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SERS, owning to it advantageous combination of ultra-sensitivity, high speed, low costs, multiplexing capability, and portability, may be a key method for explosives detection. The core of the SERS-based detection is the SERS-substrate – a specially designed nanostructured surface of noble metal, with a large number of “hot spots” – places nigh local concentration of electric field, generated by laser excitation.
In this work, we synthesized Au and Ag nanoparticles of different shapes (spherical, cubic, elliptical etc) and sizes (10-60nm). Sizes and shapes of investigated NPs were confirmed by DLS and SEM measurements. From optical absorption spectra were determined surface plasmon resonances for both Au and Ag NPs. For SERS detection of nitro group compounds we used two approaches: (1) mixing those NPs with analytes in solution and (2) drop-casting with following drying of NPs on Si substrate and then drop-casting analytes on formed structure of NPs. SERS spectra were measured from both drop and dried samples in both two approaches. As nitro group compounds we investigated were the next analytes (explosive analogues): 4-nitrophenol, 1-nitronaphthalene, 5-nitroisoquinoline, picric acid - 2, 4, 6-trinitrophenol. We were able to detect all analytes with concentrations down to 10-6M both dropped on our SERS substrates and mixed with NPs.
This work was funded by grant of the NAS of Ukraine to research laboratories/groups of young scientists № 06/01-2025(5).
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