Department of Chemistry, Tongji University, Shanghai 200092, The People's Republic of China.
Inorg Chem. 2011 Oct 3;50(19):9393-9. doi: 10.1021/ic201410f. Epub 2011 Sep 8.
Newly designed magnetic-alloy/noble-metal FeCo/Pt nanorods have been first reported and fabricated through a length-controllable catalyzing-synthesis process in which the growth of FeCo nanorods was induced on Pt nanotips. The length of FeCo/Pt nanorods depends on the number of platinum nanotips. The proposed synthesis mechanism was corroborated by scanning electron microscopy, transition electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. With the decrease of Fe content in Fe(x)Co(96-x)/Pt(4) nanoalloys from 77 to 15, the morphology changes from nanorods with different lengths to nanoparticles. The analysis of the magnetic hysteresis loops indicated that the magnetic saturation and coercivity were strongly dependent on the length of the nanorods in which maximum saturation magnetization and minimum coercivity were obtained for Fe(77)Co(19)/Pt(4) nanorods with the length of ∼2.5 μm. In particular, FeCo/Pt exhibited length-dependent reactivity towards 1,1,2,2-tetrachloroethane, and Fe(77)Co(19)/Pt(4) nanorods with the length of ∼2.5 μm yielded the greatest dechlorination rate. Moreover, Pt can enhance the dechlorination of 1,1,2,2-tetrachloroethane.
新型设计的磁性合金/贵金属 FeCo/Pt 纳米棒首次通过一种长度可控的催化合成过程被报道和制造，其中 FeCo 纳米棒在 Pt 纳米尖端上诱导生长。FeCo/Pt 纳米棒的长度取决于铂纳米尖端的数量。通过扫描电子显微镜、透射电子显微镜、X 射线衍射、能量色散 X 射线光谱和 X 射线光电子能谱证实了所提出的合成机制。随着 Fe(x)Co(96-x)/Pt(4)纳米合金中 Fe 含量从 77 降至 15，形貌从不同长度的纳米棒变为纳米颗粒。磁滞回线的分析表明，磁性饱和和矫顽力强烈依赖于纳米棒的长度，其中最大饱和磁化强度和最小矫顽力出现在长度约为 2.5μm 的 Fe(77)Co(19)/Pt(4)纳米棒中。特别是，FeCo/Pt 对 1,1,2,2-四氯乙烷表现出长度依赖性的反应活性，长度约为 2.5μm 的 Fe(77)Co(19)/Pt(4)纳米棒具有最大的脱氯率。此外，Pt 可以增强 1,1,2,2-四氯乙烷的脱氯。
