Kim Joodeok, Kang Dohun, Kang Sungsu, Kim Byung Hyo, Park Jungwon
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.
Center for Nanoparticle Research, Institute of Basic Science (IBS), Seoul 08826, Republic of Korea.
iScience. 2022 Jul 1;25(8):104699. doi: 10.1016/j.isci.2022.104699. eCollection 2022 Aug 19.
Coalescence, one of the major pathways observed in the growth of nanoparticles, affects the structural diversity of the synthesized nanoparticles in terms of sizes, shapes, and grain boundaries. As coalescence events occur transiently during the growth of nanoparticles and are associated with the interaction between nanoparticles, mechanistic understanding is challenging. The ideal platform to study coalescence events may require real-time tracking of nanoparticle growth trajectories with quantitative analysis for coalescence events. Herein, we track nanoparticle growth trajectories using liquid-cell transmission electron microscopy (LTEM) to investigate the role of coalescence in nanoparticle formation and their morphologies. By evaluating multiple coalescence events for different platinum group metals, we reveal that the surface energy and ligand binding energy determines the rate of the reshaping process and the resulting final morphology of coalesced nanoparticles. The coalescence mechanism, based on direct LTEM observation explains the structures of noble metal nanoparticles that emerge in colloidal synthesis.
聚结是纳米颗粒生长过程中观察到的主要途径之一，在尺寸、形状和晶界方面影响合成纳米颗粒的结构多样性。由于聚结事件在纳米颗粒生长过程中瞬时发生，且与纳米颗粒之间的相互作用有关，因此对其机理的理解具有挑战性。研究聚结事件的理想平台可能需要对纳米颗粒生长轨迹进行实时跟踪，并对聚结事件进行定量分析。在此，我们使用液池透射电子显微镜（LTEM）跟踪纳米颗粒的生长轨迹，以研究聚结在纳米颗粒形成及其形态中的作用。通过评估不同铂族金属的多个聚结事件，我们发现表面能和配体结合能决定了聚结纳米颗粒的重塑过程速率和最终形态。基于直接LTEM观察的聚结机制解释了胶体合成中出现的贵金属纳米颗粒的结构。
Zotero 插件
