Quasi‐Epitaxial Growth of Magnetic Nanostructures on 4H‐Au Nanoribbons,Advanced Materials

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Quasi‐Epitaxial Growth of Magnetic Nanostructures on 4H‐Au Nanoribbons
Advanced Materials ( IF 27.4 ) Pub Date : 2020-11-26 , DOI: 10.1002/adma.202007140
Hongfei Cheng ₁ , Nailiang Yang _{1,

2} , Xiaozhi Liu _{3,

4} , Yilv Guo ₅ , Bin Liu ₆ , Jianhui Yang ₆ , Ye Chen _{1,

7} , Bo Chen _{1,

8} , Zhanxi Fan _{8,

9} , Qipeng Lu _{1,

10} , Shijun Yuan ₅ , Jinlan Wang ₅ , Lin Gu _{3,

4} , Hua Zhang _{8,

9}

Affiliation

Center for Programmable Materials School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences No. 1 Beiertiao, Zhongguancun Beijing 100190 China
Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China
University of Chinese Academy of Sciences Beijing 100049 China
School of Physics Southeast University Nanjing 211189 China
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education College of Chemistry & Materials Science Northwest University Xi'an 710127 China
Department of Chemistry The Chinese University of Hong Kong Shatin, N.T. Hong Kong China
Department of Chemistry City University of Hong Kong Kowloon Hong Kong China
Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM) City University of Hong Kong Hong Kong China
School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

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 quasi‐epitaxial 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.

中文翻译：

在4H-Au纳米带上磁性纳米结构的准外延生长

纳米材料的相工程是一种有效的策略，可针对各种有前途的应用调整纳米材料的理化特性。在这里，通过使用4H-Au纳米带作为模板，四个新颖的磁性纳米结构，即4H-Au @ 14H-Co纳米支，4H-Au @ 14H-Co纳米带，4H-Au @ 2H-Co纳米带和4H-Au @ 2H-Ni纳米带是基于准外延生长合成的。与金属外延材料的常规外延生长不同，所获得的Co和Ni纳米结构与Au模板具有不同的晶相。由于Au与生长的金属（即Co和Ni）之间的晶格失配较大，因此在Co / Au和Ni / Au界面处产生有序的失配位错。值得注意的是，形成了一个新的Co超结构，记为14H。4H-Au @ 14H-Co纳米支和纳米带在室温下都是铁磁性的，显示出相似的居里温度。但是，由于自旋和体积波动之间的竞争以及独特的几何形状，它们的磁行为表现出明显的温度依赖性。这项工作为探索具有非常规晶相的纳米材料进行模板化合成铺平了道路，以探索相依性质。

更新日期：2021-01-04

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