Citation: GUAN Ming-Yun, JIAN Yan, SUN Jian-Hua, XU Zheng. Flower-Like Mesocrystal Cobalt: Controllable Synthesis in Large Scale and Magnetic Property[J]. Chinese Journal of Inorganic Chemistry, ;2015, (3): 619-626. doi: 10.11862/CJIC.2015.084
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Using diethylenetriamine (DETA) as coordination agent, a well-defined flower-like cobalt mesocrystal was synthesized rapidly by nanoparticles self assembly in oriented fashion. By adjusting reaction rate and kind of coordination agents, morphologies of cobalt can be transformed from nice-look flower, via poor-look dendrite, to microsphere composed of nanoparticles or nanoplates. DETA plays an important role in the formation process of cobalt mesocrystal. The possible formation mechanism is proposed. The cobalt mesocrystals not only exhibit Co nanocrystals property (an enhanced coercive force being 260 Oe at 300 K), but also have bulk Co property (saturation magnetization being 168 emu·g-1). The synthesis method in large scale is facile and effective with high yield.
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