Journal
HELIYON
Volume 5, Issue 3, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.heliyon.2019.e01333
Keywords
Materials science; Nanotechnology; Materials chemistry; Pharmaceutical science
Categories
Funding
- South African Research Chairs Initiative of the Department of Science and Technology
- National Research Foundation of South Africa [84415, 93214]
- Romania/South Africa research collaboration program [104027]
- University of the Free State
- Competitiveness Operational Program 2014-2020, ANCSI/MFE [MIFID ID P_39_366 Cod My SMIS 104809]
- INFLPR Program NUCLEU
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Oxide materials (ZnO, TiO2) doped with noble metals were synthesized using the combustion technique. The results of the addition of Ag, Au, and Pd up to a concentration of 2 mol% on the structural, optical, morphological and antimicrobial properties was considered. X-ray diffraction experiments revealed that the crystal structure of the host materials remained unaltered despite doping with noble metals. From the scanning electron microscopy results, it was evident that the doped nanoparticles aggregated in clusters of different sizes in the host matrix. The plasmonic effect was also observed in the absorbance spectra of the different doped materials. The obtained materials have shown promising antimicrobial features. All ZnO materials exhibited a high antimicrobial activity, with very low minimum inhibitory concentration values, against the planktonic growth of all tested Gram-positive and Gram-negative bacterial strains. All doped materials exhibited very good anti-biofilm activity, the lowest minimal biofilm eradication concentration values being registered for ZnO doped with Au and Pd toward Escherichia coli and for ZnO doped with Ag against Candida albicans. These results indicate the potential that these materials have for antimicrobial applications in the fields of biomedicine and environmental protection.
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