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Spinel-typed ZnFe2O4 nanostructures have attracted much attention owing to their remarkable properties and display promising potential in gas sensors. In this work, spinel ZnFe2O4 compounds with different 3-D sphere-like morphologies, namely faceted microspheres and solid microspheres, were successfully synthesized by employing a facile template-free solvothermal process coupled with a post annealing...