【摘要】 以二乙烯三胺(DETA)作为配位剂,快速合成了纳米粒子定向组装构成的类似花状的介晶钴。通过控制反应的速率和配位剂的种类,依次获得了精美的钴花、差形貌的枝晶、由纳米粒子或纳米片构成的微球。配位剂在介晶钴的形成过程中起了很重要的作用。探讨了介晶钴花的形成机理。介晶钴不但具有钴纳米晶的性能(在300 K时矫顽力260 Oe),而且拥有块体钴的性能(饱和磁化强度168 emu·g-1)。合成方法简便、有效且具有较高的产率。更多还原

【Abstract】 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.更多还原