Low-temperature fabrication of Au-Co cluster mixed nanohybrids with high magnetic moment of Co.
Low-temperature fabrication of Au-Co cluster mixed nanohybrids with high magnetic moment of Co.
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DOI：
10.1021/am301572u
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发表时间：
2012-10
影响因子：
9.5
通讯作者：
Dong-Feng Zhang;Qian Zhang;Weifeng Huang;Lin Guo;Weimeng Chen;Wang Chu;Chinping Chen;Ziyu Wu
中科院分区：
文献类型：
--
作者：
Dong-Feng Zhang;Qian Zhang;Weifeng Huang;Lin Guo;Weimeng Chen;Wang Chu;Chinping Chen;Ziyu Wu
近年来，基于Au的混合物的协同效应产生了巨大的科学兴趣。Au和Co的混合物有望表现出有吸引力的性质。在本文中，我们报道了通过温和的溶液方法成功地制备了具有链状结构的体相不混溶的Au和Co之间的纳米杂化物。元素分布、XRD和EXAFS数据表明，所制备的AuCo纳米杂化物可能为团簇混合结构。一个连续的氧化还原和沉淀促进的聚集/扩散过程，提出了阐明的纳米杂化物的形成机制。在300 K时，样品的饱和磁化强度与温度无关，每个Co原子的磁矩高达2.95 μ（B），远高于体相值（每个Co原子的磁矩为1.7 μ（B）），接近原子Co的理论值（每个Co原子的磁矩为3.0 μ（B））。
In recent years, the synergistic effects of Au-based hybrids have generated enormous scientific interest. The hybrids of Au and Co are expected to exhibit attractive properties. In this paper, we report the successful fabrication of the nanohybrids between bulk-immiscible Au and Co with chain-like structures via a mild solution method. Elemental mapping, XRD and EXAFS data reveal that the as-prepared AuCo nanohybrids might be of cluster mixed configuration. A sequential redox and imperfection-promoted aggregation/diffusion process is proposed to elucidate the formation mechanism of the nanohybrids. The as-prepared products exhibit a temperature-independent saturation magnetization with the magnetic moment of Co as high as ~2.95 μ(B) for each Co atom at 300 K, much higher than the bulk value (~1.7 μ(B) for each Co atom) and approaching the theoretical value of an atomic Co (~3.0 μ(B) for each Co atom).