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Pulsed laser ablation in liquid (PLAL) of metallic magnesium was used in this work to manufacture magnesium nanoparticles with varying average sizes (10–90nm). (2.07–3.44) $\times$ 10⁸W/cm² of laser intensity and pulse rates of 100 pulses were used to create the nanoparticles. Laser power increased the number of nanoparticles in magnesium oxide (MgO) at 204nm absorption spectroscopic absorbance linearly. When the UV–Vis absorbance of nanoparticles rose, so did their colloidal density (measured in mg/mL). Nanoparticles are more likely to be produced at higher laser scanning rates: UV–Vis absorbance and nanoparticle diameters. Field emission scanning electron microscopy (FESEM) revealed that nanoparticles created dendritic patterns when put upon metal foil. The nanoparticles were measured using dynamic light scattering. When MgO particles were used in antibacterial activity against (in vitro) various gram-positive and gram-negative strains of bacteria, they had a demonstrable impact on some strains of bacteria. MgO has been shown to have antibacterial properties.

In this research, metal targets dipped in 3 mL of distilled water (DW) were subjected to pulsed laser ablation. Colloidal dispersions of Fe and Au, and bimetallic Fe@Au core/shell nanoparticles are created. The core/shell structure of these particles was subsequently studied using X-ray diffraction. UV–Vis and HRTEM measurements are used to determine surface Plasmon resonance (SPR) and particle sizes. We also carried out an investigation to gauge the stability in terms of the surface charge of the produced nanoparticles (Zeta-potential). The findings show that maximum absorption value of Fe Nps was 0.45 in the range (200–350) nm, while Au exhibits a surface Plasmon resonance (SPR) peaked at a wavelength of 545 nm in the range (290–1100) nm. Another peak was noticed at (555) nm for the surface Plasmon band of the particles Fe@Au in the range (290–1100) nm, HRTEM measurement was used to check the shape and particle size, and the results showed that the average particle size was less than 50 nm.