Gas-phase engineered gold-on-paper SERS substrates for quantitative thiabendazole sensing in real matrices

Darwish, Maher and Horváth, Viktória and Mohammad, Hanan and Katona, Gábor and Kopniczky, Judit and Geretovszky, Zsolt and Kohut, Attila (2026) Gas-phase engineered gold-on-paper SERS substrates for quantitative thiabendazole sensing in real matrices. MICROCHIMICA ACTA, 193 (7). No. 505. ISSN 0026-3672

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Abstract

A three-dimensional (3D) Au nanoparticles (AuNPs)-cellulose interface was engineered via solvent-free spark ablation and direct particle deposition onto filter paper, forming a percolated junction network with abundant nanoscale gaps that enables surface-enhanced Raman scattering signal amplification under a fiber-optic probe geometry. The resulting 3D plasmonic network exhibits good signal reproducibility, as verified by Rhodamine 6G mapping (RSD 13.5–16.6%). Using thiabendazole (TBZ) as a representative small-molecule residue, the platform enables quantitative detection down to 0.08 ppm in methanol and 0.10 ppm in untreated apple juice, supporting residue monitoring in real matrices. A nonlinear logarithmic calibration model captures the concentration-dependent response without requiring complex chemometric processing. TBZ-spiked apple juice samples showed satisfactory recoveries of ca. 83–105%, while selectivity against thiram, batch-to-batch repeatability, and intra-/inter-day precision further confirm the analytical robustness of the engineered interface. Overall, the AuNP-cellulose junction network couples interface-driven signal amplification with point-of-need applicability, advancing flexible Raman-based sensing for rapid residue screening in food safety and related chemical/ biosensing scenarios.

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