2026-04-17T05:39:36Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2221212025-12-04T21:41:57Zcom_2072_1057col_2072_478917col_2072_478933

00925njm 22002777a 4500 dc Figueroa Garcia, Adriana Isabel author Moya Álvarez, Carlos author Aribó, M. X. author Ara Escario, Jorge author García del Muro y Solans, Montserrat author Kleibert, Armin author Valencia, Sergio author Labarta, Amílcar author Batlle Gelabert, Xavier author Fraile Rodríguez, Arantxa author 2025-07-09T12:14:59Z 2025-07-09T12:14:59Z 2024-10-01 2025-07-09T12:14:59Z The chemical and magnetic properties of NiO nanoparticles (NP) have been studied with single-particle sen-sitivity by means of synchrotron-based, polarization-dependent X-ray absorption spectroscopy using photoemis-sion electron microscopy around the Ni L3,2 edges. Three samples of NP in a size range of 40-120 nm were syn-thesized by thermal decomposition and subsequent calcination processes. The analysis of the local X-ray absorption spectra of tens of individual NP indicates a strong dependence of their Ni oxidation state with the cal-cination protocol of each sample. Additional electron-microscopy-based images and spectra of a few individual NP as well as other standard macroscopic data are in very good agreement with these experimental findings. These results showcase the relevance of combining standard and advanced single-particle studies to gain further insight into the understanding and control of electronic and magnetic phenomena at the nanoscale. Nanopartícules Espectroscòpia de raigs X Nanoparticles X-ray spectroscopy X-ray spectromicroscopy of single NiOantiferromagnetic nanoparticles