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Coalescence dynamics of platinum group metal nanoparticles revealed by liquid-phase transmission electron microscopyopen access

Authors
Kim, J.Kang, D.Kang, S.Kim, B.H.Park, J.
Issue Date
Aug-2022
Publisher
Elsevier Inc.
Keywords
Materials characterization; Materials chemistry; Materials science
Citation
iScience, v.25, no.8
Journal Title
iScience
Volume
25
Number
8
URI
http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42472
DOI
10.1016/j.isci.2022.104699
ISSN
2589-0042
Abstract
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. © 2022 The Author(s)
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College of Engineering (Department of Materials Science and Engineering)
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