Facile aqueous-phase synthesis of Ag\u2013Cu\u2013Pt\u2013Pd quadrometallic nanoparticles

Zengmin Tang,Sang Soo Han,Taekyung Yu,Suk Ho Bhang,Byung Chul Yeo,Tae-Jin Lee,Woo-Sik Kim

doi:10.1186/s40580-019-0208-z

Zengmin Tang, Sang Soo Han + Show 5 more

Open Access

https://doi.org/10.1186/s40580-019-0208-z

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Abstract

Ag–Cu–Pt–Pd quadrometallic nanoparticles which small Pt and Pd nanoparticles were attached on the surface of AgCu Janus nanoparticles were firstly synthesized by sequential reduction of Pt and Pd precursor in the presence of Janus AgCu bimetallic nanoparticles as seeds in an aqueous solution. Even though there was a small amount of Cu2O on the surface, the synthesized nanoparticles were mainly composed of four independent metallic part, not alloy parts. By theoretical calculation and growth mechanism study, we found that different reducing rate between Ag+ and Cu2+ and sequential reduction of Pt and Pd precursors would be key roles for the formation of the quadrometallic nanoparticles.

Highlights

Multi-metallic nanoparticles including bi- and tri- metals have been considered as a new category of attractive advanced materials due to their enhanced catalytic properties compared with their individual components [1,2,3,4]
2.3 Synthesis of Ag–Cu–Pt–Pd metallic nanoparticle After washing process, obtained Ag–Cu nanoparticles were dispersed in a 5 mL of aqueous solution containing l-ascorbic acid (5 mg) and PVP (2.5 mg) and stirred at room temperature. 100 μL of K2PtCl4 (0.01 M) solution was added into the solution using a pipette
3 Results and discussion Ag–Cu–Pt–Pd quadrometallic nanoparticles were synthesized by the sequential reduction of Pt and Pd precursor in the presence of AgCu bimetallic nanoparticles as seeds (Scheme 1)

Summary

Introduction

Multi-metallic nanoparticles including bi- and tri- metals have been considered as a new category of attractive advanced materials due to their enhanced catalytic properties compared with their individual components [1,2,3,4] They modified the electronic structure of metals which enables to tune the binding energy between catalysts and reaction intermediate, and generated the synergistic effect which can enhance the catalytic activity and durability [5,6,7]. In the past few decades, there have been lots of solution-based synthetic processes for multi-metallic nanoparticles including thermal decomposition, co-reduction, galvanic replacement, and seed-mediated growth [11, 18,19,20,21]. We studied the growth mechanism of the quadrometallic nanoparticles by using theoretical calculation and monitoring the growth behavior

Experimental methods

Results and discussion

Conclusions