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

作     者：Jing Deng Yuan-Yun Zhao Yong Shen Chuntao Chang Qiang Li Jing Deng;Yuan-Yun Zhao;Yong Shen;Chuntao Chang;Qiang Li

作者机构：School of Physics Science and TechnologyXinjiang UniversityUrumqi 830046China Neutron Scattering Technical Engineering Research CenterSchool of Mechanical EngineeringDongguan University of TechnologyDongguan 523808China Guangdong-HongKong-MacaoJoint Laboratory for Neutron Scattering Science and TechnologyDongguan University of TechnologyDongguan 523808China Instituteof Metal ResearchChinese Academy of SciencesShenyang 110016China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2022年第35卷第11期

页      面：1777-1786页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：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) the National Natural Science Foundation of China(Grant No.51871056)。 

主　　题：Metallic glasses Mg-based alloys Dealloying Nanoporous particles Mg-Au-Gd phase 

摘      要：Nanoporous metals have attracted signifi cant attention owing to their excellent physical,chemical,and biological properties.However,preparing ultrafi ne nanoporous metal particles(1–5μm)with specifi c geometries remains challenging.Herein,we report a simple strategy to prepare ultrafi ne fl aky hexagonal nanoporous Au-Cu and Au particles via dealloying.Mg-based alloy ribbons with ultrafi ne fl aky 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 fl aky hexagonal Mg-Au(Cu)-Gd particles were controlled by the solidifi cation process of a Mg 61 Cu 21 Au 7 Gd 11 alloy melt.Ultrafi ne fl aky hexagonal nanoporous Au-Cu particles(diagonal diameter 2.58±0.44μm,ligament size~28 nm),Au-1 particles(diagonal diameter 2.38±0.35μm,ligament size~83 nm)and Au-2 particles(diagonal diameter 2.39±0.44μm,ligament size~66 nm)were prepared via ultrasonic-assisted dealloying of Mg 61 Cu 21 Au 7 Gd 11 alloy ribbons in 0.25 M HCl/ethanol,1 M HCl/ethanol and 0.25 M HNO 3/ethanol solutions,respectively.The ultrafi ne fl aky hexagonal nanoporous Au-Cu and Au particles with a large specifi c surface area have a uniform particle size and shape,implying that they possess adequate powder fl uidity and excellent catalytic properties.Moreover,the formation mechanism of the MgAu(Cu)Gd phase in solidifi ed Mg-Cu-Au-Gd alloys was discussed.This study provides a novel approach for synthesizing nanoporous metal particles with a specifi c geometry.