Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10714500 | Physica B: Condensed Matter | 2019 | 41 Pages |
Abstract
The present work explores the differences in the various properties of Mn doped ZnO nanocrystals when the sizes of the doped nanocrystals are significantly different. Mn doped ZnO nanocrystals of sizes â20â¯nm and â5â¯nm were synthesized by the chemical co-precipitation method. The targeted Mn doping concentrations were 2%, 6% and 10% (atomic), however, the observed doping concentrations were low (â0.5%, â1% and â2%). The microstructural, morphological, optical and magnetic properties as well as the photocatalytic activities of the nanocrystals were investigated. The variations of the lattice strain and lattice volume with increasing Mn concentrations were found to be correlated. The un-doped and Mn doped ZnO nanocrystals were found to be ferromagnetic at room temperature. Variation of band gap with increasing Mn concentrations was observed. Significant/insignificant quenching of the photoluminescence emissions was observed for sizes â20 nm/â 5â¯nm after doping. The saturation magnetization was found to depend on the Mn concentrations as well as on the nanocrystal sizes. Agglomerated Mn2+ resulted in a decrease in saturation magnetization of the â2% Mn doped nanocrystals of sizes â5â¯nm. Correlation between the photoluminescence properties and photocatalytic activities was observed.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Amarjyoti Kalita, Manos P.C. Kalita,