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首页> 外文会议>PRICM 7;Pacific Rim International Conference on Advanced Materials and Processing >Shape-Controlled Synthesis and Formation Mechanism of Cobalt Nanopowders by a PVP-Assisted Method
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Shape-Controlled Synthesis and Formation Mechanism of Cobalt Nanopowders by a PVP-Assisted Method

机译：PVP辅助法钴纳米粉的形状控制合成及其形成机理

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摘要

Three different kinds of morphologies including spherical, chainlike and wirelike cobalt nanopowders, have been synthesized by chemical reduction of coblat chloride solution with hydrazine hydrate in basic solution. The products were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). It was revealed that the morphologies of the nanopowders depend on the concentration of Co~(2+) and the way of adding reducing agent (hydrazine hydrate). These two features affected the nucleation sites and the number of nucleuses. When the concentration of Co~(2+) was low, nucleuses formed in the soft template, while the reducing of the reducing agent added drop wise, a little number of nucleuses was formed. Based on that, a mechanism of formation, as a basis of gram-scale syntheses, was proposed.
机译：通过在碱性溶液中用水合肼化学还原氯化钴溶液，合成了球形，链状和线状钴纳米粉三种不同的形貌。通过X射线衍射（XRD）和场发射扫描电子显微镜（FESEM）对产物进行表征。结果表明，纳米粉体的形貌取决于Co〜（2+）的浓度和还原剂（水合肼）的添加方式。这两个特征影响成核位置和核数目。当Co〜（2+）的浓度低时，在软模板中形成核，而逐滴添加的还原剂的还原时，形成少量核。在此基础上，提出了一种形成机制，作为克级合成的基础。

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