Topotaxy in Layered Cobalt Oxide/Oxyhydroxide Thin Films.

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Pub Date : 2025-09-23 DOI:10.1021/acs.inorgchem.5c02992

Tomohito Sudare,Kazunori Nishio,Ryo Nakayama,Naoomi Yamada,Taro Hitosugi

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引用次数: 0

Abstract

Inorganic metal hydroxides have found various applications in catalysis, batteries, sensors, and adsorbents. Epitaxial thin films offer well-defined crystallographic orientations and uniform surfaces, providing a prominent platform for the fundamental study of anisotropic and surface-driven functionalities. However, no reports have demonstrated the control of the crystallographic orientations of the metal hydroxide epitaxial thin films. In this study, using β-CoOOH as a model system, we demonstrate crystallographic orientation control of metal hydroxide epitaxial thin films using "topotaxy" reaction. We first fabricate the precursor β-NaxCoO2 epitaxial thin films through a reactive solid-state epitaxy using seven different single-crystal substrates: Al2O3(0001), SrTiO3(100), and (110). (111), and MgAl2O4(100), (110), (111). Subsequently, the precursor films are immsersed in an acidic solution and transformed into successfully obtain β-CoOOH (001) and (012) epitaxial thin films on the Al2O3(0001) and SrTiO3(100) substrates, respectively. Furthermore, we confirm that the surface morphology reflects the crystallographic orientations and that the coordination environment of Co ions is consistent with that of the bulk material. This study represents a significant step forward in fabricating metal hydroxide epitaxial thin films, paving the way for developing novel functionalities related to hydroxyl groups.

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层状氧化钴/氢氧化物薄膜的拓扑结构。

无机金属氢氧化物在催化、电池、传感器和吸附剂等方面有着广泛的应用。外延薄膜提供了明确的晶体取向和均匀的表面，为各向异性和表面驱动功能的基础研究提供了一个突出的平台。然而，目前还没有关于氢氧化物外延薄膜晶体取向控制的报道。在本研究中，我们以β-CoOOH为模型体系，利用“topotaxy”反应证明了金属氢氧化物外延薄膜的晶体取向控制。我们首先使用七种不同的单晶衬底：Al2O3(0001), SrTiO3（100）和（110），通过反应性固态外延制备前驱体β-NaxCoO2外延薄膜。（111）和MgAl2O4(100),(110),（111）。随后，将前驱体膜浸泡在酸性溶液中，分别在Al2O3（0001）和SrTiO3（100）衬底上成功转化为β-CoOOH（001）和（012）外延薄膜。此外，我们证实了表面形貌反映了晶体学取向，并且Co离子的配位环境与块状材料的配位环境一致。这项研究代表了金属氢氧化物外延薄膜制造的重要一步，为开发与羟基相关的新功能铺平了道路。

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

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.