Effect of Mn doping on the structural, optical, magnetic properties, and antibacterial activity of ZnO nanospheres

Abstract

In this work, a systematic study of structural, optical, magnetic and antibacterial properties of Mn doped ZnO has been investigated. Zinc oxide (ZnO) and Mn 2+ doped zinc oxide (ZnMnO) nanoparticles (NPs) were prepared through co-precipitation method. The X-ray diffraction studies confirmed that the synthesize nanoparticles did not modify the crystal structure upon Mn doping, but the microstructural parameters were changed considerably while increasing the concentration of Mn dopant. The HRTEM images showed that the ZnO NPs were exhibited nanospheres like morphology and a reduction in the average particle size from 41 nm to 33 nm were observed upon Mn 2+ doping. The elemental composition of Zn, Mn and O atoms were identified by EDAX spectra. The Zn-O stretching bands were observed at 539 and 525cm -1 in the FTIR spectra and, the zinc and oxygen vacancies defects were confirmed by PL spectra. From the UV-Vis spectra, the band gap was estimated as 2.7 eV for pure and 2.9 eV for Mn doped ZnO NPs. The Mn doped ZnO NPs showed greater antibacterial effect than the pure ZnO NPs. The magnetization measurements for Mn doped ZnO samples under room temperature ferromagnetism (RTFM) showed the ferromagnetic phase that could originated from the interactions between Mn 2+ ions and oxygen vacancies and the defects incorporated in the ZnO matrix.

Functionalized ZnO-Based Nanocomposites for Diverse Biological Applications: Current Trends and Future Perspectives

“…Jeyasingh et al [ 103 ] employed the controlled precipitation method to synthesize ZnO nanoparticles. The researchers utilized zinc acetate dihydrate, sodium hydroxide, and sodium chloride as precursors.…”

“…Surface doping with manganese has also been tested and resulted in enhanced bactericidal properties. The one-pot co-precipitation method that was used resulted in similar crystalline structures as the pure nanoparticles [ 103 ]. Likewise, a thin polymer film was created by anchoring folic acid doped-ZnO nanoparticles into poly(vinyl alcohol).…”

Improvement of the photocatalytic activity of ZnO thin films doped with manganese

“…Furthermore, the ion Mn(II) radius is smaller than that of Zn(II), making the doping process easier. Mn-doped ZnO has been successfully prepared by different techniques (e.g., RF Magnetron sputtering [ 38 ], solution combustion technique [ 39 ], sol-gel [ 40 ], ultrasonic spray pyrolysis [ 41 ], spray pyrolysis [ 42 ] and co-precipitation [ 43 ]). Among these synthesis procedures, the sol-gel method at low temperatures is very attractive because it is inexpensive, and its implementation does not demand difficult experimental conditions as physical methods do [ 44 ].…”