Yazhou Qin,Jiahao Teng,Han Zhang,Fan Li,Yingsheng He
Hollow flower-like multi-metallic nanocrystals have attracted significant research attention due to their exceptional catalytic properties, which stem from their high surface area-to-volume ratio and abundant active sites. Nevertheless, conventional synthesis methods for noble metal nanocrystals typically involve complex procedures or require harsh reaction conditions. In this work, we developed a facile and environmentally benign strategy for fabricating hollow flower-shaped trimetallic nanocrystals at ambient temperature. Our approach employs AgCl nanocubes, derived from AgNO3and HAuCl4, as self-sacrificing templates. Through ascorbic acid-mediated reduction of metal precursors, we successfully synthesized three distinct types of hollow flower-like nanocrystals: AuAgCu, AuAgPt, and AuAgPd. Comprehensive characterization confirmed the well-defined morphology and precise composition control of the as-prepared nanocrystals. The catalytic performance was systematically evaluated through in situ UV–vis spectroscopy monitoring of 4-nitrophenylthiophenol reduction, revealing the following activity trend: AuAgCu > AuAgPt > AuAgPd. This study not only provides a versatile platform for constructing sophisticated multi-metallic nanostructures but also offers valuable insights into the structure–activity relationship of complex catalysts.
Herein, the preparation of AuAgPt alloy yolk-shell nanostructures with tunable elemental compositions and morphologies by conducting the mild, successive galvanic replacement reaction (GRR) between Au@Ag core-shell nanocubes and H 2 PtCl 6 is reported. In particular, the resulting products can be featured with well-defined cubic frames and the distribution of all the three metals over the whole particle, which is enabled by the unique “etching and regrowth” mechanism. Due to the strong absorbance in visible region, the current products exhibit superb performances in two localized surface plasmon resonance (LSPR)-based applications, photothermal heat conversion, and plasmon-enhanced catalytic reduction of 4-nitrophenol (4-NP). In particular, the optimized photothermal heat conversion efficiency and the apparent rate constant of photocatalytic 4-NP reduction reach 12.9% and 0.155 min −1 , respectively, for the sample AuAgPt-6 and AuAgPt-12, respectively. Herein the present study, a feasible strategy for fabrication of plasmonic-active multimetallic alloy nanocrystals with yolk-shell structure and cubic frame-like edges is offered and their promising use in photothermal heat conversion and photocatalysis is validated, which could be extended to other alloys or material combinations for rational design of nanoscale materials with plasmon-enhanced properties.
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