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影响因子：11.8

DOI码：10.1002/smll.202402717

发表刊物：Small

摘要：Investigating the structural evolution and phase transformation of iron oxides is crucial for gaining a deeper understanding of geological changes on diverse planets and preparing oxide materials suitable for industrial applications. In this study, in-situ heating techniques are employed in conjunction with transmission electron microscopy (TEM) observations and ex-situ characterization to thoroughly analyze the thermal solid-phase transformation of akaganéite 1D nanostructures with varying diameters. These findings offer compelling evidence for a size-dependent morphology evolution in akaganéite 1D nanostructures, which can be attributed to the transformation from akaganéite to maghemite (γ-Fe2O3) and subsequent crystal growth. Specifically, it is observed that akaganéite nanorods with a diameter of ∼50 nm transformed into hollow polycrystalline maghemite nanorods, which demonstrated remarkable stability without arresting crystal growth under continuous heating. In contrast, smaller akaganéite nanoneedles or nanowires with a diameter ranging from 20 to 8 nm displayed a propensity for forming single-crystal nanoneedles or nanowires through phase transformation and densification. By manipulating the size of the precursors, a straightforward method is developed for the synthesis of single-crystal and polycrystalline maghemite nanowires through solid-phase transformation. These significant findings provide new insights into the size-dependent structural evolution and phase transformation of iron oxides at the nanoscale.

合写作者：Yang He, Lili Liu, Duo Song, Libor Kovarik, Mark E. Bowden, Mark Engelhard, Xiaoxu Li, Yingge Du, Quin RS Miller, Chongmin Wang, James J. De Yoreo

第一作者：Xiang Wang

通讯作者：Kevin M. Rosso, Xin Zhang

学科门类：工学

文献类型：J

卷号：20

期号：46

页面范围：2402717

是否译文：否

发表时间：2024-08-15

收录刊物：SCI

发布期刊链接：https://onlinelibrary.wiley.com/doi/full/10.1002/smll.202402717