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Growth and assembly of cobalt oxide nanoparticle rings at liquid nanodroplets with solid junction

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Abstract

Using liquid cell TEM, we imaged the formation of CoO nanoparticle rings. Nanoparticles nucleated and grew tracing the perimeter of droplets sitting on the SiNx solid substrate, and finally formed necklace-like rings. By tracking single nanoparticle trajectories during the ring formation and an estimation of the forces between droplets and nanoparticles using a simplified model, we found the junction of liquid nanodroplets with a solid substrate is the attractive site for CoO nanoparticles. Coalescing droplets were capable of pushing nanoparticles to the perimeter of the new droplet and nanoparticles on top of the droplets rolled off toward the perimeter. We propose that the curved surface morphology of the droplets created a force gradient that contributed to the assembly of nanoparticles at the droplet perimeter. Revealing the dynamics of nanoparticle movements and the interactions of nanoparticles with the liquid nanodroplet provides insights on developing novel self-assembly strategies for building precisely defined nanostructures on solid substrates.

Graphical abstract: Growth and assembly of cobalt oxide nanoparticle rings at liquid nanodroplets with solid junction

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Publication details

The article was received on 23 Jun 2017, accepted on 28 Aug 2017 and first published on 29 Aug 2017


Article type: Communication
DOI: 10.1039/C7NR04554A
Citation: Nanoscale, 2017, Advance Article
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    Growth and assembly of cobalt oxide nanoparticle rings at liquid nanodroplets with solid junction

    Y. Zhou, A. S. Powers, X. Zhang, T. Xu, K. Bustillo, L. Sun and H. Zheng, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR04554A

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