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首页> 外文期刊>Particle & Particle Systems Characterization: Measurement and Description of Particle Properties and Behavior in Powders and Other Disperse Systems >Controllably Hollow AgAu Nanoparticles via Nonaqueous, Reduction Agent-Assisted Galvanic Replacement
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Controllably Hollow AgAu Nanoparticles via Nonaqueous, Reduction Agent-Assisted Galvanic Replacement

机译：通过非水，还原剂辅助电常用替换可控地空心Alab纳米粒子

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摘要

The galvanic replacement reaction is a robust tool for the controlled synthesis of hollow and semihollow bimetallic nanostructures, which have applications in a range of science, engineering, and medical fields due to the tunability of their localized surface plasmon resonances (LSPRs) and surface chemistry. Here, a controllable galvanic replacement of Ag by Au coupled with coreduction is described, performed in nonaqueous solvents including methanol, ethanol, and an N,N-dimethylformamide:toluene mixture and yielding hollow and semihollow alloyed nanoparticles. Structural control, from semihollow to nanoshell, and plasmon tunability are demonstrated via control of the Au:Ag stoichiometry. The high structural dependence on temperature is shown, with striking changes in nanoparticle surface smoothness and pinhole density, and reveals the optimal reaction temperature to be 65 degrees C in alcohols. Through optimizing this reaction, smooth closed shell AgAu alloy nanoparticles with LSPRs tunable from 494 to 567 nm are obtained. This work provides a framework for galvanic replacement of large anisotropic Ag nanoparticles with Au in nonaqueous media, which can be extended to other solvent systems suitable for air-sensitive metals and precursors.
机译：电流替代反应是一种鲁棒工具，用于控制中空和半层双金属纳米结构的合成，其由于其局部表面等离子体共振（LSPRS）和表面化学的可调性而具有各种科学，工程和医疗领域的应用。这里，描述了通过Au耦合的Ag的可控电流替代，在包括甲醇，乙醇和N，N-二甲基甲酰胺的非水溶剂中进行：甲苯混合物并产生中空合金纳米粒子。通过Semirolounh inaoshell从半色调的结构控制，通过Au：Ag化学计量的控制证明了等离子体可调性。显示了对温度的高结构依赖性，纳米颗粒表面光滑度和针孔密度的打击变化，并揭示了醇中最佳反应温度为65℃。通过优化该反应，获得具有494至567nm的LSPRS的光滑封闭壳Agau合金纳米粒子。这项工作提供了一种在非水介质中具有Au的大型各向异性Ag纳米粒子的电常态替代的框架，其可以扩展到适用于空气敏感金属和前体的其他溶剂系统。

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