Design of AgM Bimetallic Alloy Nanostructures (M = Au, Pd, Pt) with Tunable Morphology and Peroxidase-Like Activity

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• 作者：Weiwei He ; Xiaochun Wu ; Jianbo Liu ; Xiaona Hu ; Ke Zhang ; Shuai Hou ; Weiya Zhou ; Sishen Xie
• 刊名：Chemistry of Materials
• 出版年：2010
• 出版时间：May 11, 2010
• 年：2010
• 卷：22
• 期：9
• 页码：2988-2994
• 全文大小：883K
• 年卷期：v.22,no.9(May 11, 2010)
• ISSN：1520-5002

文摘

Bimetallic alloy nanoparticles (NPs) exhibit unique optical and catalytic properties that are dependent on their morphology and composition. In this paper, a general and facile way was developed to prepare Ag-related bimetallic alloy NPs with hollow/porous structures, including AgAu, AgPd, and AgPt. The formation of the alloy structures is evidenced by high-resolution transmission electron microscopy (TEM), scanning transmission electron microscopy−energy-dispersive X-ray analysis (STEM-EDX) mapping, and ultraviolet−visible−near-infrared (UV−vis−NIR) absorption spectra. AgM alloy NPs exhibit peroxidase-like activity. A unique composition dependence is found and can be used to tailor the catalytic activity. In addition to the recent discoveries about peroxidase mimetics on Fe₃O₄ NPs and sheetlike FeS nanostructures, our findings suggest a new type of candidate as peroxidase mimics. Furthermore, for noble metals, apart from size and shape, tailoring the composition poses another effective way to tune the catalytic activity.