Kinetically Controlled Nucleation Enabled by Tunable Microfluidic Mixing for the Synthesis of Dendritic Au@Pt Core/Shell Nanomaterials

Wubin Wang; Yacheng Wang; Dongtang Zhang; Guangsheng Guo; Leyu Wang; Xiayan Wang

doi:10.1002/smll.202302589

Kinetically Controlled Nucleation Enabled by Tunable Microfluidic Mixing for the Synthesis of Dendritic Au@Pt Core/Shell Nanomaterials

Small. 2024 Mar;20(13):e2302589. doi: 10.1002/smll.202302589. Epub 2023 Nov 15.

Authors

Wubin Wang¹, Yacheng Wang¹, Dongtang Zhang¹, Guangsheng Guo^{1

2}, Leyu Wang³, Xiayan Wang¹

Affiliations

¹ Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Beijing University of Technology, Beijing, 100124, China.
² Minzu University of China, Beijing, 100081, China.
³ State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.

PMID: 37967327
DOI: 10.1002/smll.202302589

Abstract

The nucleation stage plays a decisive role in determining nanocrystal morphology and properties; hence, the ability to regulate nucleation is critical for achieving high-level control. Herein, glass microfluidic chips with S-shaped mixing units are designed for the synthesis of Au@Pt core/shell materials. The use of hydrodynamics to tune the nucleation kinetics is explored by varying the number of mixing units. Dendritic Au@Pt core/shell nanomaterials are controllably synthesized and a formation mechanism is proposed. As-synthesized Au@Pt exhibited excellent ethanol oxidation activity under alkaline conditions (8.4 times that of commercial Pt/C). This approach is also successfully applied to the synthesize of Au@Pd core/shell nanomaterials, thus demonstrating its generality.

Keywords: Au@Pt; core/shell materials; fluid control; microfluidic synthesis.

Abstract

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