Transformation of Co₃O₄ nanoparticles to CoO monitored by in situ TEM and predicted ferromagnetism at the Co₃O₄/CoO interface from first principles.

ABSTRACT: Nanoparticles of Co₃O₄ and CoO are of paramount importance because of their chemical properties propelling their applications in catalysis and battery materials, and because of their intriguing magnetic properties. Here we elucidate the transformation of Co₃O₄ nanoparticles to CoO into nanoscale detail by in situ heating in the transmission electron microscope (TEM), and we decipher the energetics and magnetic properties of the Co₃O₄/CoO interface from first principles calculations. The transformation was found to start at a temperature of 350 °C, and full conversion of all particles was achieved after heating to 400 °C for 10 minutes. The transformation progressed from the surface to the center of the nanoparticles u

SUBMITTER: Chen X 

PROVIDER: S-EPMC8101414 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature