High-yield preparation of uniform cobalt hydroxide and oxide nanoplatelets and their characterization.
High-yield preparation of uniform cobalt hydroxide and oxide nanoplatelets and their characterization.
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DOI：
10.1021/jp0521149
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
Yanglong Hou;H. Kondoh;M. Shimojo;T. Kogure;T. Ohta
中科院分区：
文献类型：
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作者：
Yanglong Hou;H. Kondoh;M. Shimojo;T. Kogure;T. Ohta
在聚乙烯吡咯烷酮存在下，通过简单的水热路线以高产率（约95%）制备了具有均匀六边形形状的氢氧化钴纳米片。该方法提供了一种简单、低成本、大规模制备平均直径为280 nm、厚度约为200 nm的β-氢氧化钴纳米片的方法。26 nm，显示出主要的结晶良好的六方水镁石样相。在设计的温度下，它们的热分解产生各向异性的纳米片的钴氧化物（CoO和Co 3 O 4）。采用透射电子显微镜、选区电子衍射、傅里叶变换红外光谱、差示扫描量热和热重分析对产物进行了表征。用超导量子干涉仪研究了产物的磁性能。Co_3O_4纳米片具有超顺磁性，有望作为各向异性纳米结构研究磁隧穿效应。
Cobalt hydroxide nanoplatelets with a uniform hexagonal shape were prepared in high yield ( approximately 95%) by a facile hydrothermal route in the presence of poly(vinylpyrrolidone). This method provides a simple, low-cost, and large-scale route to produce beta-cobalt hydroxide nanoplatelets with an average diameter of 280 nm and a thickness of ca. 26 nm which show a predominant well-crystalline hexagonal brucite-like phase. Their thermal decomposition produced anisotropic nanoplatelets of cobalt oxides (CoO and Co3O4) under designed temperatures. The products were characterized by transmission electronic microscopy, selected-area electron diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetric, and thermogravimetric analysis. The magnetic properties of the products were investigated by a superconducting quantum interference device magnetometer. Co3O4 nanoplatelets exhibit a superparamagnetic behavior, and they might be a promising material to study the magnetic tunneling effect as anisotropic nanostructures.