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Preparation of Flaky Hexagonal Nanoporous Au-Cu and Au Particles via Dealloying

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Nanoporous metals have attracted significant attention owing to their excellent physical, chemical, and biological properties. However, preparing ultrafine nanoporous metal particles (1–5 μm) with specific geometries remains challenging. Herein, we report a simple strategy to prepare ultrafine flaky hexagonal nanoporous Au-Cu and Au particles via dealloying. Mg-based alloy ribbons with ultrafine flaky hexagonal Mg-Au(Cu)-Gd particles dispersed in a Mg-Cu(Au)-Gd metallic glassy matrix were prepared. The size and morphology of the precipitated flaky hexagonal Mg-Au(Cu)-Gd particles were controlled by the solidification process of a Mg61Cu21Au7Gd11 alloy melt. Ultrafine flaky hexagonal nanoporous Au-Cu particles (diagonal diameter 2.58 ± 0.44 μm, ligament size ~ 28 nm), Au-1 particles (diagonal diameter 2.38 ± 0.35 μm, ligament size ~ 83 nm) and Au-2 particles (diagonal diameter 2.39 ± 0.44 μm, ligament size ~ 66 nm) were prepared via ultrasonic-assisted dealloying of Mg61Cu21Au7Gd11 alloy ribbons in 0.25 M HCl/ethanol, 1 M HCl/ethanol and 0.25 M HNO3/ethanol solutions, respectively. The ultrafine flaky hexagonal nanoporous Au-Cu and Au particles with a large specific surface area have a uniform particle size and shape, implying that they possess adequate powder fluidity and excellent catalytic properties. Moreover, the formation mechanism of the MgAu(Cu)Gd phase in solidified Mg-Cu-Au-Gd alloys was discussed. This study provides a novel approach for synthesizing nanoporous metal particles with a specific geometry.

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Acknowledgements

This research was financially supported by the National Key Research and Development Program of China (No. 2021YFB3800504), the Tianshan Innovation Team Program of Xinjiang Uygur Autonomous Region (Grand No. 2020D14038), the Department of Education of Guangdong in China (Nos. 2021KCXTD050, 2018KZDXM069), and the National Natural Science Foundation of China (Grant No. 51871056)

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Authors and Affiliations

  1. School of Physics Science and Technology, Xinjiang University, Urumqi, 830046, China

    Jing Deng & Qiang Li

  2. Neutron Scattering Technical Engineering Research Center, School of Mechanical Engineering, Dongguan University of Technology, Dongguan, 523808, China

    Jing Deng, Yuan-Yun Zhao & Chuntao Chang

  3. Guangdong-Hong Kong-Macao, Joint Laboratory for Neutron Scattering Science and Technology, Dongguan University of Technology, Dongguan, 523808, China

    Yuan-Yun Zhao & Chuntao Chang

  4. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Yong Shen

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  1. Jing Deng
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Correspondence to Yuan-Yun Zhao, Chuntao Chang or Qiang Li.

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Deng, J., Zhao, YY., Shen, Y. et al. Preparation of Flaky Hexagonal Nanoporous Au-Cu and Au Particles via Dealloying. Acta Metall. Sin. (Engl. Lett.) 35, 1777–1786 (2022). https://doi.org/10.1007/s40195-022-01431-5

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