Sorbonne Paris Cité, Paris Diderot University, Interfaces, Traitements, Organisation et Dynamique des Systèmes Laboratory, CNRS-UMR 7086, 15 rue J. A. Baif, 75013 Paris, France.
Sorbonne Paris Cité, Paris Descartes University, Neurophotonics Laboratory, CNRS UMR 8250, 45 rue des Saints-Pères, 75006 Paris, France.
Nano Lett. 2015 Oct 14;15(10):6454-63. doi: 10.1021/acs.nanolett.5b02921. Epub 2015 Sep 8.
Transport-reaction processes at individual Ag nanoparticles (NPs) are studied using electrochemistry coupled with in situ 3D light scattering microscopy. Electrochemistry is used to trigger a (i) diffusiophoretic transport mode capable of accelerating and preconcentrating NPs toward an electrode and (ii) subsequent diffusion-controlled oxidation of NPs. Individual NP dissolution rate, analyzed using optical modeling, suggests the intervention of insoluble products. New insights into diverse NPs behaviors highlight the strength of coupled optical-electrochemical 3D microscopies for single-NP studies.
使用电化学结合原位 3D 光散射显微镜研究了单个 Ag 纳米颗粒 (NPs) 的传输-反应过程。电化学用于触发 (i) 扩散迁移模式，能够加速和预浓缩 NPs 到电极，以及 (ii) 随后的 NPs 扩散控制氧化。使用光学模型分析单个 NP 的溶解速率表明存在不溶性产物的干预。对不同 NPs 行为的新见解突出了耦合的光学电化学 3D 显微镜在单 NP 研究中的优势。
