Flexible Surface‐Enhanced Raman Scattering Tapes Based on Plasmonic Ag Decahedral Nanoparticle Monolayers for In Situ Thiram Residues Detection

Pesticide residue detection is vital for ensuring food and environmental safety. However, conventional analytical methods often require complex, time‐consuming, and costly sample pretreatment. In this study, we developed a method for fabricating flexible surface‐enhanced Raman scattering (SERS) tapes by decorating commercial transparent adhesive tapes with monolayer films of silver decahedral nanoparticles (AgDeNPs). This flexible SERS tape enables efficient and in situ detection of thiram residues on fruit surfaces. Size‐optimized AgDeNPs were assembled into monolayers and transferred onto the tape using a “paste‐peel” method, resulting in uniform SERS enhancement over a large area. The transparency of the tape allows SERS measurements from both sides, achieving a detection limit as low as 10 ⁻⁸ M for 4‐mercaptobenzoic acid (4‐MBA). To demonstrate practical applicability, the SERS tape was applied directly to the surface of an apple for in situ analysis of thiram residues. A detection limit of 0.001 mg/L was achieved for thiram, with recovery rates ranging from 97.24% to 99.51%. This flexible, sensitive, and uniform SERS platform offers a promising strategy for rapid, in situ detection of pesticide residues on complex surfaces.