Architectural Processes and Physicochemical Properties of CoO/ZnO and Zn1−xCoxO/Co1−yZnyO Nanocomposites
Architectural Processes and Physicochemical Properties of CoO/ZnO and Zn1−xCoxO/Co1−yZnyO Nanocomposites
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DOI：
10.1021/jp8093325
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发表时间：
2009-01
影响因子：
3.7
通讯作者：
K. Yao;H. Zeng
中科院分区：
文献类型：
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作者：
K. Yao;H. Zeng
在这项工作中，我们合成了两种相反的钴和锌氧化物纳米复合材料（CoO/ZnO和Zn 1 −xCoxO/Co 1 −yZnyO），并比较了从合成中观察到的方法学特征。本文选择二元氧化物体系是因为二价钴和锌具有非常相似的离子半径，并且它们在形成掺杂结构时容易相互扩散。设计了一种“两锅法”制备CoO/ZnO复合材料的方法，首先制备CoO的介晶核心，然后在核心表面包覆一层ZnO纳米颗粒。相比之下，一个“一锅法”的过程中开发的Zn 1 −xCoxO/Co 1 −yZnyO复合材料。特别是，中空和/或多壳的Zn 1 −xCoxO核（纤锌矿相）在后一种方法中充当Co 1 −yZnyO纳米球（岩盐相）的载体。我们的研究结果表明，虽然“多锅”合成是一种流行的方法，复合纳米粒子，更简单的“一锅”合成可以是一种有效的方法，用于制备更复杂的纳米复合材料。
In this work we synthesized two inverse kinds of cobalt and zinc oxide nanocomposites (CoO/ZnO and Zn1−xCoxO/Co1−yZnyO) and compared methodologistic features observed from the syntheses. The binary oxide system chosen herein is because divalent cobalt and zinc have very similar ion radii, and they interdiffuse easily when forming doped structures. A “two-pot” process was devised for the CoO/ZnO composites, in which mesocrystalline cores of CoO were formed first, followed by introduction of an overlayer of ZnO nanoparticles to the core surfaces. In contrast, a “one-pot” process was developed for the Zn1−xCoxO/Co1−yZnyO composites. In particular, hollow and/or multishelled Zn1−xCoxO cores (in wurtzite phase) serve as a support for the nanospheres of Co1−yZnyO (in rock-salt phase) in this latter method. Our findings indicate that while “multi-pot” synthesis is a prevailing methodology for composite nanoparticles, simpler “one-pot” synthesis can be an effective approach for preparation of more complex nanocom...