Quasi-Epitaxial Growth of Magnetic Nanostructures on 4H-Au Nanoribbons
Quasi-Epitaxial Growth of Magnetic Nanostructures on 4H-Au Nanoribbons
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4H-Au 纳米带上磁性纳米结构的准外延生长
DOI：
10.1002/adma.202007140
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Hua Zhang
中科院分区：
文献类型：
--
作者：
Hongfei Cheng;Nailiang Yang;Xiaozhi Liu;Yilv Guo;Bin Liu;Jianghui Yang;Ye Chen;Bo Chen;Zhanxi Fan;Qipeng Lu;Shijun Yauan;Jinlan Wang;Lin Gu;Hua Zhang
纳米材料的相位工程是一种有效的策略，可以调整纳米材料的物理化学特性用于各种有前途的应用。 Herein, by using the 4H-Au nanoribbons as templates, four novel magnetic nanostructures, namely 4H-Au@14H-Co nanobranches, 4H-Au@14H-Co nanoribbons, 4H-Au@2H-Co nanoribbons, and 4H-Au@2H-Ni nanoribbons, are synthesized based on the quasiepitaxial 生长。与金属纳米材料的常规外延生长不同，所获得的CO和Ni纳米结构与AU模板具有不同的晶体相。由于AU和生长金属（即CO和Ni）之间的晶格不匹配较大，因此在CO/AU和Ni/Au接口处产生有序的不合适位错。值得注意的是，形成了一种新的CO的超级结构，称为14H。 4H-AU@14H-CO纳米分支和纳米容器在室温下都是铁磁，显示出相似的curie.tepperature。然而，它们的磁性行为表现出明显的温度依赖性，这是由于自旋和体积之间的竞争而产生的。裂解以及独特的几何形状。这项工作为纳米材料具有非常规晶体相的纳米材料合成铺平了道路。
Phase engineering of nanomaterials is an effective strategy to tune the physicochemical properties of nanomaterials for various promising applications. Herein, by using the 4H-Au nanoribbons as templates, four novel magnetic nanostructures, namely 4H-Au@14H-Co nanobranches, 4H-Au@14H-Co nanoribbons, 4H-Au@2H-Co nanoribbons, and 4H-Au@2H-Ni nanoribbons, are synthesized based on the quasiepitaxial growth. Different from the conventional epitaxial growth of metal nanomaterials, the obtained Co and Ni nanostructures possess different crystal phases from the Au template. Due to the large lattice mismatch between Au and the grown metals (i.e., Co and Ni), ordered misfit dislocations are generated at the Co/Au and Ni/Au interfaces. Notably, a new super-structure of Co is formed, denoted as 14H. Both 4H-Au@14H-Co nanobranches and nanoribbons are ferromagnetic at room temperature, showing similar Curie.temperature. However, their magnetic behaviors exhibit distinct temperature.dependence, resulting from the competition between spin and volume.fluctuations as well as the unique geometry. This work paves the way to the.templated synthesis of nanomaterials with unconventional crystal phases for.the exploration of phase-dependent properties.