Dopant induced changes in physical properties of ZnO:Mg ‎nanosuspensions: study of antibacterial activity


1 ‎Department of physics, Ferdowsi University of Mashhad, Mashhad, Iran

2 Department of physics, Ferdowsi University of Mashhad, Mashhad, Iran

3 Nanoresearch Center, Fedrowsi University of Mashha,, Mashhad ,Iran


Sol-gel method is successfully used for synthesis of ZnO nanoparticles doped with different concentrations of Mg. The structure, morphology, chemical composition, optical and antibacterial activity of the nanoparticles were studied as a function of the Mg doping concentration. The synthesized ZnO samples show hexagonal Wurtzite structure, and the phase segregation takes place for 15% amount of doping.TEM images verifies the formation of nanoparticles in the range of 30-55 nm. FTIR and EDS results also confirm the successful incorporation of Mg in ZnO structure. Optical investigation indicates the increase in band gap energy with increase of doping content. The antibacterial activities of the nanosuspensions were tested against Escherichia Coli (Gram negative) and Streptococcus Mutans (Gram Positive) cultures. ZnO:Mg nanosuspension shows high antibacterial activity which slightly decreases with the amount of Mg .