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首页> 外文期刊>Chemistry: A European journal >Rapid Synthesis of Hollow Ag-Au Nanodendrites in 15 Seconds by Combining Galvanic Replacement and Precursor Reduction Reactions
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Rapid Synthesis of Hollow Ag-Au Nanodendrites in 15 Seconds by Combining Galvanic Replacement and Precursor Reduction Reactions

机译：电流取代和前体还原反应相结合在15秒内快速合成空心Ag-Au纳米树枝状晶体

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摘要

Metallic nanomaterials displaying hollow interiors as well as sharp tips/branches at their surface (such as hollow nanodendrites) are attractive, because these features enable higher surface-to-volume ratios than their solid and/or rounded counterparts. This paper describes a simple strategy for the synthesis of Ag-Au nanodendrites in 15s using Ag nanospheres prepared in a previous synthetic step as seeds. Our approach was based on the utilization of Ag nanospheres as seeds for Au deposition by a combination of galvanic replacement reaction between Ag and AuCl4-(aq) and AuCl4-(aq) reduction using hydroquinone in the presence of polyvinylpyrrolidone (PVP) as a stabilizer and water as the solvent. The produced Ag-Au nanodendrites presented monodisperse sizes, and their surface morphologies could be tuned as a function of growth time. Owing to their hollow interiors and sharp tips, the Ag-Au nanodendrites performed as effective substrates for surface-enhanced Raman scattering (SERS) detection of 4-MPy (4-mercaptopyridine) and R6G (rhodamine 6G) as probe molecules. We believe that the approach described herein can serve as a protocol for the fast and one-step synthesis of Ag-Au hollow nanondendrites with a wide range of sizes, compositions, and surface morphologies for applications in SERS and catalysis.
机译：金属纳米材料具有中空内部以及在其表面具有尖锐的尖端/分支（例如中空纳米树枝状晶体）具有吸引力，因为这些特征比其固体和/或圆形对应物具有更高的表面积/体积比。本文介绍了一种使用先前合成步骤中制备的Ag纳米球作为种子在15s内合成Ag-Au纳米枝晶的简单策略。我们的方法基于通过在聚乙烯吡咯烷酮（PVP）作为稳定剂的情况下，使用对苯二酚与Ag和AuCl4-（aq）之间的电置换反应以及使用对苯二酚进行AuCl4-（aq）还原反应的组合，利用Ag纳米球作为Au沉积的种子和水作为溶剂。产生的Ag-Au纳米枝晶呈现单分散尺寸，其表面形态可根据生长时间进行调整。由于其空心的内部空间和尖锐的尖端，Ag-Au纳米树枝晶可作为有效基质用于表面增强拉曼散射（SERS）检测4-MPy（4-巯基吡啶）和R6G（若丹明6G）作为探针分子。我们相信，本文描述的方法可以用作快速，一步合成Ag-Au中空纳米树枝状晶体的协议，具有各种尺寸，组成和表面形态，可用于SERS和催化。

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