Department of Chemistry, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea.
Int J Mol Sci. 2022 Jul 5;23(13):7472. doi: 10.3390/ijms23137472.
A single silver (Ag) nanoparticle (NP) collision was observed and analyzed in an alkaline solution using the electrocatalytic amplification (EA) method. Previously, the observation of a single Ag NP collision was only possible through limited methods based on a self-oxidation of Ag NPs or a blocking strategy. However, it is difficult to characterize the electrocatalytic activity of Ag NPs at a single NP level using a method based on the self-oxidation of Ag NPs. When using a blocking strategy, size analysis is difficult owing to the edge effect in the current signal. The fast oxidative dissolution of Ag NPs has been a problem for observing the staircase response of a single Ag NP collision signal using the EA method. In alkaline electrolyte conditions, Ag oxides are stable, and the oxidative dissolution of Ag NPs is sluggish. Therefore, in this study, the enhanced magnitude and frequency of the current response for single Ag NP collisions were obtained using the EA method in an alkaline electrolyte solution. The peak height and frequency of single Ag NP collisions were analyzed and compared with the theoretical estimation.
在碱性溶液中，采用电催化放大（EA）方法观察和分析了单个银（Ag）纳米颗粒（NP）的碰撞。在此之前，通过基于 Ag NPs 自氧化或阻断策略的有限方法才有可能观察到单个 Ag NP 碰撞。然而，基于 Ag NPs 自氧化的方法很难在单个 NP 水平上表征 Ag NPs 的电催化活性。当使用阻断策略时，由于电流信号中的边缘效应，尺寸分析变得困难。Ag NPs 的快速氧化溶解一直是使用 EA 方法观察单个 Ag NP 碰撞信号的阶跃响应的问题。在碱性电解质条件下，Ag 氧化物稳定，Ag NPs 的氧化溶解缓慢。因此，在这项研究中，在碱性电解质溶液中使用 EA 方法获得了单个 Ag NP 碰撞的电流响应幅度和频率的增强。分析和比较了单个 Ag NP 碰撞的峰高和频率，并与理论估算值进行了比较。
