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Publication (UPOL): Room temperature organic magnets derived from sp3 functionalized graphene
Abstract Materials based on metallic elements that have d orbitals and exhibit room temperature magnetism have been known for centuries and applied in a huge range of technologies. Development of room temperature carbon magnets containing exclusively sp orbitals is viewed as great challenge in chemistry, physics, spintronics and materials science. Here we describe a series of room temperature organic magnets prepared by a simple and controllable route based on the substitution of fluorine atoms in fluorographene with hydroxyl groups. Depending on the chemical composition (an F/OH ratio) and sp(3) coverage, these new graphene derivatives show room temperature antiferromagnetic ordering, which has never been observed for any sp-based materials. Such 2D magnets undergo a transition to a ferromagnetic state at low temperatures, showing an extraordinarily high magnetic moment. The developed theoretical model addresses the origin of the room temperature magnetism in terms of sp(2)-conjugated diradical motifs embedded in an sp3 matrix and superexchange interactions via -OH functionalization.
Tucek J., Hola K., Bourlinos A.B., Blonski P., Bakandritsos A., Ugolotti J., Dubecky M., Karlicky F., Ranc V., Cepe K., Otyepka M., Zboril R.:"Room temperature organic magnets derived from sp3 functionalized graphene," NATURE COMMUNICATIONS, vol. 8, p. 14525, 2017. IF = 12.124 WP5