Kang Jianxin, Hu Qi, Zhang Ruixuan, Gao Ang, Huang Zhongning, Su Ziming, Pei Ke, Zhang Qinghua, Liu Li-Min, Che Renchao, Gu Lin, Guo Er-Jia, Guo Lin
School of Chemistry, Beihang University, Beijing 100191, China.
Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Academy for Engineering & Technology, Fudan University, Shanghai 200438, China.
Natl Sci Rev. 2024 May 16;11(7):nwae175. doi: 10.1093/nsr/nwae175. eCollection 2024 Jul.
Anisotropy is a significant and prevalent characteristic of materials, conferring orientation-dependent properties, meaning that the creation of original symmetry enables key functionality that is not found in nature. Even with the advancements in atomic machining, synthesis of separated symmetry in different directions within a single structure remains an extraordinary challenge. Here, we successfully fabricate NiS ultrafine nanorods with separated symmetry along two directions. The atomic structure of the nanorod exhibits rotational symmetry in the radial direction, while its axial direction is characterized by divergent translational symmetry, surpassing the conventional crystalline structures known to date. It does not fit the traditional description of the space group and the point group in three dimensions, so we define it as a new structure in which translational symmetry and rotational symmetry are separated. Further corroborating the atomic symmetric separation in the electronic structure, we observed the combination of stripe and vortex magnetic domains in a single nanorod with different directions, in accordance with the atomic structure. The manipulation of nanostructure at the atomic level introduces a novel approach to regulate new properties finely, leading to the proposal of new nanotechnology mechanisms.
各向异性是材料的一个重要且普遍的特性，赋予材料依赖于取向的属性，这意味着原始对称性的创造能够实现自然界中不存在的关键功能。即便原子加工技术取得了进展，但在单一结构内合成不同方向的分离对称性仍然是一项巨大的挑战。在此，我们成功制备出了沿两个方向具有分离对称性的硫化镍超细纳米棒。纳米棒的原子结构在径向呈现旋转对称性，而其轴向则具有发散的平移对称性，超越了迄今为止已知的传统晶体结构。它不符合三维空间群和点群的传统描述，因此我们将其定义为一种平移对称性和旋转对称性分离的新结构。进一步证实了电子结构中的原子对称分离，我们观察到在单个纳米棒中，根据原子结构，不同方向上存在条纹和涡旋磁畴的组合。在原子水平上对纳米结构的操控引入了一种精细调节新特性的新方法，从而催生了新纳米技术机制的提出。
