Abstract— This study deals with the use of laser techniques for preparation of advanced Au and Ag nanostructures on SiO2 (001) substrates to be applied to high-resolution analyses, namely, surface enhanced Raman spectroscopy (SERS) analyses. The optical and morphological properties of the nanostructures are compared with those of the PLD thin films. The activity is tested of the structures fabricated as substrates for SERS covered by small quantities (usually applied in agricultural medicine) of the Aktara 25 BG (thiamethoxam) insecticide and the Dithane DG (mancozeb) fungicide. To the best of our knowledge, Raman spectra of Aktara 25 BG are presented for the first time. The study has a direct bearing on the human health and food quality by way of assisting the detection of small amounts or residue of harmful pollutants.
Keywords— laser deposition and annealing, Ag and Au nanostructures, SERS, insecticide Aktara 25 BG, fungicide Dithane DG.
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