Influence of Ag, Au and Pd noble metals doping on structural, optical and antimicrobial properties of zinc oxide and titanium dioxide nanomaterials

Abstract

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.

Antibacterial Shoe Insole-Coated CuO-ZnO Nanocomposite Synthesized by the Sol-Gel Technique

“…With low concentration, zinc oxide nanoparticles also show their antibacterial and antifungal activities and the antifungal activity does not influence soil fertility as some conventional antifungal agents [15]. Besides, the electronic, magnetic, optical, and electrical characterization of ZnO can be changed and be useful for various practical applications; some transition metals (Cu, Ni, Co, Pd, Au, and Ag) are doped in its structure [16][17][18][19]. Compared to pure ZnO, metal-or metal oxide-doped ZnO demonstrates a greater effect against pathogenic organisms in this method using nanoparticle material as an antimicrobial agent and is considered one of the most useful techniques to minimize the cost and chemical waste [20].…”

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

“…In this respect, doping TiO 2 with noble metals seems a virtuous idea in achieving visible light active photocatalyst, and solving the recombination of the electron-hole pair, already mentioned above (Zhao et al 2016;Endo et al 2018;Pathak et al 2019). To the best of our knowledge, the first publication concerning doping TiO 2 with noble metals was reported in 1978 by Tauster et al (1978).…”

The Antibiofilm Effect of a Medical Device Containing TIAB on Microorganisms Associated with Surgical Site Infection

“…The MD showed antimicrobial and antibiofilm activities versus S. aureus and E. faecalis , but a lower efficacy against E. coli . The antimicrobial activity is definitely due to the silver-based component (TIAB), because the antibacterial activity exerted by silver ions as well as by TiO 2 nanoparticles has long been known [13,23]. TIAB can be used as an effective topic therapeutic agent in the treatment of chronic periodontitis along with supportive periodontal therapy and after ocular surgery.…”

“…Other researchers showed that TiO 2 microspheres combined with Ag particles possess antimicrobial properties, particularly versus S. aureus and E. coli , suggesting an application in dentistry, orthopedics, and other field of medicine [11,12]. However, TiO 2 as well as ZnO nanomaterials are the most studied for their activity not only toward bacterial infections, but also toward viral, fungal, and protozoal infections [13]. The antimicrobial activity is performed through the induction of the production of reactive oxygen species (ROS), which damage the cellular membrane and cause the peroxidation of proteins and lipids.…”