We demonstrate their application towards detection of an explosive molecule of 2, 4-Dinitrotoluene, DNT (25 µM) using a portable Raman spectrometer (785 nm). The NPs and NSs were achieved by immersing bulk targets with different Au–Ag compositions in acetone followed by ablation. We report results from our studies on the fabrication of bimetallic nanoparticles (NPs) and nanostructures (NSs) using femtosecond (∼50 fs) laser ablation technique. Our detailed investigations revealed that the NPs and NSs of Ag0.65Au0.35 exhibited significant EFs compared to other ratios and pure metals of Ag and Au. The estimated enhancement factors (EFs) from the SERS data were typically >108. Our experimental observations clearly demonstrated that the increment in gold percentage reduced the surface activity of Ag−Au NPs/NSs. Ag−Au NPs and NSs were utilized as surface enhanced Raman scattering (SERS) platforms to detect secondary explosive molecules such as 1,1-diamino-2,2-dinitroethene (FOX-7, 5 μM concentration) and 1- nitro pyrazole (1NPZ, 20 nM concentration). The morphologies of NSs were investigated by the field emission scanning electron microscopy (FESEM) technique. UV−visible extinction spectra of Ag−Au colloids demonstrated the tuning of localized surface plasmon resonance (LSPR) in the spectral range of 406−524 nm. The obtained targets were ablated by ultrafast (∼40 fs) laser pulses in acetone ensuing the fabrication of Ag−Au bimetallic nanoparticles (NPs) and nanostructures (NSs) in a single experiment. Hybrid silver−gold targets were achieved by effortless mixing of pure silver (Ag) and gold (Au) metals at different ratios (Ag0.65Au0.35, Ag0.5Au0.5, and Ag0.35Au0.65) and embracing a manual melting process.
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