Abstract
In this paper, we report a template-free solvothermal method for the formation of transition-metal-doped zinc oxide spheres and hollow spheres in methanol solvent. The synthesis includes hydrolysis of metal salts, spontaneous aggregation, and localized Ostwald ripening in an alcohol solvent. Electron microscopy observation and X-ray diffraction analysis confirmed that the mesoscale hollow spheres with uniform size and shape, and the highly crystalline structures are finely doped with transition metals such as nickel or cobalt. Magnetic hysteresis loops reveal robust coercivities at 300 K, indicating high-Tc ferromagnetism in the system.
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