Аннотация:Modern public safety challenges require the development of compact and highly sensitive sensors for the rapid detection of trace amounts of hazardous substances. In this study, we present sensor substrates based on arrays of silicon nanowires modified with gold and silver nanoparticles (AuAg@SiNWs), designed for the detection of 5-hydroxytryptamine (5-HT) and 2,4-dinitrotoluene (2,4-DNT) as a model substances via surface-enhanced Raman scattering (SERS) spectroscopy. The substrates were fabricated using metal-assisted chemical etching of crystalline silicon followed by deposition of noble metals. We demonstrate the possibility of recording the spectra of the target substances directly from human fingerprints (Fig. 1). Fig. 1. Schematic representation of the procedure for applying sequential fingerprints on sensor substrates and recording the SERS signal from traces of molecules on the surface of AuAg@SiNWs.It was found that the spectral signals remain detectable for up to four sequential fingerprints in the case of 2,4-DNT and up to two for 5-HT, without significant loss of intensity. These results confirm the potential of the developed AuAg@SiNWs substrates as compact, low-cost, and sensitive sensors for rapid on-site (in situ) analysis, including security screening at transportation hubs and in public facilities.The study was supported by the Russian Science Foundation, grant No. 24-15-00137, https://rscf.ru/project/24-15-00137/
