title: Sampling the structure and chemical order in assemblies of ferromagnetic nanoparticles by nuclear magnetic resonance.
abstract: Assemblies of nanoparticles are studied in many research fields from physics to medicine. However, as it is often difficult to produce mono-dispersed particles, investigating the key parameters enhancing their efficiency is blurred by wide size distributions. Indeed, near-field methods analyse a part of the sample that might not be representative of the full size distribution and macroscopic methods give average information including all particle sizes. Here, we introduce temperature differential ferromagnetic nuclear resonance spectra that allow sampling the crystallographic structure, the chemical composition and the chemical order of non-interacting ferromagnetic nanoparticles for specific size ranges within their size distribution. The method is applied to cobalt nanoparticles for catalysis and allows extracting the size effect from the crystallographic structure effect on their catalytic activity. It also allows sampling of the chemical composition and chemical order within the size distribution of alloyed nanoparticles and can thus be useful in many research fields.
authors.affiliation: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR 7515 CNRS-University of Strasbourg, ECPM, 25, rue Becquerel, 67087 Strasbourg 02, France.
authors.forename: Yuefeng
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS-University of Strasbourg, 23, rue du Loess, 67034 Strasbourg 02, France.
authors.forename: Jingjie
authors.initials: J
authors.lastname: Luo
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS-University of Strasbourg, 23, rue du Loess, 67034 Strasbourg 02, France.|Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 120-750, South Korea.
authors.forename: Yooleemi
authors.initials: Y
authors.lastname: Shin
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS-University of Strasbourg, 23, rue du Loess, 67034 Strasbourg 02, France.
authors.forename: Simona
authors.initials: S
authors.lastname: Moldovan
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS-University of Strasbourg, 23, rue du Loess, 67034 Strasbourg 02, France.
authors.forename: Ovidiu
authors.initials: O
authors.lastname: Ersen
authors.affiliation: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR 7515 CNRS-University of Strasbourg, ECPM, 25, rue Becquerel, 67087 Strasbourg 02, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Hébraud
authors.affiliation: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR 7515 CNRS-University of Strasbourg, ECPM, 25, rue Becquerel, 67087 Strasbourg 02, France.
authors.forename: Guy
authors.initials: G
authors.lastname: Schlatter
authors.affiliation: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), UMR 7515 CNRS-University of Strasbourg, ECPM, 25, rue Becquerel, 67087 Strasbourg 02, France.
authors.forename: Cuong
authors.initials: C
authors.lastname: Pham-Huu
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS-University of Strasbourg, 23, rue du Loess, 67034 Strasbourg 02, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Meny