Issue 47, 2020

Enhanced structural and magnetic properties of fcc colloidal crystals of cobalt nanoparticles

Abstract

We report the elaboration of supercrystals made up of dodecanoic acid-coated 8.1 nm-Co nanocrystals with controlled supercrystallinity, morphology and magnetic properties. Supercrystal growth is controlled using a solvent-mediated ligand–ligand interaction strategy. Either face-centered cubic supercrystalline films or single colloidal crystals composed of cobalt nanocrystals are obtained. The change in supercrystal morphology is explained by Flory-type solvation theory using Hansen solubility colloidal parameters. The use of the same batch of Co nanocrystals for the fabrication of supercrystalline films and colloidal crystals enables accurate comparative structural and magnetic studies using (high-resolution) transmission electron microscopy, field emission gun scanning electron microscopy, grazing incidence small-angle X-ray scattering and vibrating sample magnetometry. The nearest neighbor distance between nanoparticles is interpreted using theoretical models proposed in the literature. We evidence the increase in both geometric anisotropy and magnetic dipolar interactions for colloidal crystals compared to supercrystalline films.

Graphical abstract: Enhanced structural and magnetic properties of fcc colloidal crystals of cobalt nanoparticles

Article information

Article type
Paper
Submitted
24 Jul. 2020
Accepted
04 Nov. 2020
First published
17 Nov. 2020

Nanoscale, 2020,12, 24020-24029

Enhanced structural and magnetic properties of fcc colloidal crystals of cobalt nanoparticles

S. Costanzo, A. T. Ngo, V. Russier, P. A. Albouy, G. Simon, Ph. Colomban, C. Salzemann, J. Richardi and I. Lisiecki, Nanoscale, 2020, 12, 24020 DOI: 10.1039/D0NR05517D

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