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Discharge time dependence of a solution plasma process for colloidal copper nanoparticle synthesis and particle characteristics

机译：溶液等离子体工艺对胶体铜纳米粒子合成的放电时间依赖性及其粒子特性

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摘要

In this study, we investigate a new synthetic route, termed the solution plasma process, for the synthesis of colloidal copper nanoparticles (CuNPs) in the presence of an amide and acid capping agent. Gelatin and ascorbic acid were selected as the capping agents to protect the particles against coalescence and oxidation side reaction. Using a high voltage power supply, CuNPs were rapidly formed by 1 min after the discharge. The size and shape of the CuNPs were dependent on the discharge time and were clearly influenced by the effect of the capping agents under two characteristics of the discharge medium (pH and temperature). With a long discharge time, the CuNP size tended to decrease with the formation of anisotropic particle morphologies: spherical, cubic, hexagonal, triangular and rod-like shapes. The decrease in CuNP size as a function of discharge time could be explained by the dissolution of CuNPs in a lower pH solution. After 5 min discharge the capping agent evidently allowed the protection of the synthesized CuNPs against oxidation with the presence of anisotropic CuNP shapes. It is demonstrated that the CuNP shape could be tuned from spherical to anisotropic shapes without the undesirable oxidation by adjusting the discharge time of the solution plasma. These advantages are valuable for material engineering to design the properties of Cu-based nanoparticles for the desired applications.
机译：在这项研究中，我们研究了一种新的合成路线，称为溶液等离子体工艺，用于在酰胺和酸封端剂的存在下合成胶体铜纳米颗粒（CuNP）。选择明胶和抗坏血酸作为封端剂以保护颗粒免于聚结和氧化副反应。使用高压电源，在放电后1分钟内会迅速形成CuNP。 CuNPs的大小和形状取决于放电时间，并且在放电介质的两个特征（pH和温度）下明显受到封端剂作用的影响。随着放电时间的延长，CuNP尺寸趋于随着各向异性颗粒形态的形成而减小：球形，立方，六边形，三角形和棒状。 CuNP尺寸随放电时间的减少可以通过将CuNPs溶解在较低pH的溶液中来解释。放电5分钟后，封端剂显然可以保护合成的CuNPs免受各向异性CuNP形状的氧化作用。已经证明，通过调节溶液等离子体的放电时间，可以将CuNP形状从球形形状改变为各向异性形状而没有不希望的氧化。这些优点对于材料工程设计所需的应用的基于铜的纳米粒子的特性是有价值的。

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