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KHALAF AJAJ, MUSHTAQ ABED AL-JUBBORI, and ABDULLAH M. ALI

Synthesis of Silver Nanoparticles via Pulsed-Laser Ablation in Deionized Water: Characterization and Antibacterial Applications
557–568 (2024)

PACS numbers: 68.37.Hk, 68.37.Lp, 68.37.Vj, 78.67.Bf, 81.16.Mk, 87.19.xb, 87.64.Cc

In this present study, the fabrication of silver nanoparticles (NPs) is achieved through Q-switched Nd:YAG-laser ablation. A disc-shaped silver target immersed in deionized water served as the substrate for the ablation process. Varying number of pulses, specifically, 300 and 500 pulses, is used along with two laser fluences of 6.36 J/cm2 and 12.73 J/cm2. To ascertain the nanoparticles’ morphological and optical attributes, UV–Vis spectrophotometry, transmission electron microscopy (TEM) and field-emission scanning electron microscopy (FE-SEM) analyses are employed. The augmentation of absorbance spectra proportional to pulse counts indicates escalated silver-nanoparticles’ concentrations. The absorption spectra exhibit surface-plasmon resonance peaks at~400 nm, which are intensified with increasing laser pulses. An observable decrease in the optical band gap is also noted. TEM and FE-SEM analyses corroborate the existence of nearly spherical Ag nanoparticles. The analyses reveal their average diameters of approximately 34 nm and 57 nm for laser fluences of 6.36 J/cm2 and 12.73 J/cm2, respectively. Intriguingly, the inhibitory effect on Klebsiella pneumoniae and Staphylococcus aureus is more pronounced with Ag NPs generated at lower laser fluence, despite the equivalent pulse number

KEY WORDS: laser ablation, silver nanoparticles, nanoparticle size, antibacterial activity

DOI:  https://doi.org/10.15407/nnn.22.03.557

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