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Ligand-Dependent Coalescence Behaviors of Gold Nanoparticles Studied by Multichamber Graphene Liquid Cell Transmission Electron Microscopy

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Title
Ligand-Dependent Coalescence Behaviors of Gold Nanoparticles Studied by Multichamber Graphene Liquid Cell Transmission Electron Microscopy
Author(s)
Yuna Bae; Lim, K.; Kim, S.; Dohun Kang; Byung Hyo Kim; Joodeok Kim; Sungsu Kang; Jeon, S.; Cho, J.; Lee, W.B.; Lee, W.C.; Jungwon Park
Publication Date
2020-12
Journal
NANO LETTERS, v.20, no.12, pp.8704 - 8710
Publisher
AMER CHEMICAL SOC
Abstract
The formation mechanism of colloidal nanoparticles is complex because significant nonclassical pathways coexist with the conventional nucleation and growth processes. Particularly, the coalescence of the growing clusters determines the final morphology and crystallinity of the synthesized nanoparticles. However, the experimental investigation of the coalescence mechanism is a challenge because the process is highly kinetic and correlates with surface ligands that dynamically modify the surface energy and the interparticle interactions of nanoparticles. Here, we employ quantitative in situ TEM with multichamber graphene liquid cell to observe the coalescence processes occurring in the synthesis of gold nanoparticles in different ligand systems, thus affording us an insight into their ligand-dependent coalescence kinetics. The analyses of numerous liquid-phase TEM trajectories of the coalescence and MD simulations of the ligand shells demonstrate that enhanced ligand mobility, employing a heterogeneous ligand mixture, results in the rapid nanoparticle pairing approach and a fast post-merging structural relaxation.
URI
https://pr.ibs.re.kr/handle/8788114/9006
DOI
10.1021/acs.nanolett.0c03517
ISSN
1530-6984
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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