Synthesis, Characterization, and Self-Assembly of Pencil-Shaped CoO Nanorods

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• 作者：Kwangjin An ; Nohyun Lee ; Jongnam Park ; Sung Chul Kim ; Yosun Hwang ; Je-Geun Park ; Jae-Young Kim ; Jae-Hoon Park ; Myung Joon Han ; Jaejun Yu ; Taeghwan Hyeon
• 刊名：Journal of the American Chemical Society
• 出版年：2006
• 出版时间：August 2, 2006
• 年：2006
• 卷：128
• 期：30
• 页码：9753 - 9760
• 全文大小：866K
• 年卷期：v.128,no.30(August 2, 2006)
• ISSN：1520-5126

文摘

We synthesized uniformly sized, pencil-shaped CoO nanorods by the thermal decomposition ofa cobalt-oleate complex, which was prepared from the reaction of cobalt chloride and sodium oleate. Thediameters and lengths of the CoO nanorods were easily controlled by varying the experimental conditions,such as the heating rate and the amount of Co-oleate complex. The X-ray diffraction pattern revealedthat the CoO nanorods have an extraordinary wurtzite ZnO crystal structure. These uniformly sized nanorodsself-assembled to form both horizontal parallel arrangements and perpendicular hexagonal honeycombsuperlattice structures. Reduction of the nanorods by heating under a hydrogen atmosphere generatedeither hcp Co or Co₂C nanorods. Characterization of the CoO nanorods using X-ray absorption spectroscopy,X-ray magnetic circular dichroism spectroscopy, and magnetic measurements showed that they contain asmall fraction of ferromagnetic Co impurities.