The method of contact glow discharge with the using of “sacrificial” silver anodes have been proposed for synthesis of silver nanoparticles (AgNPs) stabilized by polyvinylpyrrolidone (PVP). Using transmission electron microscopy, it was found that the mean size of AgNPs decrease from 10 to 5 nm with increasing of PVP concentration from 2.5 to 10 g/L. At the same time, the polydispersity index of AgNPs non-monotonically depends on concentration of stabilizer and the narrowest size distribution (less than 15%) was observed at PVP concentration equal to 5 g/L. The electrochemical investigations of Ag anodic dissolution associated with the recorded UV-Vis spectra of the obtained AgNPs solutions suggest that (i) the rate of silver dissolution depend on the nature of regulating agent—NaOH or CH3COONa; (ii) silver anodes are not passivated in the presence of PVP; (iii) unlike to the process of chemical reduction of silver ions by PVP using of the contact glow discharge technique provides a pseudo-stationary process mode, i.e., the stability of rates of nucleation and growth of AgNPs via stability both of Ag+ and solvated electrons concentrations that leads to formation of nearly monodisperse nanoparticles.

中文翻译：

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使用牺牲银阳极在 PVP 溶液中微等离子体合成银纳米粒子

已经提出了使用“牺牲”银阳极的接触辉光放电方法来合成由聚乙烯吡咯烷酮 (PVP) 稳定的银纳米粒子 (AgNPs)。使用透射电子显微镜，发现随着 PVP 浓度从 2.5 增加到 10 g/L，AgNPs 的平均尺寸从 10 nm 减小到 5 nm。同时，AgNPs 的多分散指数非单调地取决于稳定剂的浓度，并且在 PVP 浓度等于 5 g/L 时观察到最窄的尺寸分布（小于 15%）。Ag 阳极溶解的电化学研究与所获得的 AgNPs 溶液的 UV-Vis 光谱记录相关，表明 (i) 银溶解速率取决于调节剂的性质——NaOH 或 CH3COONa；(ii) 银阳极在 PVP 存在下不被钝化；(iii) 与使用接触辉光放电技术通过 PVP 化学还原银离子的过程不同，它提供了一种伪稳态过程模式，即通过 Ag+ 和溶剂化电子的稳定性来稳定 AgNPs 的成核和生长速率导致形成几乎单分散的纳米粒子的浓度。