Low-Temperature Fabrication of Au鈥揅o Cluster Mixed Nanohybrids With High Magnetic Moment of Co
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- 作者：Dong-Feng Zhang ; Qian Zhang ; Wei-Feng Huang ; Lin Guo ; Wei-Meng Chen ; Wang-Sheng Chu ; Chinping Chen ; Zi-Yu Wu
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：October 24, 2012
- 年：2012
- 卷：4
- 期：10
- 页码：5643-5649
- 全文大小：402K
- 年卷期：v.4,no.10(October 24, 2012)
- ISSN：1944-8252
文摘
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 渭B for each Co atom at 300 K, much higher than the bulk value (1.7 渭B for each Co atom) and approaching the theoretical value of an atomic Co (3.0 渭B for each Co atom).