首页|Hypersensitive SERS sensor of various types of herbicide enabled by tri elements surface alloying nanoparticles
Hypersensitive SERS sensor of various types of herbicide enabled by tri elements surface alloying nanoparticles
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NETL
NSTL
Springer Nature
Herein, a specific type of tri_elements SERS chemical sensor was created by the ion reduction process of the as-prepared porous silicon (PSi) substrate in a mixed solution of volumetric ratio (1:1:1) of metal solutions of gold, silver, and palladium of concentrations of 1 mM. The synthesized tri_elements SERS chemical sensor effectively detected two types of herbicide, atrazine and diuron, at ultra-low concentrations, less than the maximum amount permitted globally. The as-prepared porous Si was created via laser-stimulate etching (LSE) process by (60 mW/cm~2) laser power density, (5 mA/cm~2) current density, and (12 min) etching time. The created tri_elements SERS chemical sensor was inspected at various herbicide concentrations from 5 × 10~(-5) to 5 × 10~(-8) M. The results of the fabricated tri_elements sensor with a cauliflower-shaped surface alloy configuration showed an excellent Raman enhancement factor of about 4.2 × 10~6 and 4 × 10~6 with the lowest detection limit of about 3 × 10~(-11) M and (2 × 10~(-11) M) and an excellent reproducibility of minimum variation of about 2.9% and 3.1% for diuron and atrazine respectively. The density of hot spot sites and the aggregated tri-metallic nanoparticles' size and shape are the leading causes of the sensors' hypersensitivity.
Tri_elementsSERS sensorLaser IntensityPorous Si
Rasha B. Rashid、Alwan M. Alwan、Mehdi Q. Zayer
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General Directorate of Vocational Education, Ministry of Education, Baghdad, Iraq
Department of Applied Sciences, University of Technology, Baghdad, Iraq
NETL
NSTL
Springer Nature
