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Co submicrospheres with the typical diameter of ca. 500nm, and possessing beautiful morphologies composed of dense Co nanosheets ca. 10nm thick, were synthesized by a facile and low-cost complexant-assisted hydrothermal approach. Magnetic measurement at room temperature indicated the coercivity of the submicrospheres reached 268Oe, which was much higher than that of bulk Co and of some microstructure...