20.500.12556/DiRROS-23631 Plasma-tunable metasurfaces for SERS nanosensing of hazardous chemicals The demand for rapid, field-deployable detection of hazardous substances has intensified the search for plasmonic sensors with both high sensitivity and fabrication simplicity. Conventional approaches to plasmonic substrates, however, often rely on lithographic precision or complex chemistries limiting scalability and reproducibility. Here, a facile, one-step synthesis of vertically aligned 2D nanosheets composed of intergrown Cu2O/CuO crystallites is presented, fabricated via oxygen plasma discharge on copper substrates. Decorated with a discontinuous Ag nanoparticle layer, the substrates serve as high-performance plasmonic metasurface exhibiting nanomolar sensitivity of explosive molecules, with detection limits as low as 4–5 nm for tetryl and 2–3 nm for HMX under 488 nm excitation. Importantly, the SERS (Surface enhanced Raman scattering) activity expands into a broad spectral range (488, 535, 633 nm), enabled by the formation of plasmonic “hotspots” network within nanoparticle gaps, crevices, that cumulatively boost SERS signal. A pronounced red-shift in the symmetric NO2 stretching mode of tetryl is further demonstrated, attributed to LUMO-mediated charge transfer from the Ag Fermi level—highlighting the need for laser- and substrate-sensitive interpretation of vibrational data. Together, these findings advance the rational design of low-cost, reproducible SERS substrates for trace chemical detection, with potential for integration into autonomous sensing platforms. plasmonic sensors surface enhanced Raman scattering true false true Wiley ZDA Angleški jezik Ni določen © 2025 The Author(s). Neznano 2025-09-16 09:36:36 2025-09-16 09:36:37 2025-10-24 03:54:42 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Soavtorji iz Slovenije: Damjan Vengust, Janez Zavašnik, Uroš Cvelbar; Opis vira z dne 16. 9. 2025; str. 1-12 iss. , [article no.] e06814 Vol. 21 [in press] 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-06-06 0000-00-00 2025-09-10 620.1/.2 1613-6829 10.1002/smll.202506814 249057539 https://onlinelibrary.wiley.com/doi/10.1002/smll.202506814 1 e191e24e-92cf-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34966 RAZ_Shvalya_Vasyl_2025.pdf RAZ_Shvalya_Vasyl_2025.pdf 1 09732DE15EE51C420204BA8FAB5F73C9 ac448af7273fb2741e7b7214db4bc5c94f18820813bca796f038692860892237 55e6c1ee-92d0-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34968 Institut Jožef Stefan 0 0 0