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Real-space imaging of nanoparticle transport and interaction dynamics by graphene liquid cell TEM

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Title
Real-space imaging of nanoparticle transport and interaction dynamics by graphene liquid cell TEM
Author(s)
Sungsu Kang; Kim, Ji-Hyun; Lee, Minyoung; Yu, Ji Woong; Kim, Joodeok; Kang, Dohun; Baek, Hayeon; Bae, Yuna; Kim, Byung Hyo; Kang, Seulki; Shim, Sangdeok; Park, So-Jung; Lee, Won Bo; Taeghwan Hyeon; Sung, Jaeyoung; Jungwon Park
Publication Date
2021-12
Journal
Science Advances, v.7, no.49
Publisher
American Association for the Advancement of Science
Abstract
Copyright © 2021 The Authors, some rights reserved;Thermal motion of colloidal nanoparticles and their cohesive interactions are of fundamental importance in nanoscience but are difficult to access quantitatively, primarily due to the lack of the appropriate analytical tools to investigate the dynamics of individual particles at nanoscales. Here, we directly monitor the stochastic thermal motion and coalescence dynamics of gold nanoparticles smaller than 5 nm, using graphene liquid cell (GLC) transmission electron microscopy (TEM). We also present a novel model of nanoparticle dynamics, providing a unified, quantitative explanation of our experimental observations. The nanoparticles in a GLC exhibit non-Gaussian, diffusive motion, signifying dynamic fluctuation of the diffusion coefficient due to the dynamically heterogeneous environment surrounding nanoparticles, including organic ligands on the nanoparticle surface. Our study shows that the dynamics of nanoparticle coalescence is controlled by two elementary processes: diffusion-limited encounter complex formation and the subsequent coalescence of the encounter complex through rotational motion, where surface-passivating ligands play a critical role.
URI
https://pr.ibs.re.kr/handle/8788114/10979
DOI
10.1126/sciadv.abi5419
ISSN
2375-2548
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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