Controlled Growth and Magnetic Property of FePt Nanostructure: Cuboctahedron, Octapod, Truncated Cube, and Cube

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• 作者：Shang-Wei Chou ; Chun-Ling Zhu ; Sonnathi Neeleshwar ; Cheng-Lung Chen ; Yang-Yuan Chen ; Chia-Chun Chen
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：October 27, 2009
• 年：2009
• 卷：21
• 期：20
• 页码：4955-4961
• 全文大小：905K
• 年卷期：v.21,no.20(October 27, 2009)
• ISSN：1520-5002

文摘

The strategy for shape control of alloy FePt nanocrystal was studied systematically. By the careful adjustments of reaction parameters in a solution reaction, surfactant−facet bindings on the growth seed were controlled delicately. FePt octapod, cuboctahedron, truncated cube, and nanocube were successfully prepared from cuboctahedral seed and examined by high-resolution transmission electron microscopy. The formations of FePt nanostructures were mainly attributed to the differences in the growth rate between the {111} and {100} planes of cuboctahedral seeds. The magnetic measurements showed that the order of volume, V_(nanocube) > V_(octapod) > V_{(cuboctahedron)} obviously reflected the order of saturated magnetization (M_s), M_{s (nanocube)} > M_{s (octapod)} > M_{s (cuboctahedron)}. Furthermore, the measurements of octapod exhibited the highest coercivity and blocking temperature because of its higher surface to volume ratio and more structural facets.