Abstract
We report the effect of surfactant treatment on the structural and magnetic properties of Mn-doped ZnO bulk (Zn 0.978Mn 0.022O) and Mn- and Li-codoped ZnO nanoparticles (Zn 0.96Mn 0.03Li 0.01O) prepared by low-temperature reaction. X-ray diffraction and transmission electron microscopy analyses of these samples showed the formation of impurity-free crystals with wurtzite ZnO structure. XPS data revealed that Mn exists in the 2+ oxidation state. TEM and HRTEM studies of sodium bis-2-ethylhexyl sulfosuccinate (AOT)-treated Zn 0.978Mn 0.022O showed predominantly rodlike microstructures developing into platelets and sizes in the range of 50-500 nm, whereas the AOT-treated Zn 0.96Mn 0.03Li 0.01O sample showed nearly spherical particles in the nanometer regime (20-30 nm). DC magnetization measurements as a function of field showed enhanced room temperature ferromagnetism for the surfactant-treated Zn 0.978Mn 0.022O and Zn 0.96Mn 0.03Li 0.01O. We discuss the possible role of surfactant and Li ion on the magnetic properties of Mn-doped ZnO.
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