Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test

Abstract

In this article we report the production of metal oxide (TiFe2O4, ZnFe2O4) nanoparticles by pulsed laser ablation technique in a liquid environment. We used nanosecond Nd: YAG laser systems working at 532 nm and 1064 nm of wavelength and the energy of the laser beam was kept constant at 80 mJ. Absorbance spectra, surface plasmon resonance, optical band-gap, and nanoparticle morphology were investigated using ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Changing the wavelength of the laser for growth, nanoparticles showed shift between the absorbance and surface plasmon resonance peaks in their UV-Vis spectra, which implies that the optical properties of the colloid nanoparticles depend on laser parameters. This was confirmed with the variation of the band gap energy. Furthermore, redshift for the absorbance peak was observed for samples as-grown at 532 nm around 150 nm as a function of time preparation. Conversely, for the samples as-grown at 1064 nm there was no shift in the absorbance spectra, which could be due to agglomeration and formation of larger particles. The characterization results showed appropriate plasmonic photo-catalysts properties of the particles, hence the photoactivation of the nanoparticles was examined on antibacterial effect using colonies of Staphylococcus aureus and Escherichia coli.

Moringa oleifera gum based silver and zinc oxide nanoparticles: green synthesis, characterization and their antibacterial potential against MRSA

“…Hydroxyl groups present in the gum Moringa reduced the silver and zinc. Synthesized nanoparticles exhibited absorption band in the range of 220–300 nm, a good Plasmon resonance band (PRB) of silver and Zinc NPs [ 24 ]. Absence of any peak at around 330nm and 550nm confirm the absence of nanoparticles aggregation [ 25 ].…”

A Review on Silver Nanoparticles: Classification, Various Methods of Synthesis, and Their Potential Roles in Biomedical Applications and Water Treatment

“…Laser ablation Spherical 31 [40] Laser ablation Spherical 12-29 [41] Laser ablation Irregular 27-41 [42] Small ceramic heater Spherical 6-21.5 [43] Thermal decomposition Spherical 9.5 [44] Laser ablation Spherical 27-120 [45] Laser ablation Spherical 6.48 [46] Thermal decomposition Spherical 14.4 [47] Laser ablation Spherical 4-18 [48] Laser ablation Spherical 5-13 [49] Laser ablation Spherical 20-51 [50] Thermal decomposition Spherical 4-7 [51,52] Laser ablation Irregular 15-20 [53] Laser ablation Spherical 7.9-16.2 [54] Thermal decomposition Spherical 8 ± 1.3 [55] Thermal decomposition Spherical 3.1-4.5 [56] Thermal decomposition Spherical 40-50 [57]…”

Utilization of Superparamagnetic Iron Oxide Nanoparticles (SPIONs) Impregnated Activated Carbon for Removal of Hexavalent Chromium

“…Figure 1 shows the optical adsorption spectra of synthesized iron oxide nanoparticles at neutral pH. The surface plasmon resonance (SPR) of SPIONs was observed as a broad peak in the UV region (250 nm-300 nm) which signifies the characteristic adsorption spectral range of iron oxide nanoparticles [36]. The adsorption maxima for the synthesized particles were recorded at 294 nm.…”