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Facile synthesis of metal and alloy nanoparticles by ultrasound-assisted dealloying of metallic glasses

Journal of Materials Science & Technology 2021年第23期82卷 144-152页

作者： Yuan-Yun Zhao Feng Qian Wenfeng Shen Chengliang Zhao Jianguo Wang Chunxiao Xie Fengling Zhou Chuntao Chang Yanjun Li Neutron Scattering Technical Engineering Research Center School of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim7491Norway Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan University of TechnologyDongguan523808China

Metal and alloy nanoparticles synthesized by chemical reduction have attracted increasing attention due to their superior physical,chemical,and biological properties.However,most chemical synthesis processes rely on the use of harsh reducing agents and complicated chemical ingredients.Herein,we report a novel reduction-agent-free and surfactant(stabilizer)-free strategy to synthesize Cu,Ag,Au,Cu-Pt,Cu-Au,Cu-Au-Pt-Pd,and Au-Pt-Pd-Cu nanoparticles by ultrasound-assisted dealloying of Mgbased metallic glasses.The formation mechanism of the metal and alloy nanoparticles is revealed by a detailed investigation of sequential intermediate products.We demonstrate that the glass-liquid phase transition of the initially dealloying metallic glasses,together with the synergistic effect of dealloying and ultrasound-driven ligament-breakage of small enough nanoporous intermediates,play key roles in preparing the uniformly dispersed metal and alloy nanoparticles.This approach greatly simplifies the up-scaling synthesis of monometallic and bimetallic nanoparticles,and also provides a general strategy for synthesizing unprecedented multimetallic nanoparticles.

关键词： Metallic glasses Dealloying Ultrasound nanoparticles multimetallic nanoparticles

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