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Visualization of the Coalescence of Bismuth Nanoparticles

Published online by Cambridge University Press:  17 March 2014

Kai-Yang Niu Open the ORCID record for Kai-Yang Niu [Opens in a new window] ,
Hong-Gang Liao  and
Haimei Zheng
Kai-Yang Niu
Affiliation:
Lawrence Berkeley National Laboratory, Materials Sciences Division, Berkeley, CA 94720, USA
Hong-Gang Liao
Affiliation:
Lawrence Berkeley National Laboratory, Materials Sciences Division, Berkeley, CA 94720, USA
Haimei Zheng*
Affiliation:
Lawrence Berkeley National Laboratory, Materials Sciences Division, Berkeley, CA 94720, USA Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
*
*Corresponding author. [email protected]
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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.

Keywords

liquid cell TEMin situ TEMcoalescencesurface diffusiongrain boundary diffusion
Type
In Situ Special Section
Information
Microscopy and Microanalysis , Volume 20 , Issue 2 , April 2014 , pp. 416 - 424
Copyright
© Microscopy Society of America 2014 

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