journal article·2024-05-14

Facile Gram-Scale Synthesis of Size-Tunable MgO Nanosheets Enclosed by (111) Surface with Remarkable Stability and Uniform Host Sites for Atom Dispersion

Shengpei Zhang, Chao Zhao, Yves Ira A. Reyes, Pei Xiong, Tianxiang Chen, Tianqi Cheng, Xianfeng Yi, Shang-Wei Chou, Chia-Ying Chien, Ya-Yun Yang, Jian Lin Chen, Tsz Woon Benedict Lo, Molly Meng-Jung Li, Hsin-Yi Tiffany Chen, Anmin Zheng, Yung-Kang Peng

Chemistry of Materials· Volume 36· Issue 9
Publisher page

Abstract

MgO has long been utilized as a catalyst/support with Lewis base properties in the chemical industry, but its synthesis with exposed (111) surfaces has received relatively little attention compared to those of (110) and (100) surfaces. The unique adsorption energy of this surface for adsorbates also remains elusive. Herein, we present a simple and scalable method for the production of MgO nanosheets exposing the (111) surface (denoted as MgO(111) NSs). This is achieved through the topotactic conversion of Mg(OH) 2 NSs at elevated temperatures in an air environment. By adjusting the precursor ratio and the strength of the base, we successfully prepared Mg(OH) 2 NSs consisting of approximately 6 atomic layers with lateral sizes ranging from 80 nm to 1 μm in a single step. Subsequent thermal dehydration yields MgO(111) NSs with a preserved dimension. Using Ru as the adsorbate, we found that the remarkable stability and uniformity of its atomic dispersion on the (111) surface can be attributed to the strong structural coordination provided by three oxygen atoms. In contrast, the metal–support interaction on the (110) and (100) surfaces proved to be insufficient to overcome the cohesive energy between Ru atoms, resulting in the formation of Ru clusters. Beyond Ru, this study holds great potential in guiding the rational selection of surfaces to achieve a uniform atomic dispersion of other elements.
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Research context

OpenAlex topics: Magnesium Oxide Properties and Applications · Copper-based nanomaterials and applications · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, City University of Hong Kong, Hong Kong 999077, Hong Kong SAR

Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300044, Taiwan

Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong 999077, Hong Kong SAR

Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong 999077, Hong Kong SAR

State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China

Instrumentation Center, National Taiwan University, Taipei 10617, Taiwan

Department of Applied Science, School of Science and Technology, Hong Kong Metropolitan University, Hong Kong 999077, Hong Kong SAR

College of Semiconductor Research, National Tsing Hua University, Hsinchu 300044, Taiwan

Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan

City University of Hong Kong Chengdu Research Institute, Chengdu 610203, China

Funding

Research Grants Council, University Grants Committee · National Tsing Hua University · City University of Hong Kong · Sichuan Province Science and Technology Support Program · National Science and Technology Council

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