Liquid Cell Electron Microscopy of Nanoparticle Self-Assembly Driven by Solvent Drying

Title
Liquid Cell Electron Microscopy of Nanoparticle Self-Assembly Driven by Solvent Drying
Authors
최선Won Chul LeeByung Hyo KimShoji TakeuchiJungwon Park
Issue Date
2017-02
Publisher
Journal of Physical Chemistry Letters
Citation
VOL 8, NO 3-654
Abstract
Drying a colloidal solution of nanoparticles is a versatile method to construct self assembled structures of nanoparticles. However, mechanistic understanding has mostly relied on empirical knowledge obtained from the final structures of self-assembly as relevant processes during solvent drying are likely kinetic and far from equilibrium. Here, we present in situ TEM studies of nanoparticle self-assembly under various conditions, including the concentrations of the initial solution and the types of nanoparticles and substrates. The capability of tracking trajectories of individual nanoparticles enables us to understand the mechanisms of drying-mediated self assembly at the single-nanoparticle level. Our results consistently show that a solvent boundary primarily affects nanoparticle motions and the resulting self-assembly processes regardless of different conditions. The solvent boundary drives nanoparticles to form two-dimensional assembly mainly through two pathways, transporting scattered nanoparticles by lateral dragging and flattening aggregated nanoparticles by vertical pressing.
URI
http://pubs.kist.re.kr/handle/201004/66982
ISSN
1948-7185
Appears in Collections:
KIST Publication > Article
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