2D free-standing ultra-large ferromagnetic nanosheets via a topotactic transformation strategy

IF 10.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Science China Chemistry Pub Date : 2025-01-02 DOI:10.1007/s11426-024-2340-0

Haofeng Sun, Minghao Wang, Wenjie Li, Yang Liu, Xinyu Sun, Wenjie Wang, Yuqiao Guo, Yi Xie, Changzheng Wu

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Abstract

Considerable progress has been made in synthesizing two-dimensional (2D) materials by exfoliating layered solids. However, for tremendous non-layered inorganic materials, especially magnet solids, usually with closely packed bulk phases by strong chemical bonds, it is challenging to obtain their high-quality 2D sheets. Herein, we highlighted a new structure of free-standing ferromagnetic nanosheets featuring (111) facets. For magnet, Fe₃O₄, its inversed spinel crystalline has limited abilities to exfoliate into 2D forms and rarely exists as free-standing nanosheets owing to aggregation induced by magnetic force. We realized a breakthrough in achieving free-standing ferromagnetic nanosheets with dramatically surpassing size limitations via topotactic conversion from layered counterparts. Our Fe₃O₄ nanosheets exhibited a maximum width of 60 µm while only ∼4 nm thick, prominently exposing (111) facets. 2D Fe₃O₄ behaved anisotropic magnetism, which displayed a 4.6 emu g⁻¹ moment (H=500 Oe) in the (111) plane but 2.1 emu g⁻¹ out of the (111) plane, indicating a (111) in-plane easy axis. We anticipated our topotactic conversion strategy would inspire the creation of 2D non-layered materials and enrich the 2D materials family.

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基于拓扑策略的二维独立超大铁磁纳米片

通过剥离层状固体合成二维（2D）材料已经取得了相当大的进展。然而，对于巨大的非层状无机材料，特别是磁性固体，通常具有紧密堆积的体相，具有强化学键，获得高质量的二维薄片是具有挑战性的。在此，我们重点介绍了一种具有（111）面的独立铁磁纳米片的新结构。对于磁体Fe3O4来说，其反向尖晶石晶体由于磁力引起的聚集，其剥落成二维形式的能力有限，很少以独立纳米片的形式存在。我们实现了一个突破，在获得独立的铁磁纳米片显著超越尺寸限制，从层状对偶物的拓扑战术转换。我们的Fe3O4纳米片的最大宽度为60µm，厚度仅为~ 4 nm，突出地暴露了（111）个面。二维Fe3O4表现出各向异性磁性，其在（111）平面上的力矩为4.6 emu g−1 (H=500 Oe)，而在（111）平面外的力矩为2.1 emu g−1，表明平面内易轴为（111）。我们预计我们的拓扑转换策略将激发2D非分层材料的创造，并丰富2D材料家族。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science China Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

14.40

自引率

7.30%

发文量

3787

审稿时长

2.2 months

期刊介绍： Science China Chemistry, co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China and published by Science China Press, publishes high-quality original research in both basic and applied chemistry. Indexed by Science Citation Index, it is a premier academic journal in the field. Categories of articles include: Highlights. Brief summaries and scholarly comments on recent research achievements in any field of chemistry. Perspectives. Concise reports on thelatest chemistry trends of interest to scientists worldwide, including discussions of research breakthroughs and interpretations of important science and funding policies. Reviews. In-depth summaries of representative results and achievements of the past 5–10 years in selected topics based on or closely related to the research expertise of the authors, providing a thorough assessment of the significance, current status, and future research directions of the field.