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Synthesis and catalytic activity of pluronic stabilized silver-gold bimetallic nanoparticles

机译:普鲁朗稳定的银金双金属纳米粒子的合成及催化活性

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In this report, we demonstrate a rapid, simple, and green method for synthesizing silver-gold (Ag-Au)bimetallic nanoparticles (BNPs). We used a novel modification to the galvanic replacement reaction by suspending maltose coated silver nanoparticles (NPs) in approximate to 2% aqueous solution of EO100PO65EO100 (Pluronic F127) prior to HAuCl4 addition. The Pluronic F127 stabilizes the BNPs, imparts biocompatibility, and mitigates the toxicity issues associated with other surfactant stabilizers. BNPs with higher Au : Ag ratios and, subsequently, different morphologies were successfully synthesized by increasing the concentration of gold salt added to the Ag NP seeds. These BNPs have enhanced catalytic activities than typically reported for monometallic Au or Ag NPs (similar to 2-10 fold) of comparable sizes in the sodium borohydride reduction of 4-nitrophenol. The 4-nitrophenol reduction rates were highest for partially hollow BNP morphologies.
机译:在此报告中,我们演示了一种快速,简单且绿色的合成银金(Ag-Au)双金属纳米粒子(BNP)的方法。我们通过在添加HAuCl4之前将麦芽糖包被的银纳米颗粒(NPs)悬浮在大约2%的EO100PO65EO100(Pluronic F127)水溶液中,对电置换反应进行了新颖的修饰。 Pluronic F127可以稳定BNP,赋予生物相容性并减轻与其他表面活性剂稳定剂相关的毒性问题。通过增加添加到Ag NP种子中的金盐的浓度,成功合成了具有较高Au:Ag比的BNP,并随后合成了不同的形态。这些BNP的催化活性比4-硝基苯酚的硼氢化钠还原过程中可比较大小的单金属Au或Ag NPs(约2-10倍)通常报道的要强。对于部分中空的BNP形态,4-硝基苯酚的还原率最高。

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