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Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

1
Faculty of Chemical Technology, Hanoi University of Industry, BacTu Liem, Hanoi 100000, Vietnam
2
Institute for Tropical Technology, Vietnam Academy of Science and Technology, Hanoi 122100, Vietnam
3
Hanvet Pharmaceutical and Veterinary Materials JSC, Hungyen17000, Vietnam
4
Department of Chemistry, University of Montreal, Montreal, QC H3T 1J4, Canada
*
Author to whom correspondence should be addressed.
Département de chimie, biochimie et physique, Université du Québec à Trois-Rivières, Trois-Rivières, QC G8Z 4M3, Canada.
J. Compos. Sci. 2019, 3(2), 61; https://doi.org/10.3390/jcs3020061
Received: 23 May 2019 / Revised: 7 June 2019 / Accepted: 9 June 2019 / Published: 17 June 2019
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Abstract

This work emphasizes the use of the silver decorative method to enhance the antibacterial activity of TiO2 and ZnO nanoparticles. These silver-decorated nanoparticles (hybrid nanoparticles) were synthesized using sodium borohydride as a reducing agent, with the weight ratio of Ag precursors/oxide nanoparticles = 1:30. The morphology and optical properties of these hybrid nanoparticles were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD) patterns, and UV-Vis spectroscopy. The agar-well diffusion method was used to evaluate their antibacterial activity against both Staphylococcus aureus and Escherichia coli bacteria, with or without light irradiation. The TEM images indicated clearly that silver nanoparticles (AgNPs, 5–10 nm) were well deposited on the surface of nano-TiO2 particles (30–60 nm). In addition to this, bigger AgNPs (<20 nm) were dispersed on the surface of nano-ZnO particles (30–50 nm). XRD patterns confirmed the presence of AgNPs in both Ag-decorated TiO2 and Ag-decorated ZnO nanoparticles. UV-Vis spectra confirmed that the hybridization of Ag and oxide nanoparticles led to a shift in the absorption edge of oxide nanoparticles to the lower energy region (visible region). The antibacterial tests indicated that both oxide pure nanoparticles did not exhibit inhibitory effects against bacteria, with or without light irradiation. However, the presence of AgNPs in their hybrids, even at low content (<40 mg/mL), leads to a good antibacterial activity, and higher inhibition zones under light irradiation as compared to those in dark were observed. View Full-Text
Keywords: silver nanoparticles; nano-TiO2; nano- ZnO; nanohybrids; antibacterial silver nanoparticles; nano-TiO2; nano- ZnO; nanohybrids; antibacterial
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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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Nguyen, V.T.; Vu, V.T.; Nguyen, T.H.; Nguyen, T.A.; Tran, V.K.; Nguyen-Tri, P. Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles. J. Compos. Sci. 2019, 3, 61.

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