained by the hot spots and shape of Ag,Au-MNPs. Here, the facile one-step irregular-nanopore anodic aluminum oxide (AAO) with platinum-metal-film (Pt-MF) coating as the new SERS substrate is proposed. A novel SERS mechanism based on the irregular Pore Peripheral Plasmonic Mechanism (3PM) of MF-AAO is interpreted. COMSOL® simulation shows the pore peripheral of AAO may gather a strong electric field for enhancing Raman signal. The irregular pores formed in the as-prepared one-step AAO and followed by pore-widening etching can generate additional hot spots at the small interpore gap and high-curvature tips for further enhancing SERS analytical enhancement factor (AEF). Using methylene blue (MB) as a probe molecule that was generally used to practically detect industry-pollution S2- and to sanitize water for fish health, the Pt-MF-AAO SERS substrate can reach a high AEF up to 1.88 × 105, and low limit of detection (LOD) of 1 × 10−9 M. A good linearity (R2 of 0.9406) between the MB concentration and Raman intensity is achieved. The large-area (several cm2) uniformity of is good with relative standard deviation (RSD) of 7.14%.
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