Self-assembled Growth of Fe Doped AlN Nanowires/3D Nanosheets Composite Hierarchical Nanostructures
FU Nian1, GU Yu2, GUO Yu1, ZHANG Jianfei1, CHEN Daojun1, LIU Xiaoyu1, CONG Ridong1
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China 2 Material Systems for Nanoelectronics, Chemnitz University of Technology, Chemnitz 09107, Germany
Abstract: Self-assembled hierarchical nanostructures have attracted wide attention due to their novel properties. In this paper, plasma-assisted direct current (DC) arc discharge method was used to one-step prepare AlN∶Fe nanowires/three dimensional (3D) nanosheets composite hierarchical nanostructures using FeAl alloy and N2 as the reaction sources. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray electron spectrometer (EDS), high-resolution transmission electron microscope (HRTEM) were carried on for the detailed analysis of the crystal structure, morphology, element composition, microstructure of the hierarchical structure. We found that the combined hierarchical nanostructures are composed of in situ self-assemble of AlN∶Fe nanoparticles on the one-dimensional AlN∶Fe nanwires. Investigation on the growth mechanism of the hierarchical nanostructures showed that the electric dipole moment and surface charge accumulation of AlN∶Fe magnetic nanoparticles cooperatively promote the self-assembly of magnetic nanoparticles to form the AlN∶Fe nanosheet structure. At the same time, magnetism analysis showed that the hierarchical nanostructures exhibit ferromagnetism at room temperature. The spontaneous polarization caused by uncancelled spontaneous magnetic moment in 3d band of Fe3+ should be the primary cause of its magnetism. The implementation of this work provides the feasibility of using self-assembly magnetic nanoparticles to prepare complex hierarchical nanostructure system.
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2020, Vol. 34 
