Dynamic observation on the functional metal oxide conversion behaviors in Fe3O4/ZnO heterostructures. (1st March 2020)

• Record Type: Journal Article
• Authors: Huang, Chih-Yang; Tai, Kuo-Lun; Huang, Chun-Wei; Tseng, Yi-Tang; Lo, Hung-Yang; Wu, Wen-Wei
• Is Part Of: Scripta materialia. Number 177(2020)
• Page Start: 192
• Page End: 197
• Publication Date: 2020-03-01
• Subjects: In-situ TEM -- Fe3O4/ZnO heterostructure -- Atomic-scale -- Unidirectional twin -- Solid-state reaction; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.10.035
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We directly observed the atomic diffusion process of bilayered Fe/ZnO transforming into a Fe3 O4 /ZnO heterostructure. Significantly, we suggested a unique two-step route in which Fe diffused along [0001]ZnO via boundaries of ZnO and then reacted along [ 1 ¯ 2 1 ¯ 0]ZnO . The specific orientation relationship of [0001]ZnO //[11 1 ¯ ]Fe3O4 could be precisely controlled. In addition, the formation of a ZnO/Fe3 O4 heterostructure can be tuned in terms of reaction depth by controlling the annealing time. This study provided a novel nanofabricated method to produce oriented metal oxide heterostructures while visualizing the atomic mechanism of metal oxide formation, which allows for further investigation of promising devices. Graphical abstract: Atomic-Oriented heterostructures improve the performance of transition metal oxide-based devices. In this work, the reaction mechanism of Fe3 O4 /ZnO heterostructure was clearly realized and successfully synthesized. Furthermore, the orientation of Fe3 O4 during forming process was well-controlled, which could methodically solve the random-orientation problem of twins. This study provided a novel nanofabricated method to produce oriented metal oxide heterostructures, which allows for further investigation of promising devices. Image, graphical abstract