Synthesis of single-crystal two-dimensional α-Al2O3 via a precipitation-oxidation process

IF 11 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Rare Metals Pub Date : 2024-11-18 DOI:10.1007/s12598-024-03040-w

Xiao-Ming Tu, Chang-Qing Shen, Chun-Lin Liu, Fang-Zhu Qing, Xue-Song Li

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Abstract

The growth of single-crystal α-Al₂O₃ is crucial for a variety of applications in electronics and other fields, while the synthesis of its two-dimensional (2D) form is not easy due to the high activation energy. Here, we demonstrate the growth of single-crystal 2D α-Al₂O₃ by high temperature (high-T) annealing of Ni foils. Tens of micrometers of 2D α-Al₂O₃ flakes grow on the surface of Ni foils, which is attributed to the precipitation of Al atoms from the Ni foil bulk to its surface, followed by the oxidation of Al atoms on the surface. In principle, the Ni foil acts as a solvent, where diluted metal atoms precipitate onto the surface and react with oxygen from the atmosphere to grow single-crystal 2D metal oxides. Our findings may also provide a promising method for synthesizing other single-crystal 2D metal oxides.

Graphical Abstract

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通过沉淀氧化工艺合成单晶二维 αAl2O3

α-Al2O3单晶的生长对于电子等领域的各种应用至关重要，但由于其高活化能，其二维（2D）形态的合成并不容易。在这里，我们证明了Ni箔通过高温（高t）退火生长出单晶2D α-Al2O3。在Ni箔表面生长出数十微米的二维α-Al2O3薄片，这是由于Al原子从Ni箔体析出到其表面，然后表面的Al原子氧化所致。原则上，镍箔作为溶剂，稀释的金属原子沉淀到表面，并与大气中的氧气反应，生长单晶二维金属氧化物。我们的发现也为其他单晶二维金属氧化物的合成提供了一种有希望的方法。图形抽象

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.