Abstract
In this paper, three distinct types of nano and tri_metallic SERS plasmonics sensors were configured, depending on their mixing volumetric ratio of metal solutions. Au, Ag, and Pd of fixed concentrations of 2 mM were mixed following the volumetric ratios, (1:1:1), (2:2:1) and (1:2:2), respectively, to synthesize the required ion reduction solutions necessary for the formation of tri_metallic nanoparticles. A meso porous silicon substrates (meso Psi) were dipped in each solution to produce plasmonics sensors. Bare (meso Psi) were synthesized by laser-supporting etching (LSE) method using (40 mW/cm2) laser illumination intensity, (10 mA/cm2) etching current density, and (10 min) etching period. The synthesized plasmonics sensors Au: Ag: Pd nanoparticles / meso Psi were examined at different concentrations of chlorpyrifos from 2 × 10–7 M to 2 × 10–9 M. The synthesised sensors showed strong dependence on nanoparticle sizes, population of hot spot regions, and surface density of tri_metallic nanoparticles. Higher (EF), lower (LOD) and high degree of reproducibility with minimum variation of 1 × 108, 10–13 M and 3.6% correspondingly was realized from the sensor which prepared using solution of volumetric ratio (2:2:1), due to the extra ordinary specific surface area. These high surface density of tri_metallic nanoparticles and hot spot regions provided a very high energy transfer efficiency from the nanoparticles to the pesticides molecules. The control of the volumetric ratios of tri_metallic ionic solutions was an effective and easy-to-implement path for improving the performance of plasmonics sensors to detect chlorpyrifos concentrations less than the internationally permissible limit.
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Hind Kh. Abbas, Alwan M. Alwan wrote the main manuscript text. Hind Kh. Abbas, Alwan M. Alwan prepared figures. Alwan M. Alwan devised the idea and helped while preparing and supervising the final draft. All authors reviewed the manuscript.
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Abbas, H.K., Safari, E. & Alwan, A.M. Improved the performance of tri_metallic plasmonics SERS sensors by controlling the metals ratio. J Mater Sci: Mater Electron 35, 658 (2024). https://doi.org/10.1007/s10854-024-12343-8
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DOI: https://doi.org/10.1007/s10854-024-12343-8