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

1
Plasma, Laser and Applications Research Group, Basic Science Department, Technological University of Pereira, A.A. 097, Pereira 660003, Colombia
2
Coordination and Organometallic Applied to Molecular Materials, Chemistry Department, Technological University of Pereira, A.A. 097, Pereira 660003, Colombia
*
Author to whom correspondence should be addressed.
Colloids Interfaces 2019, 3(1), 25; https://doi.org/10.3390/colloids3010025
Received: 10 January 2019 / Revised: 29 January 2019 / Accepted: 31 January 2019 / Published: 4 February 2019
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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. View Full-Text
Keywords: metal nanoparticles; laser ablation; antibacterial effect; localized surface plasmon reference LSPR metal nanoparticles; laser ablation; antibacterial effect; localized surface plasmon reference LSPR
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Duque, J.S.; Madrigal, B.M.; Riascos, H.; Avila, Y.P. Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test. Colloids Interfaces 2019, 3, 25.

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