標題: Observing Solid-State Formation of Oriented Porous Functional Oxide Nanowire Heterostructures by in Situ TEM
作者: Ho, Jo-Hsuan
Ting, Yi-Hsin
Chen, Jui-Yuan
Huang, Chun-Wei
Tsai, Tsung-Chun
Lin, Ting-Yi
Huang, Chih-Yang
We, Wen-Wei
交大名義發表
材料科學與工程學系
National Chiao Tung University
Department of Materials Science and Engineering
關鍵字: Oriented porous-Fe3O4;ZnO nanowires;heterostructures;in situ TEM;plate-like voids;zigzag-like hollow voids
公開日期: 1-Sep-2018
摘要: Transition metal oxide nanowires have attracted extensive attention because of their physical characteristics. Among them, ZnO nanowires have great potential. Due to the multifunctional properties of ZnO, devices built using ZnO-based heterostructures always perform well. In this study, interesting diffusion behavior between ZnO nanowires and Fe metal was observed by using in situ transmission electron microscopy. ZnO nanowires and Fe metal were annealed under ultrahigh vacuum (UHV) conditions at 800 K. By controlling the annealing time for the solid-state diffusion, porous Fe3O4 and unique ZnO/porous Fe3O4 nanowire heterostructures were formed. As-formed porous Fe3O4 nanowires with voids can be divided into two types by appearance: plate-like voids and zigzag-like hollow voids. From high-resolution transmission electron microscopy (HRTEM) images and fast Fourier transform (FFT) diffraction patterns, we found that plate-like voids formed along the {111} plane, which was the close-packed plane of Fe3O4, and that zigzag-like hollow voids formed along the {111}/{022} planes. Moreover, a transition region existed during diffusion, with a parallel relationship found between the Fe3O4 crystal with plate-like voids and the ZnO crystal. A sharp interface was determined to exist between the Fe3O4 crystal with zigzag-like hollow voids and ZnO. These oriented porous Fe3O4/ZnO axial nanowire heterostructures exhibited a unique appearance and interesting formation behavior. Furthermore, the structures had a high surface-area-to-volume ratio, which is promising for sensing applications.
URI: http://dx.doi.org/10.1021/acs.nanolett.8b03021
http://hdl.handle.net/11536/148159
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.8b03021
期刊: NANO LETTERS
Volume: 18
起始頁: 6064
結束頁: 6070
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