Eur. Phys. J. Spec. Top. (2022) 231: 4233-4244
https://doi.org/10.1140/epjs/s11734-022-00571-0

Regular Article

Co, Fe and CoFe oxide nanoparticle assemblies within an ordered silica matrix: effects of the metal ions and synthesis pathway on the microstructure and magnetic properties

¹ Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris-Saclay, 91400, Orsay, France
² Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface, LRS, 75005, Paris, France

^a laura.altenschmidt@universite-paris-saclay.fr
^f anne.bleuzen@universite-paris-saclay.fr

Received: 3 December 2021
Accepted: 9 April 2022
Published online: 29 April 2022

Abstract

The magnetic properties of nanoparticle assemblies strongly depend on the structural and morphological characteristics of the individual nanoparticles as well as on their organization within the assembly. Here, we present the synthesis of cobalt and/or iron oxide nanoparticles within the ordered mesoporosity of a silica monolith by two different synthesis pathways (using either Prussian blue analogues or nitrate salts as a precursor). We describe the influence of the nature of the metal ion and of the synthesis pathway on the morphology of the nanoparticles. With respect to these observations, we present and discuss the temperature-dependent magnetic behaviors of the final nanocomposites.