Surface-enhanced Raman spectroscopy of Omethoate adsorbed on silver surface

Silver‐based surface enhanced Raman spectroscopy devices for detection of organophosphorus pesticides traces

“…The optimization in the sensitivity degree of SERS‐active nanostructures is typically focused on modifications in its shape, size, composition, and aggregation level. Different methods of preparation consider reducing agents such as sodium citrate, the irradiation with UV–Vis light, sodium borohydride (NaBH 4 ), formic acid, sodium citrate and NaBH4, butylamine, agarose, ascorbic acid, ethylene glycol, ammonia, polyvinyl(pyrrolidone)—PVP, sodium citrate, and ascorbic acid . Table summarizes different Ag‐based SERS systems and the influence of reducing agents on detection level of different pesticides.…”

“…In addition to the size and aggregation level of nanoparticles, different parameters are relevant in the optimization of pesticides detection process, such as solution pH, solvent type, and density of AgNPs …”

“…Kim et al, Xie et al, and Zhang et al reported that Raman peaks are sensitive to changes in pH. Based on this information, the detection of the ethion was evaluated at intermediate pH values, more precisely for pH values in the range of 6.66–11.11 .…”

“…Cai et al 62 reported the combined use of NaBH 4 and sodium citrate deposited on a nonwoven fabric by self-assembly or in situ growing approach, that resulted in the optimization of the amount and distribution of Ag NPs on fiber surface. Jiang Kim et al, 58 Xie et al, 54 and Zhang et al 66 reported that Raman peaks are sensitive to changes in pH. Based on this information, the detection of the ethion was evaluated at intermediate pH values, more precisely for pH values in the range of 6.66-11.11.…”

“…Substrate of AgNPs with SERS for organophosphorus pesticides detection al63 reported an alternative for interaction of AgNPs with negatively charged groups of the graphene oxide layers, facilitating the nucleation and growth of AgNPs for detection of paraoxon in the range of 10 −3 -10 −7 M, with limit of detection of 10 −6 M. Based on the combination of ascorbic acid and sodium citrate, it is reported the production of floriated Ag nanoplates that exhibit efficient enhancement due to the presence of a high density of hot spots and a large flat surface area for adsorption of methyl parathion 68. 2.5.7 | Influence of solvent, pH, and density of hot spots on SERS signalIn addition to the size and aggregation level of nanoparticles, different parameters are relevant in the optimization of pesticides detection process, such as solution pH, solvent type, and density of AgNPs 54,58,66. These parameters are relevant if applied in the control of nanoparticles density, that interferes on SERS detection,52,54,57,63 in consequence of AgNPs aggregation 52.…”