Room temperature synthesis of two-dimensional multilayer magnets based on á-CoII layered hydroxides

HUNT, DIEGO; OESTREICHER, VÍCTOR; FICKERT, MICHAEL; DOLLE, CHRISTIAN; ABELLÁN, GONZALO

Nano Materials Science

Elsevier

Año: 2020

2589-9651

Research ontwo-dimensional (2D) materials is one of the most active fields inmaterials science and nanotechnology. Among the members of the 2Dfamily, layered hydroxides (LHs) represent an exceptional case ofstudy due their unparalleled chemical versatility which allows themodulation of their physicochemical properties at will. Nowadays, LHsbased on earth-abundant metals are key materials in the areas ofenergy conversion and storage, hybrid materials or magnetism. ɑ-Cohydroxides (Simonkolleite-like structures) are promising phases withtuneable electronic and magnetic properties by ligand modification.However, even in the simple case of ɑ-CoIIhydroxychlorides, the preparation of well-defined large 2D crystalsis not straightforward, hindering the development of fundamentalstudies. Herein, we present the synthesis of 2D hexagonal crystalswith outstanding size-thickness relationship (diameter > 5 ìmand thickness of 20 ± 7 nm) by a simple homogeneous synthesistaking place at room temperature. In structural terms, no differencesare observed between our nanomaterials and those obtainedhydrothermally. However, dynamic susceptibility measurements alertabout different arrangements of the magnetic sublattices, which havebeen rationalized with structural DFT calculations. This workprovides an extremely easy bottom-up method to obtain high-quality 2Dcrystals based on ɑ-CoII hydroxides, paving the way forthe development of fundamental studies and applicationsp { margin-bottom: 0.25cm; line-height: 120% }