Z. Yang,T. Altantzis,S.Bals, G. Van Tendeloo, M. P. Pileni J.Phys. Chem.C., 2018, DOI. 10.1021/acs.jpcc.7b12373
We study the oxygen thermal stability of two binary systems. The larger particles are magnetic Co (7.2 nm) or Fe3O4 (7.5 nm) nanocrystals whereas the smaller ones (3.7 nm) are Au nanocrystals. The nanocrystal ordering, as well as the choice of the magnetic nanoparticles very much influence the stability of the binary system. A perfect crystalline structure is obtained with the Fe3O4/Au binary supracrystals. For the Co/Au binary system, oxidation of Co results in the chemical transformation from Co to CoO, where the size of the Co nanoparticles increases from 7.2 to 9.8 nm in diameter. During the volume expansion of the Co nanoparticles, Au nanoparticles within the binary assemblies coalescence and are at the origin of the instability of the binary nanoparticle supracrystals. On the other hand, for the Fe3O4/Au binary system, the oxidation of Fe3O4 to g-Fe2O3 does not lead to a size change of the nanoparticles, which maintains the stability of the binary nanoparticle supracrystals.