Regioselective magnetization in semiconducting nanorods

March 24, 2020


Regioselective magnetization in semiconducting nanorods


Tao-Tao Zhuang, Yi Li, Xiaoqing Gao, Mingyang Wei, F. Pelayo García de Arquer, Petar Todorović, Jie Tian, Gongpu Li, Chong Zhang, Xiyan Li, Liang Dong, Yonghong Song, Yang Lu, Xuekang Yang, Libing Zhang, Fengjia Fan, Shana O. Kelley, Shu-Hong Yu, Zhiyong Tang, Edward H. Sargent




Nature nanotechnology


Chirality—the property of an object wherein it is distinguishable from its mirror image—is of widespread interest in chemistry and biology1,2,3,4,5,6. Regioselective magnetization of one-dimensional semiconductors enables anisotropic magnetism at room temperature, as well as the manipulation of spin polarization—the properties essential for spintronics and quantum computing technology7. To enable oriented magneto-optical functionalities, the growth of magnetic units has to be achieved at targeted locations on a parent nanorod. However, this challenge is yet to be addressed in the case of materials with a large lattice mismatch. Here, we report the regioselective magnetization of nanorods independent of lattice mismatch via buffer intermediate catalytic layers that modify interfacial energetics and promote regioselective growth of otherwise incompatible materials. Using this strategy, we combine materials with distinct lattices, chemical compositions and magnetic properties, that is, a magnetic component (Fe3O4) and a series of semiconducting nanorods absorbing across the ultraviolet and visible spectrum at specific locations. The resulting heteronanorods exhibit optical activity as induced by the location-specific magnetic field. The regioselective magnetization strategy presented here enables a path to designing optically active nanomaterials for chirality and spintronics.




Circular dichroism, Magnetic circular dichroism, Stereochemistry, Chemical stability, Semiconductors, Nanostructures, Materials