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Visualization of the Coalescence of Bismuth Nanoparticles

  • Kai-Yang Niu (a1), Hong-Gang Liao (a1) and Haimei Zheng (a1) (a2)
Abstract
Abstract

Coalescence is a significant pathway for the growth of nanostructures. Here we studied the coalescence of Bi nanoparticles in situ by liquid cell transmission electron microscopy (TEM). The growth of Bi nanoparticles was initiated from a bismuth neodecanoate precursor solution by electron beam irradiation inside a liquid cell under the TEM. A significant number of coalescence events occurred from the as-grown Bi nanodots. Both symmetric coalescence of two equal-sized nanoparticles and asymmetric coalescence of two or more unequal-sized nanoparticles were analyzed along their growth trajectories. Our observation suggests that two mass transport mechanisms, i.e., surface diffusion and grain boundary diffusion, are responsible for the shape evolution of nanoparticles after a coalescence event.

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*Corresponding author. hmzheng@lbl.gov
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Microscopy and Microanalysis
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