Mn-doped ZnO nanoparticles: Preparation, characterization, and calculation of electronic and magnetic properties

► Zn1−xMnxO nanoparticles were prepared by PEG sol-gel. ► The nanoparticles were investigated by using TEM. ► It has been theoretically investigated by first principle. ► The Mn-doped ZnO shows ferromagnetism. ► It has an intermediate band when doped with Mn.