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Plasma-assisted electrochemical synthesis of monodisperse Au and Au@Ag core-shell nanoparticles

机译:单分散Au和Au @ Ag核 - 壳纳米粒子的等离子体辅助电化学合成

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摘要

The synthesis of well defined nanoparticles with green chemistry has been an area of intense investigation, but still requires development. In this study, we propose a novel approach for controlling the particle size and distribution through diffusion-controlled growth of plasma-assisted electrochemical synthesis. The continuous, controlled addition of an Au precursor with syringe pump successfully controls the particle size in the range of 50-300 nm with a monodisperse size distribution. Moreover, gold nanoparticles can be formed successfully without any stabilizer and reducing agent. Through optimization of the reaction parameters, including the reaction temperature, discharge current of the microplasma, pH, and concentration of D-(-)-fructose, we verify two distinct feature of diffusion-controlled growth that the particle growth is good agreement of theoretical growth rate (r similar to t(1/3)) and the formed gold nanoparticles exhibit polyhedral or near-spherical shapes. This method has been applied to synthesize Au@Ag core-shell nanoparticles and control the Ag shell thickness.
机译:具有绿色化学的良好定义的纳米粒子的合成是一个强烈的调查领域,但仍需要发展。在这项研究中,我们提出了一种通过扩散控制的等离子体辅助电化学合成的扩散生长来控制粒度和分布的新方法。使用注射器泵的连续,控制的Au前体加入Au前体,通过单分散尺寸分布成功地控制50-300nm范围内的粒径。此外,可以成功形成金纳米颗粒而没有任何稳定剂和还原剂。通过优化反应参数,包括反应温度,导微块状的放电电流,pH值和D - ( - ) - 果糖的浓度,我们验证了粒子增长的扩散控制增长的两个不同特征,即粒子生长是理论良好的吻合生长速率(类似于T(1/3))和形成的金纳米颗粒表现出多面或近球形形状。该方法已被应用于合成Au @ Ag核 - 壳纳米粒子并控制Ag壳厚度。

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